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nzjetboating.com Forums => Tech Library => Hulls => Topic started by: Lurvio on June 07, 2013, 08:06:25 AM

Title: Designing a jetboat with DelftShip
Post by: Lurvio on June 07, 2013, 08:06:25 AM
This guide has been in my head for some time now and I finally got around to actually making it. DelftShip (formerly FreeShip) is a free software for hull design and basic hydrodynamics.

The software.
(http://lurvio.net/forumpics9/Tutorial/Image00.jpg)

On Home-leaf, are most of the controls needed for basic design,
 - Project section has Project settings where you can edit the data given when starting a new model.
 - Edit section has reversing button that saves you many times when you screw something up. :P
 - Layer sections has buttons to add and delete layers, a selector to which layer the new planes (e.g. extruding) are added and the layer properties window (more on that later).
 - Point section has useful tools like Align points (becomes familiar with this guide) and some intersection tools that are helpful in the later stages of design.
 - Edge section has the extruding tools, Split edge to add a point to an edge, Crease tool etc.
 - Face section has tools to creating faces, mostly used to fill holes
 - Hull display has the options to what is shown on the model (control net, intersections, hull data, etc.)
 - View section has the perspective setting and view modes (editing in wireframe only)

On Tools-leaf are additional tools, Move tool is most useful in basic design.

At the bottom there is Incr. distance with a value behind it. By clickin on top of it a dialog is opened, I changed the value to 0.010 (1 cm). This value defines how much a point is moved when the arrow buttons are used on the dialog that opens when a point is selected.

Mouse controls
 - left button down selects an area to zoom to
 - right button down moves the model in the window
 - scroll works as a zoom
 - ctrl (on keyboard) and left button down, from left to right selects points and edges that are fully inside the selection, from right to left selects points and edges that are at least partially in the selection

Keyboard controls
 - ctrl + a zooms to extends
 - ctrl + z reverses the screw ups.
 - esc deselects everything
 - ctrl down points can be selected and deselected one by one with the mouse. Multiple (like the whole chine) edges can be selected.

With these we are ready to start a model.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 07, 2013, 09:11:56 AM
The hull created in this tutorial is basically a bigger version of the boat I am building so the shape is what pleases my eye. This tutorial should give you readers enough skill to create any hull shape that happens to work for your needs.

Starting a new model shows this dialog.
(http://lurvio.net/forumpics9/Tutorial/Image01.jpg)

I only edited the length and beam as the rest are not important. The result is something like this.
(http://lurvio.net/forumpics9/Tutorial/Image02.jpg)

Now select these three points and create a new face.
(http://lurvio.net/forumpics9/Tutorial/Image03.jpg)

Then we select and remove everything else.
(http://lurvio.net/forumpics9/Tutorial/Image04.jpg)

And we have a starting point for a transom, the first point is moved to origo (zero on all axis) and will be the centerline at the bottom of the transom.
(http://lurvio.net/forumpics9/Tutorial/Image05.jpg)

Next point is the outer edge of delta at transom. Delta will be 30 cm wide at transom.
(http://lurvio.net/forumpics9/Tutorial/Image06.jpg)

The last point is a bit trickier as it defines the deadrise of the hull we're creating. 65 cm width and 16 cm height means a deadrise of 14 degrees.
(http://lurvio.net/forumpics9/Tutorial/Image07.jpg)

I split the top edge and moved the new point to centerline and upwards.
(http://lurvio.net/forumpics9/Tutorial/Image08.jpg)

Now we start with the bottom. Select an edge to extrude. I have a hull length 3,6 meters so it is easy to devide by six. The delta is half the length so three sections, 5 cm closer to centerline with every section.
(http://lurvio.net/forumpics9/Tutorial/Image09.jpg)

(http://lurvio.net/forumpics9/Tutorial/Image10.jpg)

Now we create the delta (new plane). The points need to be selected in order for this to work. A new layer can and should be created before taking this step. In fact all the plates of the hull should be on separate layers.
(http://lurvio.net/forumpics9/Tutorial/Image11.jpg)

Here with two points (edge split) and edges added. The control net works best when every point has four edges connected to it (three on open edges and centerline).
(http://lurvio.net/forumpics9/Tutorial/Image12.jpg)
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 07, 2013, 09:14:00 AM
Then the rest of the bottom is extruded.
(http://lurvio.net/forumpics9/Tutorial/Image13.jpg)

At this point we have a flat plate so the bow needs to be shaped. The Move tool (Tools-leaf) is best for this so the bottom shape stays constant. Here the front is moved up 45 cm.
(http://lurvio.net/forumpics9/Tutorial/Image14.jpg)

Getting the shape aft of the bow to look nice takes a few tries/moves. The tip of the delta is a problem as there is an extra edge connected to that point and it causes a sharp bend to the keel line in the drawing. This bend (transition from flat (delta) area to the twisted bow area) should be kept small  to ensure the plates fit together. There are tools to check for this, but more on them later on.
(http://lurvio.net/forumpics9/Tutorial/Image15.jpg)

Next step is to select all the edges between delta/centerline and chine and split them to get extra points. I added new edges (if the edges were selected in order it is easy add the longitudal edge as the points are selected automatically after their creation) but this is not mandatory as these points are only used for reference.
(http://lurvio.net/forumpics9/Tutorial/Image16.jpg)

Now we start the actual design process by shaping the chine. I started by moving the transom-chine corner 5 cm inwards.
(http://lurvio.net/forumpics9/Tutorial/Image17.jpg)

To shape the chine I use the top-view and move the points only on Y-axis (transverse) until I have the shape I want. This is going to be a blunt nose design so the bow end is not sharp.
(http://lurvio.net/forumpics9/Tutorial/Image20.jpg)

Moving the points causes the bottom shape to change so that has to be fixed. The Align points tools works wonders here, but the points need to be selected in right order for this to work. In the image the left point (by the delta) is selected first, then the right (chine) point and last is the center point.
(http://lurvio.net/forumpics9/Tutorial/Image18.jpg)

Aligning can be done on all axis at once or only on one and as the point is already positioned on longitudal and tranverse, only the height needs to be fixed.
(http://lurvio.net/forumpics9/Tutorial/Image19.jpg)

The rest of the chine points need to be aligned one by one.
(http://lurvio.net/forumpics9/Tutorial/Image21.jpg)

Here is the finished bottom plate
(http://lurvio.net/forumpics9/Tutorial/Image22.jpg)
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 07, 2013, 09:15:25 AM
Next comes the side plate. Select the chine edge and extrude upwards and out. I extruded 40 cm up and 7 cm out.
(http://lurvio.net/forumpics9/Tutorial/Image23.jpg)

Then we repeat the process just like the bottom. Add the extra points (and edges) and in side view shape the lower sheer line.
(http://lurvio.net/forumpics9/Tutorial/Image24.jpg)

The fairing process is the same except it's done on (transverse) Y-axis.
(http://lurvio.net/forumpics9/Tutorial/Image25.jpg)

Just a quick peek of what we got so far in Shade-mode
(http://lurvio.net/forumpics9/Tutorial/Image26.jpg)

Next we extrude the deck corner plate. I use the same distance on both Y- and Z-axis, the former being a negative value. Here the reference points are removed. If the extra longitudal edge was added it is now easy to select that and hit Edge collapse. Usually all the control points get removed automatically with the edge.
(http://lurvio.net/forumpics9/Tutorial/Image28.jpg)

I edit the height of the corner plate in perspective mode by simply moving the points on both axis the same amount so the angle stays the same.

Here is one way of making the corner plate to the transom, by extruding inboard some amount (20 cm on my case) and the selecting the new points and changing their Y-axis value to zero.
(http://lurvio.net/forumpics9/Tutorial/Image29.jpg)

Here is the corner plate finished and the transom ready (add plane to fill the holes. The corner plate at transom should be on same layer with the transom plate to save on welding there.
(http://lurvio.net/forumpics9/Tutorial/Image30.jpg)

Then we extrude the deck plate. This is simple as most of the upper sheer (except one section aft is left of) is extruded inboard by some amount (40 cm).
(http://lurvio.net/forumpics9/Tutorial/Image31.jpg)

And the new points selected and moved to zero on Y-axis.
(http://lurvio.net/forumpics9/Tutorial/Image32.jpg)

After filling the hole aft we have our deck plate.
(http://lurvio.net/forumpics9/Tutorial/Image33.jpg)

Add a new plane to the nose. I split the vertical centerline twice and moved those points to same heights with the points on chine and lower sheer. Two edges are added as folding lines (they need to be creased).
(http://lurvio.net/forumpics9/Tutorial/Image34.jpg)

Then the forward edge of the deck is moved aft to form the last corner (or chamfer). The keel line front point is moved aft and down to finish the nose plate. To be totally accurate (with the bottom shape) a Plane intersection can be made a few cm (6cm on this model) behind the front of the hull and make the bottom part of the nose to that point, but eyeballing is usually accurate enough. Here is a wireframe of the hull with stations (in Intersections-window) added every 60 cm.
(http://lurvio.net/forumpics9/Tutorial/Image35.jpg)

Here is the hull in Developability check view. The plates are all green in the middle so everything is fine there. Red corners mean they need to be welded, green corners can be folded.
(http://lurvio.net/forumpics9/Tutorial/Image36.jpg)

If you flip the hull and look at the bottom, there is probably a lot of red in the bottom plate at the forward end of the delta. That is caused by the fourth edge connected to that control point as explained earlier. The other views can be used to check the model, especially the Environmental mapping mode with Metal selected as background (click right mouse button - Mode - Environment map). If there are no twists in the reflection the model should be fine to continue.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 07, 2013, 09:16:10 AM
So, how do we get the model to become a reality? Go to Tools-leaf and hit Unfold (was plate developments in earlier versions). The result is probably something like this.
(http://lurvio.net/forumpics9/Tutorial/Image37.jpg)

There are a couple of plates that look fine but most are twisted out of whack. That is because a wrong layer was selected for some of the steps earlier.  The layer window looks like this.
(http://lurvio.net/forumpics9/Tutorial/Image38.jpg)

I am missing two layers altogether and none are named, so I fixed that.
(http://lurvio.net/forumpics9/Tutorial/Image39.jpg)

::edit::
heemi.v8 deserves a thank you for pointing out this feature of the program. :)

So to get all the faces on the model changed to the right layer, hit interior edges button on Hull display tools. Here I have coloured all the layers different for better visualization.
(http://lurvio.net/forumpics9/Tutorial/Image40.jpg)

Now we can select one or more of the faces. The stubs that appear on all the intersections of the interior edges show which side of the face the plate thickness is meant to be on. It is safer to have all the normals (as they are called in the program) pointing outward. 
(http://lurvio.net/forumpics9/Tutorial/Image41.jpg)

When the faces are selected, you go to the layer selector (the drop down menu) and select the layer you want the faces to be moved to.
(http://lurvio.net/forumpics9/Tutorial/Image42.jpg)

After all the faces are in the right layers the result should look like this.
(http://lurvio.net/forumpics9/Tutorial/Image47.jpg)

Finally we have usable coordinates that can be used to cut our aluminium. The negative latter values can be used as positive ones if they are all negative, the plate will show upside down.
(http://lurvio.net/forumpics9/Tutorial/Image48.jpg)

If you have the plate at hand you can use the coordinates and measure them straight to the plate and draw cutting lines between them. Or write the coordinates on paper and draw them on a 2D cad software (I have TurboCad) and send the files to be cut on a machine. The old FreeShip versions had the ability export the cut files straight to .dxf files, but it is since reserved for the commercial version of the software.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 09, 2013, 00:20:50 AM
There are a couple of ways to create bulkheads. Easiest way is to open the Intersections-window (Tools-leaf) and Stations. Remove all the stations from the list and then create a new one to where the bulkhead is wanted.
(http://lurvio.net/forumpics9/Tutorial/Image49.jpg)

If the new station does not show up, hit Stations button on Hull display. With the station visible got to File-leaf - Export - DXF Polylines
(http://lurvio.net/forumpics9/Tutorial/Image50.jpg)

In the dialog select the file location and set the export unit to millimeters. 
(http://lurvio.net/forumpics9/Tutorial/Image51.jpg)

The file should look like this. Check the scale. If the export unit was meters the drawing will be one thousandth scale. Mirror the line to get the full bulkhead.
(http://lurvio.net/forumpics9/Tutorial/Image52.jpg)

Another way is to use the Plane intersection tool.
(http://lurvio.net/forumpics9/Tutorial/Image53.jpg)

New edges are created into the control net.
(http://lurvio.net/forumpics9/Tutorial/Image54.jpg)

Now the new points can be selected and a new face created. This can only be used on fairly straight hull sections, not on the forward half of the hull. The green line needs to be creased.
(http://lurvio.net/forumpics9/Tutorial/Image55.jpg)

Reflection shows a straight hull, good so far.
(http://lurvio.net/forumpics9/Tutorial/Image56.jpg)

Stringers and other inner structures can also be made by extruding. Start on the centerline of bottom/delta and extrude downwards, then adjust all the points to the same height. Then extrude outboard to where the stringer is needed (20 cm off centerline), then up to the top of the stringer (15 cm above delta) and finally ourboard (5 cm) to create the top of the stringer.
(http://lurvio.net/forumpics9/Tutorial/Image57.jpg)

Then use the Intersect layers-tool to cut away the part under the bottom. This tool is a bit fiddly to work with so be patient.
(http://lurvio.net/forumpics9/Tutorial/Image58.jpg)

Two stringers ready.
(http://lurvio.net/forumpics9/Tutorial/Image59.jpg)

And a view of the bottom with the stringers.
(http://lurvio.net/forumpics9/Tutorial/Image60.jpg)
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 09, 2013, 00:21:41 AM
So, we have a hull drawn up. Does it float? Does it float the right side up? How much load can it hold?

Here is the hull with a waterline at 20 cm above delta.
(http://lurvio.net/forumpics9/Tutorial/Image61.jpg)

Here is the layer window. There are some settings that affect the data the program can give out. A selection on Hydrostatics means that the layer is used in the calculations. Layers that have inner structures (stringers, bulkheads etc.) have to be ticked off. Developable option can be used when using Unfold-tool. It is easier to pick the coordinates with only one plate unfolded at a time. Then comes the important part, density and thickness. Density is easy, aluminium weights about 2,7 kg/dm3. The plate thickness is something that depends on a lot of things. There is a lot of experience (trial and error) based guestimates around on what thickness works for each part of the hull. In the image are my guestimates for the hull.
(http://lurvio.net/forumpics9/Tutorial/Image62.jpg)

Project settings. Changing the Draught value can be used to find how much load the hull can hold at a specified immersion.
(http://lurvio.net/forumpics9/Tutorial/Image63.jpg)

Project settings. These values/selections should give pretty accurate data. Water density is changed to fresh water.
(http://lurvio.net/forumpics9/Tutorial/Image64.jpg)

Here is the Hydrostatics report. There are a few values of interest. Displacement is probably the most important, Longitudal center of buoyancy is the other. LCB alone does not tell that much but when compared to Longitudal center of gravity (at bottom of the page), we can start estimating how the hull would float. In this model the LCB value is 1,188 and LCG is 1,460, i.e. the boat is nose heavy. This is just an example and doesn't have much value when thinking about the finished boat. To get a usable LCG value, at least most of the components (engine, pump, tanks, floors etc.) have to be placed in the model in correct places and weights. For example if you know the engine weight and center of mass you can add a sphere to the right location and then play with thickness and density values to get the weight right (no need to actually draw an engine like I did on my project).
(http://lurvio.net/forumpics9/Tutorial/Image65.jpg)
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 09, 2013, 00:30:38 AM
There is a lot of small tricks that can help in the actual building of the hull.

Aft end of the bottom plates (including delta) can be extented 10-20 mm. This will help with the welding of the transom to the bottom plates.

I had to take 4mm off the bottom of the bulkhead on my small jetboat. This was because I had an 8 mm delta and 4 mm bottom plates and I welded them with the outside being flush.


More will be added, when they come up. If you have tips that you've used, feel free to post (or PM) them and I'll add them here.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 10, 2013, 06:19:25 AM
For future updade
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on June 11, 2013, 18:05:59 PM
Layers are confusing the hell out of me!!!  I have been reading alot and messing around with the program alot but I am having no luck understanding how to make a new layer.  Can I assign one to a certain plane?  How do I see the different layers when I want to? 

After extruding the bottom out to where the delta pad ends you say "Now we create the delta (new plane). The points need to be selected in order for this to work. A new layer can and should be created before taking this step. In fact all the plates of the hull should be on separate layers."  But I dont see how to create a new layer.  Also what order do the points need to be selected in?

Just to be clear here are my questions:

Can I assign a layer to a certain plane? 

How do I see the different layers when I want to? 

I dont see how to create a new layer.

Also what order do the points need to be selected in?

Thanks for this great tutorial.  It is a whole different way of creating the hull than the other tutorial I read and seems much simpler and more applicable to our style boats.

Matt.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 12, 2013, 07:54:50 AM
MoabTuco

There are a couple of confusing mistakes on my part yet to be fixed. I have mixed plane and face in a couple of spots. In the quote you posted the text should be: Now we create the delta (new face). The points need to be selected in a clockwise or counterclockwise order around the perimeter where the new face is to be created. As for the layers, first you create a layer, it's as simple as clicking New layer-button. The Delete empty layers-button will become active as the layer is empty at this point.

In short, when a new face is created (created between selected points or extruded), it will be appointed to the layer selected in the dropdown menu.

You can edit the layers settings in the Layer dialog.
(http://lurvio.net/forumpics9/Tutorial/Image62.jpg)

Hope this helps and if not, ask away. :)

cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on June 12, 2013, 12:14:23 PM
So, can I move a face from one layer to another?

Or does the face need to be created while the layer that I want it in is in the drop down menu?

I would like to go back through my old model, that I didn't create any layers on, and assign the faces to different layers.

Thanks for all the help, Matt.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 12, 2013, 16:09:18 PM
::edit::
After a tip from heemi.v8 the guide was edited for a lot easier method of changing faces to different layers.

To my knowledge the only reliable way to change layer is to remove the face from the original layer and create again to the new layer. It is extra work, but easy if you have the points. If you have two plates that are on the same layer, but are not connected to each other, you don't necesarily need to separate them, you just cannot set different properties to them. 


cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 22, 2013, 14:49:37 PM
Hi Lurvio,
Thanks for the message. I have seen this topic and i like it thanks for putting it up. I actually learned a couple things from you :P I have a way to change layers easily. rather than try to explain i am working on making a video or two to show how its done. :)
Also they way you extrude the hull from the transom forward is quite smart would save a lot of time from the way i do it. What if you want to make a variable degree hull? this method wouldnt work right? i have a video that i may make about that too.
Jamie
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 22, 2013, 15:52:09 PM
here is the video. its still uploading but should be live soon. hope the quality is ok cos i didnt check it right through.

http://youtu.be/9wR2sXQFgmg (http://youtu.be/9wR2sXQFgmg)
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 23, 2013, 10:55:56 AM
Darn, that was easy.  >>@

cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 23, 2013, 13:52:52 PM
  *-) O))))
should save some time huh?
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 23, 2013, 21:04:08 PM
Regarding the variable deadrise hull, i don't see why this method could not be used. After creating the bottom the chine points can be moved around to add/reduce the deadrise.

Mohawk posted a very usefull link earlier that can be easily used to calculate the deadrise wanted.

Calculating deadrise (http://www.nzjetboating.com/yabbse/index.php?topic=22605.0)

Direct link to the calculator (http://www.carbidedepot.com/formulas-trigright.asp)


cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on June 28, 2013, 13:34:29 PM
Which dxf files do you send to the cutter?  There are 2D and 3D and mesh and poly lines?

Matt.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 28, 2013, 15:38:16 PM
go to unfold plates ( develop plates)

then got to export plates to dxf. they will be 2d
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on June 28, 2013, 16:21:57 PM
heemi.v8 seems to have the professional version (150€) which has the dxf export in Unfold window. Also some of the older Freeship had the export in the free version.

MoabTaco Those tools 2D/3D/mesh.. can be used to export the hull shape (bulkheads etc) but not the plates.


cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on June 28, 2013, 17:25:33 PM
Good news the version I have has the export .dxf files in the develope plates window.  This is great news.  Now I just need money for the material and cutting.

Matt.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 29, 2013, 15:46:50 PM
haha i must have been half asleep when i wrote that. sorry about that and thanks Lurvio for correcting me. if any one ever wants a file unfoled to dxf plates send em a pm and i can hopefully get it done for you.
Jamie
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on July 09, 2013, 00:12:16 AM
Press the control key...
Title: Re: Designing a jetboat with DelftShip
Post by: SIFTYISH on July 09, 2013, 20:29:13 PM
I was doing outstandingly well with the great tutorial       but realised my boat had some issues in the transom    I discovered it all happened in the beginning when I split the line to make two that go.... delta-top of transom-chine  ........ but mine turns into a control point for a silly curve instead everytime        what on earth do I do
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on July 10, 2013, 00:26:03 AM
In that little pop up box with the measurements tick the box that says corner. Do a google search for dealership tutorial. You will learn the basic functions that are not explained in lurvios tutorial. b>
Title: Re: Designing a jetboat with DelftShip
Post by: SIFTYISH on July 10, 2013, 18:17:09 PM
Awesome      thankyou       it looks kinda obvious now but I had no idea         
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on July 13, 2013, 08:25:30 AM
These questions are a good way to update and improve the tutorial. There is a lot of small things that get overlooked when one gets familiar with a program.


cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on October 29, 2013, 17:01:56 PM
i realised i had not uploaded these images which is how i fine tune my models for making them developable. the pictures might not explain it well enough.


next time i draw a boat i will video my screen through the whole way and then make a fast forwarded video. would be fun to watch and may help with some peoples projects.
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on October 31, 2013, 17:58:04 PM
When you develop your plates and the develop plate window is open how do you grab the plates to move them?  I can do it.  rarely when I am zoomed in and sometimes it takes 15-20 tries unzoomed.  Anybody have any tricks.  Special places to click.  A button to hold??

Thanks, Matt.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on November 01, 2013, 08:50:00 AM
The most stable way I've found is to select a piece from the right side menu and then try to grab the small point in the middle of the piece. Does not work every time.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on November 01, 2013, 15:44:24 PM
i dont have any problems jus right click once on the piece to select it then right click hold and drag. if this doesnt work it usually starts zooming instead so just repeat the process again and it should work....  i even went back to freeship tonight to make sure it worked the same lol
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on November 08, 2013, 16:35:30 PM
Still having problems moving the pieces on the development page but I think it might be just fiddly like a lot of things in the program. 

I am having problems figuring out how to make the stringers.  I can do the extrusion part and create what I want but I cant remove the extrusion and just leave the stringer.  I have made layers for the stringer and I can make a line linking the points in the bottom of the hull that stays where the extrusion was using the intersecting layers tool.  When I remove the extrusions all I can get to stay are the lines and points but I cant extrude from that line because it is in the middle of the face and not on an edge.  It also seems to change the bottom shape according to the developability check but I cant see the change just the red.

Any ideas?   Matt.
Title: Re: Designing a jetboat with DelftShip
Post by: BrokenRudder on November 14, 2013, 13:45:18 PM
Thanks SO much for the tutorial, it has been very helpful.  I have one issue with the stringer creation process...

I created stringers in the manner you explained and it works great, however it has created leak points.  Interestingly, it appears your stringers have the same leak points but I am not able to generate any hydro statics with the stringers in the model.  If you have any ideas on what I may have done wrong, I'd sure appreciate it.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on November 14, 2013, 14:07:50 PM
look back to reply number 6 its all written there with pictures. if you go to layer properties you can unselect the hydrostatics box on the stringer layer. then you should be golden
Title: Re: Designing a jetboat with DelftShip
Post by: BrokenRudder on November 14, 2013, 14:10:53 PM
I had that familiar feeling I was failing to grasp the obvious!  Thanks so much heemi.v8
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on November 22, 2013, 18:25:21 PM
moab

Are you mixing the layers in the layer intersect-tool? Insert points to the stringer-layer and find intersection with hull bottom-layer?

Try hiding one or the other of the layers to see what layer has your points.



cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on November 22, 2013, 18:53:32 PM
I will give it a try and let you know.

Thanks, matt
Title: Re: Designing a jetboat with DelftShip
Post by: snagtooth on March 29, 2014, 10:51:18 AM
Really struggling with the tools in Delfship. Newer free version and it's hard to find info on specifics with a google search.  Ive been trying to follow this tutorial but keep getting hung up on basics.  Is there a good guide to the tools anywhere online.  I feel stupid but I can't figure out for the life of me how to connect a line (centerline of delta) after I have extruded the bottom out.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on March 29, 2014, 15:24:31 PM
Im not sure i understood your question. But i made a bit of thing top maybe help you...

what you are looking at is the transom and then the start of a boat bottom. the three yellow points selected are where the delta should be but has not yet been created. All you need to do is select the points surrounding the area you want surface and click make new face (circled in green).

Also as far as online tutorials. there is the help icon in the top right which will be the manual specific to your version. other wise there is these for older versions...

freeship version 3.2  http://www.hapby.v-nam.net/FREEship/FREEship-Tutorial1.html

delftship on you tube  https://www.youtube.com/watch?v=r29xb8n6RlI

there was one on the delftship forum but they seem to have shut it down?
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on March 30, 2014, 08:28:45 AM
snagtooth

If you could post a screenshot of the problem, we can take a look and I can possibly update this tutorial.


cheers
Lurvio
Title: Re: Designing a jetboat with DelftShip
Post by: snagtooth on March 31, 2014, 12:45:48 PM
Still struggling with a few things.  Can't get some lines to "highlight" i guess you would call it and I think that is what is causing my "edge" issue.....screenshots.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on March 31, 2014, 15:32:36 PM
i have three things you need to do... heres the first one to answer your question


first two pictures i created your problem with my first hull design. third picture i selected the lines that were not "highlighted"

then i clicked the green button called set crease. basically all the red lines are hard bends. so the fourth pic is the result of hitting the set crease button.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on March 31, 2014, 15:56:44 PM
so here are the rest of the things i would fix.  first picture is my hull drawn in a similar fashion to yours. so first you need to set the delta line as a crease (second pic)

second you need to remove the creases going across your hull as you want the bottom of your boat smooth and curvy in this area no hard bends or creases. (third pic)

third you will get a more accurate unfold to flat panels if you remove the control points in the middle of your hull to do this simply select the line (fourth pic) and click edge collapse (highlighted in green)
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on March 31, 2014, 16:05:30 PM
it can take abit to wrap your head around at first but once you get it, it is very useful for all sorts of stuff. Some engineering students in the US have drawn from this program then printed in 3d a small model and put it in a wind tunnel to do some testing on it. It is also possible to use these files on a cnc router. then you can go full size. for example an intake pattern for casting or a steering nozzle. Many other options too not just boats.

your doing good all those who persevere with this program  b>
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on March 31, 2014, 16:09:19 PM
or you can draw in intake for fabricating from sheet metal

http://youtu.be/nElW6Q5qckg (http://youtu.be/nElW6Q5qckg)
Title: Re: Designing a jetboat with DelftShip
Post by: snagtooth on April 01, 2014, 07:45:50 AM
Awesome advise, thank you for all the pics and instruction.  I am working in the free version just learning it now. If I get to the point where I really get a design I want to build can my "free version" file be imported into a "paid version" for printing out panel specs?
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on April 01, 2014, 14:15:42 PM
yes i have the paid version.

your other option is to look online for a freeship v 3 download and then you can export to dxf for free. the software is a little more 'simple' but it still does the job.
Title: Re: Designing a jetboat with DelftShip
Post by: 00si2 on June 24, 2014, 14:35:23 PM
I having some problems with the developed plates when using Freeship.  The transom in particular.  The transition from the hull bottom to the chine should be a sharp corner but its adding on a weird radius.  Is this something I am doing wrong or does Freeship had difficulties with developing plates? The first picture is the overall transom, the second is zoomed in on the problem area and the third is the wireframe plan showing a sharp corner.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 24, 2014, 15:07:38 PM
the green dots indicate a leak point. they way i draw a boat those particular dots are yellow. i believe your transom is somehow a separate piece from the rest of your boat. if you can figure out how to join it to the rest you will most likely fix it. i can have a go at it for you and post pics of how i did it. i sent you my email address in a pm.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 26, 2014, 13:59:20 PM
there was something funny going on. i couldn't figure out what it was. so i deleted a bunch of stuff then redrew it. see pictures
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 26, 2014, 14:00:30 PM
.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 26, 2014, 14:01:14 PM
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Title: Re: Designing a jetboat with DelftShip
Post by: PM on June 26, 2014, 14:39:55 PM
You may wish to consider a small return fold on the underside of the coaming, this will add strength to the sides and remove a sharp edge to hit yourself on
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 26, 2014, 14:49:21 PM
yeah i would agree with that.

i also mean to mention i found some differences between all the different versions that are worth noting.

delftship home/pro- ability to subdivide control, copy values from one point to other(s), make a selection of points in a straight line on any given plane.

freeship plus 3.4- ability to find angles and distances between points inside the drawing. none of the other versions have this and would be very valuable tool. only problem with this version is it doesn't seem to allow other versions to open its files.

and freeship 2.6- ability to develop plates for free

if you don't want to spend money you should really look for version 3.4 its worth the extra google time
Title: Re: Designing a jetboat with DelftShip
Post by: Rob on June 26, 2014, 15:04:07 PM
if you don't want to spend money you should really look for version 3.4 its worth the extra google time
Is that one you can export to dxf for free.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on June 26, 2014, 15:06:23 PM
yes you can do it for free in 3.4 also. only thing is if you plan on sharing files use 2.6
Title: Re: Designing a jetboat with DelftShip
Post by: Rob on June 27, 2014, 14:48:28 PM
yes you can do it for free in 3.4 also. only thing is if you plan on sharing files use 2.6
Thanks
Title: Re: Designing a jetboat with DelftShip
Post by: 00si2 on June 28, 2014, 11:45:44 AM
yeah i would agree with that.

i also mean to mention i found some differences between all the different versions that are worth noting.

delftship home/pro- ability to subdivide control, copy values from one point to other(s), make a selection of points in a straight line on any given plane.

freeship plus 3.4- ability to find angles and distances between points inside the drawing. none of the other versions have this and would be very valuable tool. only problem with this version is it doesn't seem to allow other versions to open its files.

and freeship 2.6- ability to develop plates for free

if you don't want to spend money you should really look for version 3.4 its worth the extra google time

How are you finding the angles and distances drawing?  Ive been working in 2 separate programs to figure out the inputs needed to get my angles.
Title: Re: Designing a jetboat with DelftShip
Post by: 00si2 on June 28, 2014, 13:26:14 PM
I answered my own question.  By selecting 2 points the distance is displayed and x,y,z angles are given below the distance.
Title: Re: Designing a jetboat with DelftShip
Post by: 00si2 on July 03, 2014, 01:22:59 AM
I had a question about having pieces bent from the developed surfaces created from freeship or delft ship. 

I'm wanting to have my side pieces bent instead welding the individual pieces together. There will be 5 bends in total.  Do I need to add material to my developed pieces so I don't end up short from the bends using material the program doesn't calculate?
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on July 04, 2014, 13:21:35 PM
Lurvio actually covered this in post number 4 with pictures.


this is a walk through in version 3.4

select "show interior edges". what that does is show the actual shape of the boat. you can then select "show normals of selected control faces". then you can "flip direction of selected control faces". make sure the little nodes visible when a control face is selected are facing the outside of the boat. if they are not then flip the direction again. this is the most accurate way that i know of for allowing for bends in material.
Title: Re: Designing a jetboat with DelftShip
Post by: Lurvio on July 06, 2014, 19:00:13 PM
Not sure of the older versions, but the check model-tool is good at fixing the normals in an easy way. Then check to make sure everything is allright.

When you think about a bend versus a welded joint, there is very little difference in the plate area. In welding you butt the corners together and weldment fills the corner. In bending you have the same plate area on the inside (if you had the normals right), most of the bend forms by stretching of the plate and the inside bend radius covers the rest of the difference.


cheers
Lurvio
 
Title: Re: Designing a jetboat with DelftShip
Post by: jacknz123 on December 12, 2015, 13:34:12 PM
Hey guys,
Firstly thanks for creating this tutorial it has been super helpful. I have just finished drawing my first boat and am having issues with the DXF file of developed plates. I am finding that freeship is automatically scaling them to about 100mm long. Is there any setting to change to stop it doing this? Anyway here is my boat is 3.7m long and 1.32m at the transom chime with 14 degree deadrise.
Title: Re: Designing a jetboat with DelftShip
Post by: heemi.v8 on December 12, 2015, 15:14:27 PM
Hi Jack, looks good what you have there. Delftship and free ship output exactly as drawn. You can draw in meters or feet. No doubt you drew it in meters so the files will be in meters. If you want them to be in mm just scale the dxf file by 1000. I haven't found any other way to do it. When i open the dxf file the first thing i do is scale it to mm before editing or touching up

Sent from my SGH-I747M using Tapatalk

Title: Re: Designing a jetboat with DelftShip
Post by: Moab on July 23, 2016, 07:07:54 AM
Does anybody have a way to create a bulkhead or floor that intersects with the curved front section of a boat?  I can make stringers that cross through the straight sections but when I try to have them intersect with plates that curve I get very strange shaped curves. Like the images in post #41

I have been making a large plane/face at the height I want the floor to be and using the intersecting tool in the points drop down. It gives me points at the correct level but the curve is incorrect and unusable.

Matt
Title: Re: Designing a jetboat with DelftShip
Post by: Moab on July 24, 2016, 15:41:06 PM
I think I have figured out that I will need to upgrade to the delfship paid version to make this work.

Matt