building a hull without plans

[maggotman]

i have seen boats built guys cutting the parts by hand skill saw etc how are pepole marking out the curves for the fron section the rear 2/3 of the boat is simple just straight lines angles etc

[mohawk]

make a cardborad or paper model , when your happy draw a grid on it and scale it up... eeezy peeezy

[maggotman]

this is what i have been doing it all goes well till i get to the front i am looking to put a diesel engine in along with a pp65 jet unit i have a dateline jet boat that is 4.6m long an curently getting 30 to 40mph depending on load  i am have had enough repairing the fiberglass from rocks etc the engine only needs 800mm from the transom as the pump hangs out the back i am thinking 3.4 metres long with a shallow deadrize i expect the engine and pump to be around the 180kg mark ?

[LBD]

Not pretty... completely different... never been done before... and lofted up in my minds eye....

http://www.nzjetboating.com/yabbse/index.php?topic=29895.0

So you can do it or you could say, "if that is the outcome, then I think I may need to invest in a set of plans....."

[maggotman]

i think i am better off investing in plans looking at that its anot its just the front part i cant get right trying to work out the dimentions of he reverse chine up to the bow are next to imposible on paper / card i want somting like a 80mm reverse chine but scaling it on paper is like 8mm

[Jeff B]

You don't have to scale it at 10:1? I know of people making full size models from MDF.
I have built a heap of boats without plans, scale models, straight edges, laser levels are all used.
It takes a heap of time.