Impeller comparisons Hamilton versus Kawasaki Jetski

[Karl]

Was interested to see how the impeller power demand would compare for different sized pumps.

[Matthewf/Norbert/TuiDog]

great work  really interesting

I run white water at 3800-4100 with the 250 ultra blade, its using stuff all hp.

[Dicko]

Good info Karl, the 15f surprises me in white water, I reckon it handles it as well a a Hamilton single stage ,don't listen to Matt he's flat out and I'm right on his hammer.

[Karl]

Hey Dicko, is your boat a N/A 15f ~160hp?

[Matthewf/Norbert/TuiDog]

Good info Karl, the 15f surprises me in white water, I reckon it handles it as well a a Hamilton single stage ,don't listen to Matt he's flat out and I'm right on his hammer.

will have a video up in the morning of 4 kawasaki 15F and 15F S/C in aerated water

[Paul]

Karl, where did the numbers come from, or is it an rpm-cubed extrapolation once the blade KW rating is known?

[VidarXR]

+1 any chance of getting a 753 in there? Great work 

[Karl]

Karl, where did the numbers come from, or is it an rpm-cubed extrapolation once the blade KW rating is known?

Yep that is pretty much how i  produced these.

Worked backwards from the Kawasaki published maximum power/rpm values using the rpm cubed relationship.  I setup an excel ss with the rpm-cubed = power relationship and then adjust the impeller kW rating until the curve goes through the desired point i.e. 120hp/6750rpm. This method fits the Hamilton published curves bang-on.

[Dicko]

That's correct Karl

[Karl]

+1 any chance of getting a 753 in there? Great work 

Here we go

[VidarXR]

Thanks! 

[Spargs]

Good info and certainly interesting. Can someone tell me where nozzle size comes into the equation. It might be silly question, if so Im sorry but just trying to get a clearer understanding. eg for the 753 with medium pitch impellors revving out to specific revs for given power eg 250hp. Wont the revs achieved also vary based on the nozzle size youre running?
Steve.

[Brizz]

there are also other variables, eg impeller design, std impeller vs bullet, vs 3 blade etc.  Eg I'm running a flopro 3 blade up front, std rear, and 112mm hole, no slip even with a grill full.

[Karl]

Good info and certainly interesting. Can someone tell me where nozzle size comes into the equation. It might be silly question, if so Im sorry but just trying to get a clearer understanding. eg for the 753 with medium pitch impellors revving out to specific revs for given power eg 250hp. Wont the revs achieved also vary based on the nozzle size youre running?
Steve.

Impeller pitch (for a given blade design) is the primary variable and the nozzle is secondary. The Hamilton installation instructions show the effect of nozzle size and it does shift the rpm curve up or down a bit but only + or -  a few hundred rpm.

[mohawk]

there are also other variables, eg impeller design, std impeller vs bullet, vs 3 blade etc.  Eg I'm running a flopro 3 blade up front, std rear, and 112mm hole, no slip even with a grill full.

your grill isn't full then is it