Can a spinning prop )too low( be corrected w/pressure in the nozzle?

Henry Stephen

Henry Stephen

I want to experiment with a low pitched prop and increase the pressure in the reduction nozzle, and cone.

On the Solas 144mm, 15/20-16/21 C75 is probably the correct pitch, for my TPE 964.

In a thread (experienced freestyler) had mentioned "start with a low pitch", this is different from the pitching numbers advice from the TPE crowd.

Which got me thinking (sometimes dangerous), can the spinning be controlled?
 
Henry Stephen

Henry Stephen

Right, the 15/20 can be tweeked to get it right w/ a 85.5 taper nozzle, but I do want to try a 13/18 w/ a 82.5 and the larger cone.
This 13/18 prop was spinning before, so if the pressure is increased, it may not spin? Waiting for some parts to come in, and try this...

The XS cones are good for trying combinations.
 
xXx Octane xXx

xXx Octane xXx

X
Location
Minnesota
Unfortunately I don't think that 144mm 13/18 is going to stand a chance with the TPE 964cc in front of it. You could try machining an insert with a ~76mm or smaller I.D. for your reduction nozzle to try to get that prop to bite but you will be trading low end response for higher peak water speeds with the smaller nozzle.
 
Henry Stephen

Henry Stephen

@Octane That's the answer, thx, the pressure could be there, with a smaller nozzle, but that won't get a low end response....
Thought the low number pitch, could be compensated for through the nozzle. Now, I know why not.
 
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