Custom/Hybrid Tightening prop by cut back or repitch. Advantages to either?

Jcary85

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so I might tighten my prop up a bit. I can move it closer to the stator with more cutback (will throw it on the lathe) or I can repitch slightly. I know both methods can “tighten” a “loose” prop but there must be slightly different things that will happen between these two methods, right? I’m thinking more cut back is smarter (assuming I actually have the space to do it) since it also increases pump efficiency? Just a guess really.
Thanks!
-Jordan
 
You seem like a guy that likes to test, I think you should get one of these:


I really think it would be interesting to put a data logger that can record rpm and pump pressure on a ski. Plan to do exactly that this summer.

It's surprising to me that this isn't more common, or if people are doing it they don't talk about it much.
 
I have to make a midshaft dyno for jetskis, would give some real insight to the effects of pitch/cutback etc. I made them for car driveshafts but the project kinda got stagnant as other things took over. I have all the parts sitting on the shelf to throw one together...
 
Despite the side track I'm very interested in the original question. I'm going to wildly speculate that more setback will have more effect at lower rpm and less at high rpm, but I really have no idea and I'm hoping somebody will come along and have better info. Trying to use Cunningham's Law basically.
 

Jcary85

Site Supporter
Vendor Account
Location
Glenmoore pa
You seem like a guy that likes to test, I think you should get one of these:


I really think it would be interesting to put a data logger that can record rpm and pump pressure on a ski. Plan to do exactly that this summer.

It's surprising to me that this isn't more common, or if people are doing it they don't talk about it much.
Ha! I have a thread asking about this exact thing from like a year ago! Maybe some day I’ll get around to it
 
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