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Question:
I have a light tunnel with a slightly modified 50 cu in stinger. I am running a 11 3/4" X 23" cleaver 3 blade. I am only getting 72 mph gps at 7200 rpm's..this calculates out to roughly 15% slip. I am surprised the slip is that high. Is my issue the small diameter I have? A good 12-12 1/2 X 23 is hard to come by it would seem. Any thoughts??? Thanks.
George,Quote:
Originally Posted by marchettih2o
Personally, for your set up 7200 RPM's a bit high. If you were running it with a short tower on a hydro withe the right prop, 7200 would be OK. But wou definitely need to bring the RPM's down. You can try larger diameter, but same approximate diameter & a bit more pitch would have similar results.
John
Are you running the nitro gearcase or the big one? That would change things a lot.
The slip factor number may also be an indication that the marked pitch is not accurate
If the boat runs the same slip factor with every prop, I'd say the slip factor is accurate. If it varies, I'd suspect the inaccuracy in the marked pitch esp if just one prop varies.
What slip factor do you get with other props?
Which case would benefit him the small one or the larger one? what r the ratios?
:cool:
we run a nitro, 1.86-1 gears. on a 13ft mono 12x23 @6500rpm thats 75mph.
the larger box is 2.4-1
smaller box is better. you can put 2.4-1 gears in the nitro :eek:
I agree, I have a prop that is stamped 26p, on the slip charts it is really a 27pQuote:
Originally Posted by Mark75H
I don't know, it would change the gear ratio that he is multiplying by is why I asked.Quote:
Originally Posted by Billsboats
I second that, what would be the best slip ratio for a cleaver?
People tell me that my slip is wrong, don't know, don't care 6900rpm 26p 77- 78 mph. 2.0gear