it started dropping about 5 hp per hundred rpm,only pulled it to 6100 because were going to prop it to max at 6000.

Are you sure you have the right sheet? Mine shows HP climbing from 3000-5900. At 5900 and 6000 it stopped climbing but stayed the same number. No drop in HP on my sheet? Torque started falling off slightly after 5600

What speed was he running in the previous tests?

In general it is more efficient to turn a big prop slower than a smaller pitch prop faster. Typically you switch from 1.5 to 1.36 gears when you run out of props (pitch maxed out).

At the speeds I'm guestimating he's running a 40 hp on the top end will be negligible simply due to drag rise. It may come down to more of a handling issue at those speeds and with that pitch.

I don't think it will be a monster. If he wants a monster accelerator keep 1.5 gears and throw on some 28" wheels.

See from what everybody is telling me, they have gone from the 1.5 ratio to the 1.36 that they loose almost all acceleration and it takes forever to get to their top end. From what I have been learning and reading, as long as I dont go over a 36 pitch prop that the 1.5 ratio is more efficient, better accelleration and top end. Has anybody done this and proved this theory if so, please respond.

I agree with you being easier on the drives (strain wise) but one of the biggest factors for killing drives is generating heat as well. Since the 1.36 is spinning faster than the 1.5, what about the extra heat thats being made? Wont that or will that contribute to premature bearing wear?

Where is Riverrat when you need him,,i bet he has it all figured out


And so all the confusion begin's!!!

This ......

That should cost him 3-5 mph..is he running the captivation plate extensions?

I'd be shooting for the -4 scx lower with #6 prop shafts!

I would have thought a 1.36 with lower pitch prop would accelerate marginally quicker than 1.5 with higher pitch. Due to the fact that the higher pitch prop is going to slip more and be less efficient until it reaches a certain speed. The lower pitch prop is more efficient at the lower speed (standing start and mid range). They may both even out at peak rpm as long as pitch selection is correct.
This is just my thoughts, I'm no prop guru.