higher rpm vs bigger prop

[jjrctech]

Is it better to run bigger props or smaller prop and higher Rpm for high speed runs???? I think a smaller prop setup would be better at speed higher then 60mph ?? wanted to ask before I test it out.

[obrien]

Depends on the hull and overall setup of the boat.

[jjrctech]

Small C5000 33"

[drwayne]

I ran 36" Maritimo twin @49k rpm unloaded
LR ABC1616/3 = 80+mph
LR X442 = ~74mph

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[Simon.O.]

There is a minimum dia prop for many hulls, I know as I have tried small props with insane rpm on many of my hulls and have varied success.
There comes a point when the prop is too small.
From here I go up in size with a X4 prop and then try the X6 props I have too. Then comes the rpm and I get to mix it all up with a combination of pitch and rpm.

fwiw my rebuilt rigger will run a lot of X4 props before the X6 ones go on, and consider this is running a 1600kv Outrunner on 6S. Minimum prop size for this hull is 437 or 637, either way it is 37mm.