i will try one more time

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rick sterling - 30 Apr 2009 21:10 GMT

hello my question that i ask acouple of times is ,,what prop should i
use for a ,30in -32in,36in, 38in,or a 40in,i am just trying to figure
out what size prop goes to what length boat can anybody help me thanks
rick,,is there a chart to help you figure ot the right size prop to the
boat size ?? rick

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rick sterling
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John - 01 May 2009 05:21 GMT

I wish I could help Rick but I only have an idea on Gas boats with
23-26cc engines. Even with those it sometimes takes a lot of trial and
error to work out the best prop.

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John
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BigRiver - 01 May 2009 13:02 GMT

;).. Laws apply here so:- probably a mix of the relationship between
*Drag* (boat design/draft/mass) & *Torque* (motorsize/gearing) & *Prop*
(blade shape/number/angle).

A powerful motor, fast running with a 'coarse' helix prop will
cavitate... everything the same -'shallow'- helix prop would be fine

_all_above_ SLOW running >> 'coarse' helix will be fine...

FYI here, in Newcastle upon Tyne, we have the *Turbinia*, built as the
first Steam Turbine powered boat _ever_... Armstrong (designer/builder)
didn't know what prop would work either!.. LoL (he built numerous scale
models... but then, he had a huge Armaments factory, probably got
someone else to make them ;<)

If yrr not gettin' anywhere... try other R/C boat Forums.

Everyone has 2cents worth.. *even me*.. &I don't have a BOAT..

:cool:

*BigRiver*

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BigRiver
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Model Forum / Radio Controlled / Water Models / May 2009

i will try one more time