Re: i will try one more time

[rick sterling]

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


--
rick sterling
------------------------------------------------------------------------
rick sterling's Profile: http://www.modelpowerboat.com/forum/member.php?userid=7110
View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=1223
Free RC Model Boat Plans: http:\/\/www.modelpowerboat.com\/forum\/downloads.htm

[John]

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.


--
John
------------------------------------------------------------------------
John's Profile: http://www.modelpowerboat.com/forum/member.php?userid=2
View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=1223
Free RC Model Boat Plans: http:\/\/www.modelpowerboat.com\/forum\/downloads.htm

[BigRiver]

;).. 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*


--
BigRiver
------------------------------------------------------------------------
BigRiver's Profile: http://www.modelpowerboat.com/forum/member.php?userid=7807
View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=1223
Free RC Model Boat Plans: http:\/\/www.modelpowerboat.com\/forum\/downloads.htm