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[ttony47]

im building the sg&k gentlemens run about any guidance in which propeller i should be using  , 2 blade / 3 blade ,width of  blade ? .any advice gratfully recived                                  tony

[Martin (Admin)]

Boat size?
Motor size?
Battery voltage?

[ttony47]

Hello, thank you for your speedy response ,im using a 570 s motor ,boat length 85cm  , battery will be  7.2 volts .is this sufficiant information
    tony

[ttony47]

Sorry there is a correction the motor is a 750s   as stated  not 570  the power train is intended to be , a750s motor from cem ,the boat lenght is  85cm , with a 7.2 battry

[Martin (Admin)]

Wild guess, 35, 40, 45 mm.
Buy a few cheap plastic ones and try them out.... 'suck it a see' as they say.

[malcolmfrary]

There might be a problem actually fitting a 750 size motor into a 22" hull.  A Speed 400 (or a 380) rated for 7.2 volts might be more appropriate, 2 blade prop, about 25mm.

[chas]

Malcolm, am I missing something, surely 85cm is around 33 inches, a bit big for a 380?. Or am I having another senior moment!
 Chas

[canabus]

I am installing a 3639-1100kv (35mm) brushless motor, ESC 60 Amp, 40- 42mm 2 blade prop and a 11.1 volt (3S) 3700mah Lipo Battery in my SG & K 1920 Gentleman's Runabout.
One thing is I am moving the motor to under the dash between the driver and passengers feet.

Canabus

[malcolmfrary]

Malcolm, am I missing something, surely 85cm is around 33 inches, a bit big for a 380?. Or am I having another senior moment!
 Chas

I just googled the description - 22" is what came up, I didn't do the mental arithmetic (too early). 
A 385 on a lot less than its rated voltage propels a Snowberry (about 33" long) very respectably.  A 380 on its rated voltage with the right prop should do the same if it is the same shape as in the pictures that came up.

[ttony47]

Well parts now ordered for better or worse ,if they dont fit  - wellll they will fit for better or worse .Despatched yesterday from cornwall  ,cant wait to glue me fingers together again , im sure il be back for more advice from you fine fellows, bfn tony