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>> Home > Forum > Any Other Questions! > 3 blades v 2 blades on air boat
3 blades v 2 blades on air boat
(133 views)
Author Message
octman
(Commander)





Forum Posts: 84
23rd Jul 2017 12:46  
>> Permalink
mdlbt.com/31393

If I know that the size of the 2 blades prop is 9 x 6, how do I convert that to a 3 blade size? Is it the same pitch but the blade length is only two thirds as long as one of the 2 blade's blade? I know the result is only a starting point but we have to start somewhere.


Chris

Haverlock
(Fleet Admiral!)





Forum Posts: 386
25th Jul 2017 20:53  
>> Permalink
mdlbt.com/31448

if your using electric power its a case of matching rpm to watts. It is quite normal to use 3 bladed prop of the same diameter and pitch as a 2 bladed prop on the same model.

The increase of blade area results in increased thrust with an obvious increase in current used.

So for any given system its a case of matching motor revs/current/battery life to the motor parameters.


"that's not a bug its just an undocumented creature."

Sir Terence David John "Terry" Pratchett, OBE (28 April 1948 - 12 March 2015)