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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
(209 views)
Author Message
octman
(Captain)





Forum Posts: 97
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: 403
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)
onetenor
(Fleet Admiral!)





Forum Posts: 167
16th Oct 2017 13:17  
>> Permalink
mdlbt.com/34549

It's really a case of suck it and see .Experiment is my mantra for stuff like this.Just try it and see what the results are. You could ask the aero bods on say Aeromodeller or RCME ( Flying Models ) forums of a number of others.👍

Haverlock
(Fleet Admiral!)





Forum Posts: 403
16th Oct 2017 15:12  
>> Permalink
mdlbt.com/34558

get a watt meter they are cheap and you can read the current drawn at full revs ( although its not moving) this will give you an idea as to the run time of your battery and the capability of your ESC to handle the load. I think every one who uses electric motors and especially lipo batteries should have one!


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

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