

Nov 10, 2012, 02:53 PM  
Joined Oct 2004
2,916 Posts

I think that in first approximation you can just consider it as a lever with the fulcrum on the prop hub, so the formula here would apply: http://en.wikipedia.org/wiki/File:Le...inciple_3D.png
the problem is that you would at least need to know where the CG of that single blade is in order to calculate the length of its lever arm 
Nov 10, 2012, 03:41 PM  
Denver, CO
Joined Dec 2005
6,466 Posts

For the above formula to work at varied rpm, the CG of the blade, and counter balance would have to be the same distance from center.
Here are some formula's http://www.iitg.ernet.in/engfac/rtiw.../rtiwari04.pdf To simplify it is balanced like any other rotor. The CG, and weight on each side must match to balance over a varied rpm. To acheive that with having the cg close to center usually requires, adding weight inboard on the rotor blade side. 
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