
Nov 10, 2012, 02:53 PM  
Joined Oct 2004
3,007 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
6,580 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. 
Thread Tools  
Similar Threads  
Category  Thread  Thread Starter  Forum  Replies  Last Post 
Discussion  Calculate motor/rotor size against frame weight  tormodnt  Scratchbuilt Multirotors  2  Sep 02, 2012 05:07 PM 
Question  How much additional weight with FPV setup?  yomgui  FPV Talk  4  Jun 19, 2012 09:24 PM 
Discussion  how to calculate the flapping time constant of weighted flybar  huynhthien  Coaxial Helicopters  0  Nov 12, 2008 02:07 AM 
How to mount Lipol for weight balance AND protection  ukgroucho  Micro Helis  6  Oct 01, 2004 02:54 AM 