CG for Biplane and more control sensitivity

[Dean Pappas]

Hi Paul, 
It's the wing area weighted average of the 25% (or whatever) MAC of each wing.
If the areas are equal, it is centered between the 25% MAC of the bottom and the 25% MAC of the top. 
If the top wing has, say, double the area of the bottom wing, then it's 2/3 of the way from the 25% MAC of the bottom to the 25% MAC of the top.
 
While I am here: did the throw reduction fix your sensitivity problem?
One other variable is hingeline shape. If the leading edges of the the ailerons protrude above the wing surface this can cause all sorts of issues.
It wasn't likely, so I didn't bother to chime in, before.
later,
Dean
 
 

Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of paul
Sent: Thursday, December 08, 2005 4:00 PM
To: discussion at nsrca.org
Subject: CG for Biplane


    Anyone know how the calculate the CG for a Biplane ?  I expect it is 25-30% of the MAC; but, how do I calculate the MAC for a biplane ?
Thanks,
Paul

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