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From: gchoi2@webtv.net
Date: Sun, 8 Apr 2001 13:33:27 -0400 (EDT)
To: lancair.list@olsusa.com
Subject: Re: LNC2 C of G limits
Message-ID: <26328-3AD0A0E7-418@storefull-615.iap.bryant.webtv.net>
In-Reply-To: "Ian B. Crowe" <ian.crowe@sympatico.ca>'s message of Sun, 8 Apr 2001 11:24:33 -0400
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Reply-To: lancair.list@olsusa.com

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>
Yes Ian I can see whereYou can be confused
because in the thread no one has defined  the mean aerodynamic
chord,MAC.
In the simplified case of a rectangular wing such as a pre-1969 Piper
Cherokee the MAC
could be approximated as the chord length
most any where along the wing;however ,with 
a tapered wing You can graphically locate the position of the MAC by
drawing diagonals from the corners of the tip rib to the root rib.
Where the diagonals cross ,draw a line perpendicular to the spar.
This chord line then approximates the MAC.
Let's assume this chord line was 30"
11% of 30" would give You 3.3" back from the leading edge as Your most
forward C.G. limit.
29% of 30" would give You 8.7" back from the leading edge as Your most
rearward C.G. limit.
A mathematical way of determining the length of the MAC would be to
divide the wing area by the wingspan.  
If You drew lines parallel to the spar from the 3.3" and 8.7" points to
the wing root You would then have Your allowable C.G. range.
Measuring the distance of these 2 points to some convenient reference
point such as the firewall would give You a repeatable check on Your
C.G.

George Choi
27368 Royalton Road
Columbia Station,Ohio 44028
440-236-8800

Have a good day

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>