Colin, you indicated that you used the firewall as a datum and that your
mains were 15" aft of the firewall. This puts your mains approx 8" in front
of the front face of the forward spar assuming a distance of approx 23" from
firewall to the front face of the front spar as called for in the plans. Did
you make these weights and measurements with the aircraft level? Mains that
far forward seam somewhat excessive??
Mike Turner
----- Original Message -----
From: "Colin" <crain...@cfl.rr.com>
To: <kr...@mylist.net>
Sent: Friday, May 16, 2003 8:25 AM
Subject: KR>CG
Dan asked me to describe my installation for interpolation by others.
It is an 1835 VW with large jugs, Dan Diehl case and accessory drive,
Zenith carb, direct drive, 52" Culver Prop, and standard engine mounts with
1 inch extensions. I measured from the firewall to the middle of the engine
to assign its moment, hence the negative number due to moving forward. I
used this method after the way Cessna assigns their arm/moment in their
POHs. I whole heartedly agree with both Larry and Mark, would remark that
this is a strictly simplified illustration using the basic weight and
balance formula. What I would recommend to anyone desiring to move the
engine forward is to make extensions and mock up the results without the
cowling and weigh the results. With Great Plains recommending 3 inches
forward to restore a CG, it seems reasonable for light weight engine
installs to need nearly 3 -4 to stay on the forward side. Once I get mine
actually in the air flying, I will experiment with this and post the
results.
Colin Rainey KR2(td)
crain...@cfl.rr.com
Sanford, Florida
FLY SAFE!!!!_______________________________________________
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