Tom,
If, at cruise, you saw the elevator horn much above its faired-in
position (down elevator, nose down trim, whatever) then the CG is too far
back and the negative lift (downward balancing force) on the
horizontal stab had to be reduced. I.E. You may not have enough forward CG
or the negative angle of incidence of the horizontal stab may not be
enough.
Remember, Lancair had a long engine mount to compensate for the
rearward CG moment caused by adding the big tail. If I remember
correctly, that moved the empty weight CG 1.5 inches forward with no difficulty
or even improved handling.
Rearward CG is bad even if it is within the design envelope. Forward
CG is bad if you can't flare the airplane when landing although raising the
flaps will raise the nose.
Your discomfort at slow flight should be a warning and, indeed, it may be
exacerbated by having a rearward CG. You really need to know
the CG values - such as when does the CG go out of the envelope with only fuel
in the header tank and a too light pilot..........
Good Luck,
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL
(KARR)
In a message dated 2/20/2009 12:51:25 P.M. Central Standard Time,
dudewanarace@yahoo.com writes:
Works great. I have a 400! I'm sure the rest of small
tail group would agree. Might have to move your center of gravity back.
(I need to) Only thing I can say is that slow flight with full flaps
isn't the most comfortable, but now that I am aware of how it handles,
doesn't bother me a bit. My CG is way to far forward I think, so that
probably makes the slow flight a little different.
On a side
note.. I turned around and looked at the tail the other day
while indicating 200KTS. I could see the elevator counter weight, or
almost all of it. I didn't expect to see that at 200. Maybe
100.. haha This leads me to believe that I have a forward center
of gravity. The big engine would explain that. Once I get the
plane on some scales, the only thing I can think of is to move the
battery. My battery is behind the passenger seat.
Has anyone
mounted a battery behind the baggage compartment?
Advice?
Thanks
Tom
www.N54SG.com
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