Trimming

[Del Rykert]

Make sure your elev. gap is sealed. Add some down thrust 1 to 1 1/2 degree
for starters and would move c.g. back a little bit if in 45 degree bank nose
of plane decends significantly. Do each change one at a time. Seal, then
c.g., then change thrust would be my chain to follow. Do your elevators have
a feathered trailing edge. To a fine thin edge? That can cause hunting in
pitch as well as loose linkage or loose servo linkage. Let us know how it
goes.

     Del K. Rykert
     AMA - 8928
     NSRCA - 473
     Kb2joi - General

E-mail Address(es):
  drykert at rochester.rr.com


----- Original Message -----
From: "Gregory Morris" <greg_morris at email.msn.com>
To: <discussion at nsrca.org>
Sent: Monday, September 09, 2002 3:23 PM
Subject: Trimming


> I have a newbie plane trimming question.
>
> On my new plane if I trim for straight and level flight at full throttle,
> then reduce the throttle to say half I need to put up trim in to maintain
> level flight. I know a slight amount of up trim may be required, but I
think
> in my case it might be excessive. Also, when the plane is trimmed for
> straight and level flight, the elevator has a few degrees of down  instead
> of  neutral. Up and down lines are relatively straight. The wing and stab
> incidences are fixed, and can't be changed. The plane hunts a little in
> pitch, but I think it is due to trimming the elevator at one speed, and
> flying at another. Inverted flight takes just a breath of down pressure to
> maintain level flight.
>
> Question is.. will a CG change(move back more, or forward), or the
addition
> of down thrust help this condition, or do I just adjust the elevator trim
> for a happy medium, and live with it. Does anybody have any ideas?
>
> Thanks
> Greg Morris
>
>
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