Trim Question

[Ed White]

Dan,

Sounds like you might want to try some differential
aileron (proabably where Nat was going with his
question about rolling in vertical?).  From what
you've described (nose drop in pure roll) it actually
sounds like proverse aileron-yaw coupling, the plane
yaws in the direction of the roll.  This is opposite
to what you usually see called adverse aileron-yaw
(yaw opposite to roll direction).  The point being
when you try aileron differential, don't just try more
up aileron than down and give up if it doesn't work. 
Also try more down than up.  THEN try something else
if it doesn't work.

Ed

--- Nat Penton <natpenton at centurytel.net> wrote:
> Dan are your vert rolls axial ? What % rud/elev mix
> ? Any other mixes ?    Nat Penton
>   ----- Original Message ----- 
>   From: Dan Curtis 
>   To: NSRCA Discussion 
>   Sent: Sunday, April 18, 2004 12:57 AM
>   Subject: Trim Question
> 
> 
>   Well I have run into a trim problem with a plane
> that I have not seen before.  Time to tap into the
> wealth of knowledge on the list.
> 
>   The plane generally is flying pretty nice. 
> Uplines/Downlines are good, minor mixing for
> knifeedge stuff, good feel while inverted...etc.
> 
>   Problem rears its ugly head in rolling to
> knifeedge.  When using small aileron movement to
> slowly roll into a 4/8 or 4 pt for example the plane
> will pitch to canopy.  Not drastically but I would
> say moderately, more than enough to cause a concern.
>  However, if you do a full 4 pt or slow roll with
> rudder coming in the pitch to canopy does not
> happen.  With good top rudder the plane is trimmed
> to fly very nice straight knifeedge flight right or
> left.
> 
>   I got to playing with is some today and when I
> would roll from upright to knife edge with no other
> input other than the aileron deflection the plane
> would have a predictable drop of the nose and would
> begin going to the canopy.
> 
>   What am I overlooking here.  Any ideas or has
> anyone run into this before?
> 
>   Thanks
> 
>   Dan Curtis



	
		
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