Trim Question

[george kennie]

To me it sounded like two things. I felt that he already had differential with
the up-going ail too much and I also think that he might have the C.G. too far
forward, but I think I need to defer to one of the smart guys.

Ed White wrote:

> 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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