Trim

[george kennie]

I agree!

"Karl G. Mueller" wrote:

> Georgie, One thing you don't want is a "completely neutral" set up.
> Itwill be very hard on the servo gears, especially when it is
> tooneutral in pitch.My last years Star had an almost neutral set up in
> pitchand it started stripping the gears in the elevator servos.It took
> me a little while to arrive at this conclusion since therewasn't too
> much left of the plane when this happened the secondtime. My
> suspicions were confirmed after talking to some "AerodynamicsExperts".
> Every moveable surface wants to hunt for a neutral positionand if
> there is no opposite force ( Trim ) to stop it from doing thisyou will
> get a certain amount of oscillation ( flutter ). Having a minuteamount
> of trim offset puts a slight force from the airflow over it in
> onedirection and will put a stop to any oscillation. "Completely
> Neutral"is not the ideal condition. Karl G. Mueller
> kgamueller at rogers.com
>
>      ----- Original Message -----
>      From: george kennie
>      To: discussion at nsrca.org
>      Sent: Friday, February 13, 2004 12:50 PM
>      Subject: Re: Trim
>       "Completely Neutral" is the most complex descriptive
>      condition that one can conceptualize. There are so many
>      variables, that there is only one specific set that will
>      approximate the required parameters to achieve the "voila"
>      condition.Change one thing and you no longer have
>      "completely neutral".
>      Not trying to be corrective here, just stating that in my
>      experience completely neutral is more than elusive, but
>      somewhat attainable under certain conditions.
>      What I'm currently searching for is the correct force
>      arrangement that will give me a neutral airplane at the C.G.
>      that I like to fly at. I would like to fly an airplane that
>      adapts to me not the other way around. Elusive? Yeah! But
>      attainable? At this point, I think maybe!
>      Georgie
>
>
>
>      Patternrules at aol.com wrote:
>
>     >  In a message dated 2/12/2004 11:26:21 AM US Eastern
>     > Standard Time, natpenton at centurytel.net writes:
>     >
>     >      For an airplane that goes to the canopy in
>     >      knife-edge most trim charts say , after
>     >      adjusting cg , to increase the wing incidence .
>     >      My " theory " says to decrease the wing
>     >      incidence. What is your theory/experience ?
>     >
>     >  What does the plane do in the down lines, if they are
>     > good you could just mix in a little down elevator with
>     > rudder, for the knife edge.  Nat, I would have thought
>     > that a guy that designed the Voo Doo Express that was
>     > completely neutral, would have all the answers LOL.  Steve
>     > Maxwell
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20040216/b2b11f9b/attachment.html