Chip

[Bob Richards]

Dean,

I remember helping a friend of mine trim an EU1, and
was surprised that it took a slight amount of left
thrust. I always wondered why, and the only thing I
could think of was the large amount of side area above
the thrustline, in front of the CG. What you are
saying seems to correlate.

Bob R.



--- Dean Pappas <d.pappas at kodeos.com> wrote:
> Hi Jay,
> Funny you should ask. Hey Nat, got any pictures of
> the old UM2?
> The answer, short of showing you a picture of one of
> Nat's old designs is to build a plane that is
> symmeterical around the thrustline. It's gonna look
> fuunny but, "chins are bad, Hmmkay".
> You want to center the fin and ruder area heightwise
> on the thrustline, too.
> If you can design a plane with nose area above the
> spinner and almost none below, you might get there.
> Some EU1-As trimmed with almost no right thrust,
> mine was one of those.
> Brown had a Phoenix 6 or 7 that had a tiny fraction
> of a degree of left thrust, as I recall.
> Even if you don't entirely eliminate the need for
> side thrust, if you get it under a degree and a
> half, the compromise and unwanted dog-tracking gets
> much much better.
> 
> Of course, electrics don't need chins! That's
> probably where the funky anti-Kirk Douglas chin on
> the Onyx comes from.
> 
> Dean Pappas
> Sr. Design Engineer
> Kodeos Communications
> 111 Corporate Blvd.
> South Plainfield, N.J. 07080
> (908) 222-7817 phone
> (908) 222-2392 fax
> d.pappas at kodeos.com



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