Malcolm,

I cannot explain the trimming to satisfy you unfortunately, but both Nat Penton who is an aero-expert, and Bryan Hebert who needs no introduction more or less agree on this.

Nat will tell you that KE pitch coupling is a function of the thrust-wing incidence separation, his take on it is that they should be less than 1/2 degree separated. Bryan disagree's a bit with this, but by emailing and talking with both of them and apply both their ideas as best I can to my airplanes I am able to eliminate KE pitch coupling. I have done it on my Twisters, and friends Twisters, a friends Dream 110, and my Integral. It takes some patience, and back and forth to get everything right, but well worth the effort. Seriously on the Twister the only mix I was left with was 1% of down elevator with low throttle....and I thought that was not worth the effort to remove!!

I like you, don't like to take things on blind faith....but I figure these guys have much more experience than I do at this so I did this one time and its working for me I can't out smart Nat, nor out design Bryan

On my Twister, I could not get it trimmed in all conditions until I got rid of the downthrust....that was the whole problem with that airplane. Once I did that it was a simple matter of a few small tweaks of wing incidence/CG, and finally stab to get it about as perfect as you could ever hope. The Integral is pretty much going down the same path, and I am sure I will have it nailed shortly, and I can provide some references.

On my Integral it flew off the bench with no aileron trim, so I am surprised that yours needed some, maybe there is some variation in the kits?

* Simon *

I will get some pics later, its not pretty how I did it but hopefully it works.....if my wing panel comes off today then I won't post pics LOL