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Old 05-23-2008 | 10:59 AM
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MHester
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From: Woodstock, GA
Default RE: Knife edge trimming question

Actually I set up Arch's plane...and the red one identical, only I hadn't really gone "back" and rechecked where everything ended up after flight trimming. They both pretty much came out what I thought might be nose heavy at the time, and a little more positive incidence in the wing than I had previously run. When we went back and checked, guess what? +.5 on the wing and a more forward CG. So to make a long story short....we were using that set up for a while but not really aware of it. It just worked better, so I think in my case, the method Bryan mentions is proven...by me, Arch, and a lot of others who have had the same experience.

Gets better. The plane I am flying now had some issues when I rebuilt it. I couldn't put my finger on it. Flew fantastic, but just felt odd and did some strange things in really oddball flight attitudes that none of the others did. I went back and did some checking recently (when it was rebuilt for the second time) and discovered I had lost my original zero reference line due to sanding the plug for the canopy. I discovered I had the wing at 1.5 NEGATIVE. After a few turns on the adjusters, voila, the heavens opened and it's flying like a dream. Case proven again?

So obviously the plane will fly fine with even negative in the wing, but it won't lock on and will do some strange things that you may not even notice unless you're playing with KE loops and outside loops with integrated 4 points across the bottom. Everywhere else it flew fine with practically no mix even...but in bizarre situations, it would couple pretty wierd.

I think what we are doing is getting SO demanding on these airframes that they have to fly with every wierd angle of attack, bizarre fuselage side loads, you name it....and we as a group never really played in this area too much before. And as the schedules have changed, so have the demands on the pilot AND the airframe, putting us all into really more aggressive and demanding positions than we were years ago.

Experience will bring you to the same place eventually, if you have an open mind and aren't afraid to try something new. But you have to be ever vigilant.

Do we have it all figured out? Anybody that answers "yes" is delusional...we are ALL still learning, still experimenting, still pressing....and this is good news to everyone flying pattern IMHO. In days past we'd sell an airframe if it didn't act right, and for a while, most didn't with a 0-0 set up. Some did ok.... but all we had to go on (in general, I mean average Joe) was the trimming chart on the NSRCA site. And it's wrong fellas

Now we have a new one. THANK YOU BRYAN HEBERT FOR TAKING THE TIME TO SHARE IT IN DETAIL!

-Mike