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Old Oct 11, 2012, 07:01 PM
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Ken, trimming is always a compromise. The things that are going to affect this tuck in knife edge are: CG, wing incidence, thrust angle and dihedral.

Moving the CG forward will help but could take away from other areas of performance. The forward CG will require a bit of up trim that will help fix the issue.

When setting up an aerobatic model, I always set the engine and stab to zero and the wing at pos. .5 degrees.

Adding Dihedral on a low wing model like the Cap can help as well but again can cause other things. The first thing that comes to mind is roll coupling when rudder is applied.

My first IMAC airplane was a Ohio Models 33% Cap. I remember having to run the CG a tad forward and mix the rest out. Nothing wrong with a mix as long as it is not excessive.
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