I am using a 20oz tank and the CG testing was done after landing. Because of extra fuel in the tank, the plane is "nose heavy". With 10 minutes of IMAC style flying, there is about 5-7 oz of fuel left in the tank. I am considering switching to a 16oz tank. Any idea on the max time I can have with 16 oz tank?


I think it is OK to place the tank right on CG as most pattern flyers do. The problem is how far back it can go. I've tried 5" 1/4 behind LE yesterday and the plane is definitely flyable, though the up trim on elevator is still needed.

I am looking into other problem areas. Looks like incidence on wings may not be right as measued. Setting the Robert meter on the root section of wing, I got a reading of -0.75 degree. On the middle of the wing, it reads 0 degree. So some kind of warp is going on. A negative incidence on wing definitely explains the "nose heavy" problem. I would think the measurement on root section is more reliable?

BTW, the engine is a DA50.

--qc