Yes yes, it's another C.G. question... (but different, really!)

I have an unusual planform: A delta shape that has strakes blended into it. The overall shape does not have straight lines. (see picture)

How would you go about finding the AC on this shape?

Break it down into a multi panel layout with straight line segments that approximate the shape. Then you can use a MAC calculator that does multipanel wings to determine the MAC. From there start with a 20% of the MAC location for your CG.

Or build a little test glider and play with it by moving the CG around and playing with the reflex on the trailing edge until it glides in a stable manner that can recover from stalls but doesn't recover TOO quickly.

VERY COOL CONCEPT!!!

Thanks for the replies...

BMatthews, I went by ypur suggestion and found a neat program on Martin Hepperle's site. It's called A.C. Calculator. It analyses a bitmap of the planform and calculates A.C.'s according to that. Neat! (I added a screen shot)

RAPPTOR, Thanks. Here's the finished design.