Hello Tom

I am flying the 3.3M, they have been outfitted with DA 150s and KS 1090 tuned pipes,also I run Mejznik 32x10 propellers. With this combination the performance is very good. I have not developed structural cracks in any of my Yaks to date, and I fly them extremely hard. The best weight that I have seen on mine is 41.5 - 42 lbs.

Bob