Hi,

I am flying a twin Armadillo rated at.25-.40 (non ABC). I am using 2 .40 OS LAs, the biggest engine recommended. However, I am also at 4700 Feet above sealevel. The performance of these engines is fair to good, they seem to be able to pull little more than their own weight at this altitude. I would recommend a .46 engine with ABC in my situation. It seems lots of people here are sticking huge engines in their planes to match the normal sized ones at sea level. Plus, my LHS says he has high performance .46s (GMS?) for little over $60, new.