Thanks for the kind comments. I had the first flight today. 42 degrees and 15-20mph quartering wind. Had lots of compliments and "What is that?... Did you build it?' The OS 120 give LOTS of power. There is no replacement for displacement. Cruising at 1/4 throttle easily. I think a good .90 would be plenty as long as it gives good vertical performance. The 120 has that in spades. An OS 95AX would be a nice choice and would save around 4.4 oz. I do have a SuperTiger .90 in the shop so I may try that later this summer.