Dick
Sure glad you are building this airplane...I'm looking forward to the tips that can come from your experience. I JUST GOT MINE and so far I've only been able to admire it in the box. The comments about an OS 160 being somewhat heavy and underpowered are a little alarmist.. I have a 1/4 scale cub weighing 17 lbs dry with a OS 160 twin and glo driver set up, similar to what you describe, and it flies like a ***** cat. light as a feather wheel landings (when I'm hot), etc. No sign of heaviness. I use an 18x8 MA classic prop and get about 6900 rpm. I use the big prop primarily for noise reduction and it works great. I plan to use this set up in the DP cub. The OS 160 fits like a glove, as you show in your pix. Good luck and frequent posting!