RE: Lets see your ULTRA SPORTS !!!!!!!!!!!
cde:
I have it on a Twist 150 right now, running an APC 18x6W for accelleration and vertical. In the US1000 I would run a 17x8 for a bit more speed. I ran an ST 2500 in my US1000 and even though that engine had a lot less power than the 160, it was FAST and had excellent vertical. I plan to build another US1000 and put the 160 in it.
I have had the 160 on three planes so far, and none of them has required a pump. If you put the tank back over the CG, you may need a pump, otherwise, no.
OBTW: Yours looks like it has the long wing. The original short wing version has better aileron response, tracks better and is much easier to land. But it isn't technically IMAA legal. You can make yours a short wing by cutting the last bay off each wing.
Jim