BC:

If I had to pay your prices I'd probably use a lot more OS engines. My last OS purchase was a 46 FX, I have it on a Magic, it does very well with the APC 12.25x3.75 prop. But that set would not be suitable for your plane.

If you think the 46FX (with a suitable prop) would pull the plane OK, I'd be inclined to the 70 4s engine.

If you think the 46 wouldn't be enough power I'd have to go with the 50 2s engine. It will give a little more power than the 46 withought the weight penalty of the 4s engine.

Now tell me how to get OS engines at the same price.

Bill.