I have a sig SE that I just love to fly, in fact the other plane has been gathering a lot of dust since the SSE has become air worthy. I like this plane so much that I have gotten another SSE kit to build so I can have two of them in my fleet. The first plane was built to plans, but this one I would like to put my own touch to it. Okay, two questions. The first plane has a OS 46ax, but I would like to put a 4s on this one. Most of my flying is done at half throttle or less so I figure a 4s would have the torque curve closer to the speed I like to fly, plus the sound of a 4 stroke is sweet to my ears. But when I do open her up I don't want any less power than the 46 has. Also weight is a consideration, meaning I would like to stay as light as possible. Have been looking at the 50 size 4 strokes. The new OS is a 56 and have seen some older 52s. Would these engines be comparable to a 46ax or what size would be. Now for the second question, I would like to invert this engine so I can build a nice cowl without any big holes on the side, but the fuselage height and thrust line combination makes it impossible to drop the tank far enough to make the center of the tank close to the carberator. Wondering if a high as possible loop in the fuel line would work or am I stuck putting in a side mounted engine