I know this is an ARF/RTF forum but I think some of you know the answer to my question.

I'm trying to side mount a Thunder Tiger Pro 46 onto my Sig MidStar 40. The stock muffler does not clear the fuselage at the bottom. What is the best way to make this work?

1)use different muffler?
2) mount the engine about 75 degrees or maybe 105 degree's off vertical?
3) reshape the bottom of the fuselage?
4) or drop the engine below the thrust line just enough to clear?

What would happen if the engine was say 1/2" below the thrust line?

striker

Buy a muffler extension for an OS .46. It should fit perfectly.

When I mount an engine that will to the side, I generally align the engine to the muffler is directly beneith the fuselage. Therefore, I suppose I am mounting it at 125 degrees or so. The other advantage to this is that most of the oil stays off of the plane.

I have side mounted my Thunder Tiger 36 by just creating a form fitting cavity in the lower corner of the fuselage. This was on a Kobra and a Sig LT-25. Cut out enough of the fuse, running the cut to the curves of the muffler to get it to fit. You will have to grind a little of the firewall with your dremel. Then fill it back in with balsa and spackeling, sand it, paint the area after fuel proofing and your are done. No expense of buying a muffler extenstion and you have a neater, tight-fitting installation.

catboatr has the answer.

Pitts Muffler!