I posed this question over in the Tips forum, but maybe it would be more appropiate here.."I read recently about a plane that had engine smoke stream from the wingtips whenever the smoke system was on. Anybody know how this is done? How was it plumbed?"

The late Dan Santich did it on his Ultra Hots, don't know how it was plumbed...Obviously had tubes in the wings but the connection from the muffler would put quite a bit of heat in the wings close to the fuselage...

April 1983 RCM page 86. Exhaust from muffler was piped to center of wing to a tee that split the exhaust to each wing tip. This was done on a two cycle .40 glow engine.

I built a plane in the early 90's with wingtip smoke. It had an 85" wing and powered by a quadra 52. The wing was foam and I cut a hole down the length of it and made a tube of Nomex paper in it. The exhaust system was Rube Golberg to get it in the fuse and than routed to aluminium tubes that were in the wing. With all that tubing the engine was down a bit on power also. There was an article in RCM in about 91 or 92 that a club member did on it