http://www2.towerhobbies.com/cgi-bin...=++&search3=Go

You could try these...the others are right a .40 engine wont make more than a rich set vapor trail from smoke oil,if you can plumb it into the plane...it might work better if you could fashion a small shield for the muffler to keep it hotter while its flying....I have a couple of smoke riters but havent tried them yet...Rog