Originally Posted by
1967brutus
Assuming that the plane has sufficient power with that 1.20 fourstroke to not need full power all the time, you would be looking at something like a 1.50 fourstroke to convert. Saito has a 1.50 that lends itself very good for conversion, and you will be amazed how userfriendly that engine will become.
ASP, OS, Magnum, they all can be converted just as well, but Saito have the best cooling properties with their cylinder/head in one single casting.
I have done one for a customer, runs pretty good.
https://www.youtube.com/watch?v=GmwOli-RX0k
Care and attention must be given to proper cooling air ducting ("Baffling"), and fuel plumbing is slightly different than for glow fuel, but nothing "black magic".
I would definitely go for the fourstroke approach because for 2-stroke, this particular power range is a bit of a black hole: not many options between 15 and 20 cc.
But IF you do, I would suggest getting a .91 heli engine, the heatsink head will solve many cooling issues.
Feel free to ask any and all questions, I have no secrets and sharing info is the name of the game.
Thanks for the info. That gives me lots to think about, along with all of the other issues I will have scratch-building this plane and making design modifications to the airframe (for other reasons). At least now I know what is possible.
I got out of the hobby for many years, back into electric planes a few years ago, and glow planes only last year, so I am having to learn a good bit about modern engine technology. I think it is great that people are keeping this aspect of the hobby alive (as well as actually building planes). I am trying to to my part for the hobby, because without enough people doing this, it will die.