I am looking into getting a Great Planes Spacewalker ARF and I am wondering what gas engine to put on it. I would like to go with some kind of weed wacker conversion engine. What engine would fit the best and what sixe do I need to fly this plane. What will I have to do to get it to balance properly. Any one out there do this to this plane yet. Let me know.

Rick

I've got a Zenoah G23 on CH Electronics ignition on mine. The plane balances perfectly with 3 servos under the stab. I've got several weedie conversion engines that would fit too, but I simply picked the smallest displacement gas engine I have, since the Spacewalker would be way overpowered on any of them. You'll need a side carb and side exhaust engine, as the cowl is not very long. Ryobi is out of the question. I've got several Kioritz/Echo 25.4cc engines that are also perfect fit for this plane. Homie 25 or 30cc could possibly work, but are a bit porky. You'd need to use an electronic ignition on any conversion engine. This plane likes about a 30 Oz engine with servos up front and about 40 Oz with servos at the tail. Anything with stock magneto will be easily over 3lbs and too heavy.

This would be a great plane for a small gasser. They come out tail heavy.

I would recommend the RCS 1.4 gas engine or the MVV Engines. (sp?)

The MVVS may be the better choice between these two for this application, as you wouldn't have to mod the firewall to clear the RCS motor's rear carb.

I have a 21cc weedie that I want to convert. I didn't thnk about the CH ignition mod. I am undecided about what engine to use on this plane. I would really like to get a 4 stroke glow engine but they cost a fortune. I have a new ASP 1.08 that I could use also. I would really like to get into gas engines. The cost of fuel is the main reason.

Rick

If that 21cc is a Weedeater brand, forget it. It's not worth converting, as the power is probably equal of a .60 glow.

OTOH, if it is the Echo 21.2cc, then go for it.