Greetings all,

I am in the process of tinkering up a Ryobi 31cc motor for a Dynaflight Decathlon I have the hots for. A couple of questions...

1) What motor mount is the shortest/best fit for the Decathlon? I see on the several websites that offer Ryobi conversion parts that there is a range of finished lengths... The Dec calls for about 6 7/8 firewall to spinner backplate.

2) What muffler of the several available makes the most power and would work with a smoke system? Noise is not really an issue at our field.

3) I plan on putting the Bowman ring in the mill, other than that no mods planned. Will probably run Amsoil after the ring gets seated to pick up some rpms. Any other tips? I need to get sparkplugs, too. What works best?

4) How big a prop will the Decathlon handle? I would like to go with an 18-incher for more thrust if possible. What do you think, 18-8? What brand? I mostly use APC in the smaller sizes (up to 14 inches) in my other planes.

5) Any mods to the airframe necessary for strength or balance? Servos in tail or under wing?

Thanks in advance. I got a lot of answers searching this forum already, these were just some specifics I needed clarificaiton on.

Tim