It looks like a Quickie Jett to me. Bob should chime in to confirm it though. With that muffler you will probably have the best luck with the 8.75" and 8.8" pylon props. I would seriously consider investing in a Red Jett carb. With well over 100 flights on a Jett powered Dust I still wouldn't like to fly it with out a throttle. Just getting it to a launch location/position at full throttle could be dangerous at full throttle as there is not much to hang on to. I usually had someone launch mine by holding both wing tips and just letting go while pointed about 30/45* up. Others do launch their own but I suspect not in high wind conditions. There are two Dust launch videos on my site.