RE: Rossi Quickie 40 - Needs a plane
Hi tIANci
This appears to be the old FAI F3D engine (no longer in production), likes to be propped to reach at least 23000 on the ground with relatively small FAI props. A 9x7 may be way too big. When running that range of 23000 RPM plus, with the pipe relatively short, you'll hear it stage onto the pipe very clearly. Not in the league of the MB40 (or Nelson or Jett) but quite powerful. The range of APC carbon props used for Q40 work quite well for me anyway. 7.4 x 7.5 and thereabouts but these would be with slippery F3D type aircraft. I have flown Q500's with this engine and APC 7.8 x 6 carbon, perhaps this would suit a more draggy aeroplane.
Good luck!
P