I can't remember the rpm figures for the Echo 16cc I did, but it was my first gas conversion. It flew my 11 lb. Ugly Stik fairly well at sea level, but when I later moved to an elevation of 4000', (with hot weather too!), performance was less than stellar. It would be great on a "floater" like a Cub or Telemaster though.

I have a McCulloch 22cc which is about the same weight as the Echo 16cc for sale if anyone is interested. It is all converted, and ready to fly on either Gas/Glow or regular gas ignition. Just PM me...

AV8TOR