RE: info on supertigre .61X K fire engine
The engine runs ok ...... but was never in a league with the OS, YS, Webra or Rossi.
However I seem to recall Hanno Prettner flew one in the Calypso for a while.
Not too bad of an engine if you set it up with a longer pipe and a 12x9. Ok power for lighter pattern ships in the 7 to 7.5 lb range.
Its heavy. IMO skip the whiplash idea.
Confused though.... the X series and the K seriese are quite different versions.