Jett Sport 50 or Jet Fire 50?
Well I think i can help you with this. A while back back i went throgh that. Dub Jett told me that if i was flying a sport type prop jet, than the Sport 50 would be the one (which is what i got). That Jett fire .50 is for more like 3ish pound pylon planes or Diamond Dust etc. They are front intake, rear exhaust. I guess it would be whatever would set up better on your plane. That Sport Jett. 50 will pull my DC F-20 6lbs at 125mph and 140mph at sea level. It will work fine on a whiplash or virtually anything.