Hi Bob Yes it is a G&P F18 with an OS91FX...I hope this 91FX runs better than my other one Im sure you know the history on these engines. I have not flown it yet due to a couple of problems. One problem I have with the airplane is prop clearance between the prop and the horz stab but I have a prop extension from FOX on the way to solve that. The other thing is my Springair retracts catching the doors on the way up...(not good) still not sure how to fix that. The doors are spring loaded open so I will try stronger springs first after that I dont know. Any suggestions will be appreciated and also tips on how good or bad this thing flys