engine
If you go with the F-16,use a OS 108,all the power you want,but cost a lot less than the Jett.
By the way,My Jett 90 will completely drain the fuel tank on my F16(maybe10 or 11 ounce) in a little under 4 minutes if I fly at full throttle,I would think the OS would give greater flight times> just my thoughts.
Steve
ps If you read the instructions and make good connections to the retracts ,they work Perfectly,even off grass.Setting them up correctly is the key to a reliable retract system.