Another flyer came to the field with a (this is the second I've seen now) GP Mustang ARF. What a pig. Even with fixed gear, it probably weighed about 1/4-1/2lb heavier than my retract equipped Kyosho. It was equipped with a OS 46FX and struggled to get off the ground. In fact it took probably 200+ feet of rollout to get enough speed to lift off! For comparison purposes, my Kyosho gets airborne in about 50-75 feet every takeoff. And the GP needed to be landed on the hot side. It seemed to want to drop a wingtip when stalled, and it stalls earlier than any plane I've ever seen.

I've got a friend who flies a kit buit GP Mustang and it couldn't be more different. It flies like a classic pattern plane (probably because it shares its airfoil with the chaos and ultra sport) much like my Kyosho. The kit and ARF are 2 completely different designs, don't really know why GP decided to make the 2 different.

I've heard that some people have had good results with the GP ARF putting in a 61 2C or 70+ 4C, but this is probably one ARF you want to stay clear of...