Is it VMar's. If so this is what I know. The guy I know has a ST 51 on his. Pretty stable flier, seemed a bit touchy (he may have had his throws a bit high), pretty good speed. Let me say this. The guy who owns this planes goes through them pretty regularly if you know what I mean. However, this plane has by far outlasted any of his others. One of the problems he has had is with the nosegear. Regardless of how he lands it seems to turn one way or the other. I must admit, I was skeptical when I first looked at the construction but the plane held together for a ton of flights (until he got to close to the ground while dogfighting, but that's another story).