@JetCarRacer No problem. One more thing, try to distinguish your successive builds visually somehow. If the thumbnail looks the same, people will think it's a repost. Even something as simple as racing stripes will let people know that this one's different from the last one.

Thank you for your advice @SledDriver ! I will remember that for my next build, and I'll have a go at improving this one!

I like how you're exploring the game's flight model. There's no reason a 3000 mph aircraft can't be as stable as a 1000 mph one. Here's what you can fix:

• Roll control surfaces need to be aligned with the center of mass
• Wing loading is too low, which is what causes flutter at high speeds; try to get it above 20 lbs/sq ft
• For high speed flight, you need to reduce the maxDeflectionDegrees of control surfaces for optimal handling. It's just like real airplanes -- if you deflect a control surface 35 degrees at Mach 3, the wing will probably break apart. To increase/decrease the control authority, adjust hingeDistance and/or the size of the control surface.