Being a beginner allows me the luxury of asking stupid questions right? Well, I'll ask anyway. It occurs to me when I see a pop off, that I am really seeing a high speed stall. Since you can stall at any speed if the wing exceeds the critical angle of attack, it sure looks like that may be happening. So, is that what is really going on? (assuming no other malfunction) Jack RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]