Absolutely! As I said, there are many things that contribute to flutter and we need to minimize all of them.

I never said that a gap was the only thing that causes flutter. But it can contribute to it. Doesn't always, but it can. And I explained one situation where it can.

Yes flutter can occur with a sealed gap. And it can occur with an unsealed gap. But the question is if the gap can help induce the flutter.

Will sealing gaps prevent all flutter? No. But it can help to prevent some cases of flutter. Combine that with solid control systems, eliminating flex in flight surfaces and control surfaces, braces when required, counter balances and other techniques and you can prevent most cases of flutter.

But you made the statement that sealing a gap can CAUSE flutter. Please give us an explanation of how this can happen. What aerodynamic force associated with a sealed hinge is going to cause flutter that wouldn't occur with an unsealed hinge.

Dave