On 20 Mar, 01:39, Doug Hoffman wrote:
Bob Cook wrote:

Although "no gravity is not possible,

Sure it is. *Place your glider in outer space. *Likely? *No. *Possible?
* Certainly.

Or just fly a vomit-comet style ballistic trajectory.

And lift(as we are using the term) without gravity is not possible.

Aircraft in a 90 degree bank can still produce lift ...

Ian