mike regish wrote:
It actually possible to hold altitude in a straight line with a 90 degree
bank. I know because I've done it in a real plane.

I've done very close to 90 degree turns in a Decathlon. I wanted to see what
6 Gs felt like. That's about all we pulled and I hit a full 90 degrees
momentarily several times. I was within a few degrees of 90 for the entire
turn.

Yes, folks forget that the wings aren't the only source of lift.

Matt