Ghengis
it is possible to fly at 60° of bank and 1g.
To turn you need more than 1g
At the risk of being pedantic, that's an oxymoron
Mmm... come to think of it, set up a descent, the rate of which increases at 32 feet per second per second and you should be able to do a perfectly balanced turn with 90 degrees angle of bank. Wouldn't be able to keep it up for long though.
Mike