"Quilljar" wrote in message
...
I think it is true to say that it is possible to 'roll' any aircraft.
Because if done properly, there should be no more than a very slight extra
strain on the airframe.

Depends on the kind of roll. But yes, it is theoretically possible to
maintain low G forces throughout an entire roll. Witness the 707 prototype
that was rolled over Lake Washington back in the 60's.

Not all rolls have this characteristic though.

Pete