Now, I know this is going to sound pretty simple, but i'm trying to settle a argument.

see, what's happening is i'm having a discussion with somene about aircraft physics - namely, rudders. What i'm arguing is that, if the wings are kept level, a pilot could alter his/her flightpath using just the rudders. As a pilot myself i'm pretty sure it's possible (if a little inefficient compared to banking) - it's just the guy i'm talking to doesn't believe the rudders have anything to do with flightpath at all.

now i'm not talking about civilan aircraft - i'm talking about all military jets, although the Su-34, AV-8, and A-10 are the focus of the argument right now. can someone please help me confirm that it's possible to turn with just rudders? i'd really appreciate anyone with experience on any of these particular aircraft to comment too.

Cheers