They probably turn a lot like rudder only airplanes do. Due to dihedreal or wing sweep, the yaw will cause the plane to bank and if there is no pitch control, the increased airspeed of the resulting shallow dive will cause the trim to give the plane "up elevator". On planes with no elevator control, the airspeed controls pitch. The uptrim needed to cancel out the nose heavy CG only flys level at one air speed aka the plane's "trim speed".

On rudder elevator planes, you can do complete rolls without ailerons, the rudder rolls the plane almost like ailerons do. If you switched the aileron and rudder channel on a typical trainer and didn't tell the beginner flying the plane, about the only thing he might notice is that the plane seems to dive more than usual during a turn. A more experienced flyer would of course notice that the plane skids nose in during the turn rather than nose out. Only using elevator and rudder together results in a coordinated (non skidding) turn.