Its doubtful it will fly a good knife edge.

In knife edge flight the fuselage provides the lift because the wings are now 90 degrees to the ground. That maneuver requires a fair amount of power and coordination of the control surfaces. The rudder now serves the function of the elevator, the elevator serves as the rudder once the aircraft is rolled to 90 degrees. At 45 degrees the wings are still producing some lift, it still requires good coordination of controls to maintain a straight line of flight.