It's not impossible it's just a lot harder. A Rudder/Elevator only ship has either more dihedral or is polyhedral....as I'm sure you know. To make a Rudder/Elevator ship roll, you yaw the model with rudder, getting more wind under the wing you want to raise. On tow with a Rudder/Elevator ship it is very hard to yaw the nose one way or the other to get enough roll to keep the wings level, because of the tow line pulling the nose straight. Ailerons just make it a lot easier.
Pete
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