The key concept is Coanda effect: https://en.wikipedia.org/wiki/Coand%C4%83_effect https://en.wikipedia.org/wiki/Coand%C4%83_effect There's a diagram of how th

The key concept is Coanda effect: https://en.wikipedia.org/wiki/Coand%C4%83_effect https://en.wikipedia.org/wiki/Coand%C4%83_effect There's a diagram of how this is implemented in the aircraft: https://www.baesystems.com/en/article/magma-the-future-of-flight https://www.baesystems.com/en/article/magma-the-future-of-fl... For roll, air is blown out of the TE aftward. Per Coanda and the lift equation (lift is proportional to square of flow speed), this blowing will generate higher lift on one wing, imparting a roll moment on the aircraft. For pitch, air is blown up at the engine's exhaust surface to point the flow up/down. It is shaped so that with 0 blowing, it's pointing down.