There is a difference between just slowing the craft and producing recoil force on the same order as the engines. If a plane is flying at a constant speed, the

There is a difference between just slowing the craft and producing recoil force on the same order as the engines. If a plane is flying at a constant speed, then its in equilibrium. The engines are producing an equal amount of thrust to the amount of drag on the plane. Any recoil force will upset this and slow the plane down. This doesnt mean that they are producing more force than the powertrain. The A10 doesnt do this either of course. It produces more recoil force than one engine, but not both.