The Rutan Model 74 Defiant is a ARTF twin-engine aircraft with the engines in a push-pull configuration.    The advantage that an push-pull configuration provides is the ability to mount two propellers on the aircraft's centreline, thereby avoiding the increased drag that comes with twin wing-mounted engines.

It is also easier to fly if one of the two engines fails, as the thrust provided by the remaining engine is symmetrical, unlike a conventional twin-engine aircraft, which will yaw in the direction of the failed engine, and becomes uncontrollable below a certain airspeed.