The engines are 4 " from the fuselage with both spinning in the same direction. I used a Y adapter to plug into the connector for a motor which is found on the rear of the brick. The thrust position of the motors on the wing is important.
Great mod. How far apart from the fuselage? Was there a spare channel for the throttle for the twin motor? How do you setup contra-rotating (opposite direction) or both are spinning the same direction?