Note: At very low torque, this mod makes the rotors consume extremely low fuel, making them rather overpowered for small planes such as the one pictured. Balancing is in progress. The Kerbal Space Center made a biplane using the R121 turboshaft engine, and it ran out of gas before it could fly a km away from the space center. After Jeb safely whipped that baron onto the mysterious green substance that makes the scientists yell at him for not cleaning his boots, the incident report team at R