Master Airscrew 3.1:1 for S400 RC Aircraft Gearbox - MAS3431 Scatter Terrain Brace provides additional rigidity to

Brace provides additional rigidity to the differential housing

TRX5391R gives you everything needed to rebuild the gearbox casing rather than replacing the entire drivetrain assembly

making it a practical choice when worn or damaged parts are affecting steering response

eliminating the need to source and mount wheels separately

Master Airscrew 3.1:1 for S400 RC Aircraft Gearbox - MAS3431 Scatter Terrain Brace provides additional rigidity toThe Master Airscrew 3431 gearbox is a 3. 1: 1 reduction unit built for S400 size motors in electric RC aircraft. It steps the motor speed down through a 3. 1: 1 gear ratio, letting you swing a larger, slower turning propeller for more efficient thrust on lightweight park flyers and electric models. If you're running an S400 motor and want to convert it from a direct drive setup to a geared one, this is the gearbox to do it. The MAS3431 is a direct