Master Airscrew 3.1:1 for S400 RC Aircraft Gearbox - MAS3431 Scatter Terrain making it a practical choice

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

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

Master Airscrew 3.1:1 for S400 RC Aircraft Gearbox - MAS3431 Scatter Terrain making it a practical choiceThe 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