Model vehicle vertical drive system

A radio-controlled model vehicle comprising:

• a model vehicle chassis;
• a vertically oriented motor non-rotatively coupled to the model vehicle chassis;
• a rear axle pivotally coupled to model vehicle chassis in a vertical direction via one or more rear axle linkages, and comprising:
• a vertically oriented rear axle differential;
• an extendable driveshaft vertically oriented and rotatively coupling the motor to the rear axle differential and configured to transmit a motor torque from the motor to the rear axle differential, wherein the driveshaft further comprises:
• a driveshaft yoke, slidably coupled along a central axis and fixed in rotation relative to a driveshaft male shaft;
• and
• a first constant velocity joint located at a first end of the driveshaft and coupled to the motor;
• a second constant velocity joint located at a second end of the driveshaft and coupled to the rear axle differential;
• and
• wherein the motor torque powers propulsion wheels coupled to the rear axle via the driveshaft and rear axle differential.

A radio-controlled model vehicle comprising:

• a model vehicle chassis;
• a vertically oriented motor for generating a motor torque, non-rotatively coupled to the model vehicle chassis;
• a rear axle, pivotally coupled to move in a vertical direction, to the model vehicle chassis via one or more rear axle linkages, and comprising:
• a vertically oriented rear axle differential;
• a gear reduction transmission comprising:
• a spur gear comprising spur gear teeth offset from a spur gear center coupling portion;
• and
• a pinion gear powered by the motor and engaged with the spur gear teeth;
• a vertically oriented extendable driveshaft configured to transmit the motor torque and comprising:
• a first end of the driveshaft coupled via a first constant velocity joint to the spur gear center coupling portion;
• a second end of the driveshaft coupled via a second constant velocity joint to the rear axle differential;
• and
• wherein the first end of the driveshaft passes through the spur gear teeth;
• wherein the motor torque powers propulsion wheels coupled to the rear axle via the gear reduction transmission, driveshaft and rear axle differential.