Lego Technic New 12/20 Gear High Speed Friction Test

The Lego Technic set 42140 App-Controlled Transformation Vehicle introduces two new gears - a flat version of the 12 tooth bevel gear and a flat version of the 20 tooth bevel gear. These gears are designed to have less friction.

In this follow up video I measure the high speed difference in friction between the new 12 and 20 tooth gears and the current bevel versions of these gears by running a high speed experiment with an up gearing of fifteen times.

In this experiment a symmetrical mirror image setup with two motors is used, where one motor drives a gear train using the bevel gears and the other motor drives an equivalent gear train using the new flat versions.

The speeds of the motors are compared using a differential and the relative torque loss calculated using the linear motor relationship between speed and torque.

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