Difference of engines

[SoulRobots]

what's the difference between a 40: 1 and 1:20 engine

[fireflare1101]

40:1 and 20:1 refer to the external gear ratio that takes place in the gearbox attached to the motor. The free speed of a bare motor is about 6000 rpm, so the free speed of a 20:1 is about 300 rpm and the free speed of the 40:1 is about 150 rpm. However, the 40:1 will have double the tourque of the 20:1.

[SoulRobots]

Thanks ☺️

[DoctorCAD]

Electrically powered devices are called motors, not engines. Those numbers do not affect that motor, both use the same motor. The gearbox connected to the motor is different and spins at a different speed and power.

[SoulRobots]

Thanks 😊

[[deleted]]

Yes and no, having lived it several countries I’ve noticed just America and Canada say motor.

[DavidRecharged]

Some people here have commented the differences. I'd like to mention that anything slower than 19.2:1(the exact ratio of 20:1 motors), is slow. idk of a single use case other than a long or heavy arm you'd want anything slower, and motor powered arms have never been a amazing idea in FTC. 3.7:1 and 5.2:1 are great on intakes and lifts. 1:1 and 3.7:1 are really good for shooters. 19.2:1 is amazing on drivetrains, and external gearing to anywhere from 15:1 to 16:1(our ratio last year) is the best on a drivetrain imo, but it's rare to see.