how many rpm is 1 mph?

Question

how many rpm is 1 mph

for a rc motor

Answer 1

Revolutions per minute (abbreviated rpm, RPM, r/min, or r·min−1) is a unit of frequency: the number of full rotations completed in one minute around a fixed axis. It is most commonly used as a measure of rotational speed or angular velocity of some mechanical component. In automobiles it refers to the spinning of the axis and depending on your car the RPM at 1 MPH will be different.

Answer 2

That's a function of three things: your transmission, your differential and your tires.

RPM will increase or decrease at the transmission, depending on which gear you're in. On a conventional five speed, fifth is usually an overdrive, so that the driveshaft will turn more rapidly than the motor. Fourth is usually 1:1, so that the driveshaft turns the same speed as the motor. If you're in a lower gear, the driveshaft will turn more slowly than the motor. To calculate driveshaft rpm, divide the engine RPM by the gear ratio. So that if you have a .80:1 overdrive fifth gear, the driveshaft will turn 1.25 times for each engine rotation.

Next, the differential will lower the driveshaft rpm according to it's gearing. For example, if you have a 3.72 rear axle, divide driveshaft rpm by that to calculate axle rpm. So for every 1.25 turns of your driveshaft, the axle will turn 1.25/3.72 rpm.

Finally, the circumference of the tire will determine how far the car will move per rotation. So multiply the circumference in inches by the above result, to yield inches per minute. To convert this to MPH, divide by 1056.

Within a few minor errors, this is your answer.

Answer 3

1st gear at idle would be about 5 to 10 miles an hour release the brake and see. 700 rpm = 10 miles an hour on level road automatic transmission. That is enough creep to keep you on a small hill at a stop sign so your car doesn't roll backward. Gasoline engines won't idle much slower than 300 rpms.

Answer 4

most likely its idling rpm.

Answer 5

what it idles at