The weighted RPM and weighted top speed show the respective values with efficiency factored in. About 70% efficiency is the average.

**Whole numbers only (no decimal points or symbols).**

## Battery & Motor | ## Gearing |
||

Number of Lipo Cells (S count) | Motor Pulley Teeth | ||

Motor kV | Wheel Pulley Teeth | ||

Efficiency (%) | Wheel size (mm) |

## Calculations |
|||

Battery volts | Gearing ratio | ||

Motor RPM | Top Speed | ||

Weighted Motor RPM | Weighted Top Speed |

Thank you. This has been invaluable.

ReplyDeleteI was curious to learn whether there is some some way to compare a 5M tooth to a 3M tooth, or is it based on wheel diameter?

The calculator is based on wheel diameter.

DeleteA 3M or 5M belt by itself should not make much of a difference in speed.

You would have to choose a belt based on the size of the pulleys you're using. A 3M belt will allow you to use a smaller motor pulley because the tooth pitch is smaller.

Hey so what is generally a good gearing ratio for a nice balance of speed and torque? some where around 2.5 to 1?

ReplyDeleteI'd say it depends on how strong your motor is. If you have a stronger motor, you could have a ratio closer to 2:1. I think 2:1 is the lowest ratio you should use for getting a higher top speed - anything lower may be too much for the motor to pull. 2.5:1 sounds like a good balance.

DeleteIt would also depend on how much hills/inclines you'll regularly need to climb.

This is a excellent tool.

ReplyDeleteGreat short cut for off the cuff ideas and folks who even if they can do the math don't do it often enough to be confident in the results.

Great way to compare different recipes for modifications and builds.

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ReplyDelete