Calculator

Inputs

Battery Voltage (v)
Wheel Diameter (in)
Motor kV
R_int (ohms)
Gearbox Ratio
External Gear Ratio

Output

Rotary Output

Gearbox Free Speed
Gearbox Stall Torque

Linear Output

Linear Free Speed
Linear Stall Force per side
Linear Stall Force net

---

Reference

Common Brushless Motor Specs

Click "use" to apply motor specs to calculator.

	Motor	kv	Rint	Notes
Use	SK3 2118	3100	0.22	2mm shaft
Use	BE1806 Race Edition	2300	0.19	Purple, 2mm/3mm stepped shaft

ServoCity 22mm Gearmotor Ratios

Click "use" to apply gearbox specs to calculator.
Green ighlighted rows indicate gearboxes that are confirmed compatible with Botkits' 13t pinion gears.
Red highlighted rows indicate a different sized pinion requiring a transplant from the stock motor. Unhighlighted rows are unconfirmed.

	RPM	Ratio	Pinion
Use	26RPM	455:1
Use	32RPM	370:1
Use	38RPM	316:1
Use	44RPM	270:1
Use	52RPM	231:1
Use	116RPM	104:1
Use	142RPM	84:1
Use	195RPM	62:1	13t
Use	280RPM	43:1	13t
Use	350RPM	43:1	13t
Use	416RPM	19:1	13t
Use	520RPM	19:1	13t
Use	624RPM	19:1	13t
Use	730RPM	19:1	13t
Use	2737RPM	4:1