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RC models by Robert Holsting

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Finding vehicle speed and power:

This tool can help you calculate the speed and power of your vehicle, or by trail and error the required gearing or other data.

Note that it is possible to input a safety factor in order to compensate for rolling resistance and mechanical loss etc.

You can work your way towards the perfect values by changing gearbox gearing, rpm, wheel size and so on, one value at the time.

User inputs: ( Decimal point = komma )
Input maximum motor speed rpm
Input maximum motor torque Ncm
Input tire diameter cm
Input gear ratio, differentials ("1" = off) :1
Input gear ratio, reduction / distributor ("1" = off) :1
Input gear ratio, gearbox 1. gear ("1" = off) :1
Input gear ratio, gearbox 2. gear ("1" = off) :1
Input gear ratio, gearbox 3. gear ("1" = off) :1
Safety margin / mechanical loss etc. ("1" = off) factor
     
Calculations:
Tire circumference
3,1
cm
Tire radius
0,5
cm
Motor power, watt ( = kg/m * rpm)
0,0
watt
Motor power, horsepower (1 hp = 746 W)
0,0
hp
 
 
Results: Vehicle power:
N
kg
 
1st. gear
N/A
N/A
 
2nd. gear
N/A
N/A
 
3rd. gear
N/A
N/A
 
 
 
Results: Vehicle speed:
m/s
km/h
 
1st. gear
N/A
N/A
 
2nd. gear
N/A
N/A
 
3rd. gear
N/A
N/A
 
   

This service is free of charge. I cannot be held responsible in any way. Use at your own risk.

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