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Re: Minibot climb rate
Quote:
Originally Posted by Chris Hibner
This calculation is actually very easy using the work-energy thorem.
Power = Work / Time
Work = weight * height
Therefore:
Time = (weight * height) / Power
Example:
Motor power: 8.43 W (Tetrix motor)
Efficiency: 0.85
Weight: 5 lb * 4.4545 N/lb = 22.27 N
Height to climb: 2.1 m
assume gearing for peak power.
then:
Time = (22.27 N * 2.1 m) / (8.43 W * 0.85)
Time = 6.53 sec
This is the FASTEST time. If you make the wheel big enough that the torque on the motor causes the motor to move away from the peak power point, the minibot will climb SLOWER, not faster. In other words, bigger wheels aren't always better.
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I looks like your numbers and mine are spot on. I took a different approach, but the result is the same within .1 seconds. 
Just so others can see where I got my numbers, I ran it through the JVN Calculator.
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