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#12
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Re: Ideal robot speed
I'll throw some numbers out to quantify this quickly. Hopefully, this is a real eye-opener for teams who have never done the math. This assumes a 4 cim drivetrain. This assumes you are accelerating from a stop. Someone check my math.... this was thrown together quickly.
Ratio: 4.2:1 Top Speed: 18.02 fps Time to cover 10 feet: 1.18 Ratio: 7.1: 1 Top Speed: 10.60 Time to cover 10 feet: 1.20 Ratio: 10:1 Top Speed: 7.51 fps Time to cover 10 feet: 1.44 Ratio: 12.5:1 Top Speed: 6 fps Time to cover 10 feet: 1.63 The difference between an 18 fps drivetrain (no shifting) and a 6 fps drivetrain over 10 feet is about .4 seconds. Shifting introduces another variable, but you can see where I'm going with this. Erring for a higher gear ratio will rarely leave you disappointed. Due to acceleration timing, a top speed of 10.6 fps is only .02 seconds slower than an 18 fps over 10 feet without shifting. In fact, over 10 feet a robot geared for 18 fps will only hit about 15 fps. This segways into a very interesting argument about when you should design for shifters. Last edited by Tom Line : 23-12-2012 at 01:06. |
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