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Spockie-Tech
Site Admin

Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia

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step 1 - 6000 revolutions per minute * 60 minutes per hour = 360,000 revolutions per hour.
Step 2 - Divide Motor Rpm / Gear Ratio (10:1 = /10) = 36,000 wheel revs per hour
step 3 - 10 inches wheel diamter = 25.4 cm wheel diameter
(please keep units constant, dont work with tyre diameter in inches (imperial) but ask for speed in metric (kilometers)
step 4 - 25.4cm diameter * Pi (3.1415) = 79.79cm circumference (Circ = Pi *D)
Step 5 - 36,000 revolutions per hour * 79.79cm circumference = 2,872,440 cenitmeters per hour
Step 5 - didive 2,872,,440 by 100 (centimeters to meters), and again by 1000 (meters to KiloMeters) = 28.724 KiloMeters per hour.
So, Approximately.. Yes, looks like you got your maths right, well done.
Thats not taking into account wind resistance, drive train gear losses, battery voltage drop, Thermal heating of wires increasing circuit resistance, tyre diameter growth due to rotational forces, inertial acceleration factors, the friction coefficients and drag of the tires, and several thousand other factors that may invalidate the accuracy of these calculations..
(ask a simple question that has been explained before, get a deliberately over-complicated answer.. ) _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Sat Nov 27, 2004 5:45 pm |
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