Quote:
Originally Posted by Ether
That extrapolates to 4400 rpm, not 5200. No?
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A linear extrapolation gives me 4900 rpm (using excel's questionable fit, not sure if its lsq or what), but we guessed it should be following a quadratic trend (since we are increasing the voltage, but keeping the load the same), so that put us (forcing an intercept of 0) at 5200. The fits would be better if we included the origin as a data point (since it does, in fact, not spin, with no voltage applied...). In any case, the numbers are close enough for our purposes - we are happy to be within 20% right now (if this were for my lab, however, it would be a different story).