Craig,
Thanks for pointing out this fact. Is their dyno made by Davenport Machine
Service? My printout says it's a Dynojet Model 248C dynamometer. Your idea
about how to calibrate it would work fine, as long as we have a NIST
traceable weight and know the local gravitational field. Of course, the
frictional effects you mention do affect the actual readings, so they would
need to be accounted for somehow. Maybe what's needed is a NIST traceable
power source, something along the lines of the calibrated 347 Jim suggested
we use. (Just kidding of course.)
Bob
At 04:13 PM 3/29/00 -0800, Craig Wright wrote:
>Bob,
>
>If you remember, that is the style of dyno used to test your car last November
>at the Dyno Shop. I believe that one is rated at 1000 hp. I think that the
>flywheel is not very large in diameter, but is long. This would keep the
>stresses down and make it less likely to explode. An easy way to measure the
>moment of inertia (polar, I think) is to apply a constant torque and measure
>acceleration. Gravity can supply the torque by hanging a weight from a wire
>wrapped around the flywheel. Keep the weight small and speeds low to reduce
>aerodynamic effects and you should be able to get within 1%.
>
>Craig
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