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Re: Prony/pony brakes
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Posted by Jerry/MT on December 08, 2004 at 21:11:22 from (206.183.120.220):
In Reply to: Prony/pony brakes posted by JT on December 08, 2004 at 07:20:51:
A Prony brak consists of a brake band that clamps on a spinning shaft. Connected to the brake band is a lever arm that reacts against a spring scale or a load cell. The shaft is set spinning and the brake band is clamped down till the shaft just begins to slow down. The force is measured at that point as is the rpm and the horsepower is calculated by : HP = rpm x lever arm length x measured force/5252. Needless to say, the answer you get is not too precise. I don't understand how you can get power and torque information from the Baker Fan without a calibration based on measured dimensions, air density, rpm, Reynolds No., etc. You can ceratinly load a shaft with the device but what's the load? buickanddeere suggests a more precise method for determining power directly and toruqe via : Torque = HP x 5252/rpm. My two cents.
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