The Baker Fan

| January/February 1975

1961 West Side Drive, Rochester, New York 14624.

Retired Project Engineer in charge of air flow and pressure standards for the Taylor Instrument Cos. and author of 'The Engine Wasn't There', 'Of Engines, Governors and Nomenclature', and other articles.


The Baker Fan was developed by the Baker Co. as a load for running-in new engines and not as there seems to be a tendency to expound at the Reunions, as a device for the measurement of horsepower. There are two reasons why these fans are inadequate for such use. First, their performance is air density dependent, and second, the speed is relatively insensitive to the power input.

At higher elevations, the air is rarefied (less dense) and the fan spins more easily. Therefore, the power input to the fan would be less for the same rate of turning.

The normal air pressures at different altitudes are well known. From those values, I have calculated the change in air density with altitude and, in turn, the change in the amount of power required to drive the same fan at the same speed at three specific locations. If 50 horsepower were required to drive a fan at a particular speed at Rochester, N. Y. altitude (510 ft.), then only 48 horsepower would be needed drive the same fan at the same speed at Olean, N. Y. altitude (1438 ft.) and 40 horsepower would suffice at Denver, Col. altitude (5219 ft.).

2/8/2015 7:23:20 PM

Hello I was looking at the slotting jig for the baker monitor windmill my fan was destroyed in a Iowa wind storm was hope someone had greater details of the jig like the angles and double compound angles what kind of saw to use to make it on and so on please help thanks mat

1/30/2015 10:51:35 AM

Hello, I am looking to buy a baker fan. Can anyone please help me out? Thanks, Jacob Mattson


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