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SteveC · June 27th, 2009, 14:41

This discussion always cracks me up a little. The numbers are purely arbitrary based on which units of measurement are chosen. It's just a coincidence that pressure (inches of water column) has the same numbers as the first two digits of the rotation speed (revolutions per minute). I have a hard time imagining that the same rule of thumb would have come into being if we were talking about 43 mm Hg and 38 Hertz. Or 57 mbar and 241 radians per second.

They're just numbers.

June 27th, 2009, 14:41	#11
SteveC Ameliorator Join Date: May 2003 Location: GRR Posts: 11,203	Re: Running props over square? This discussion always cracks me up a little. The numbers are purely arbitrary based on which units of measurement are chosen. It's just a coincidence that pressure (inches of water column) has the same numbers as the first two digits of the rotation speed (revolutions per minute). I have a hard time imagining that the same rule of thumb would have come into being if we were talking about 43 mm Hg and 38 Hertz. Or 57 mbar and 241 radians per second. They're just numbers. __________________ . A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila. ~Mitch Ratcliffe