robert@honda
Lawn Addict
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- Nov 2, 2011
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For mowers with blades directly connected to the engine crankshaft, here's how to figure the feet-per-minute / blade tip speed:
L = blade length in inches
R = engine speed in RPM
L x R / 3.82
So, a 21" blade, with an engine spinning at 3,100 rpm means:
21 x 3100 / 3.82
65,100 / 3.82
17,042 feet per minute
FYI, most mower companies stay below the ANSI maximum standard, which is 19,000 feet per minute.
L = blade length in inches
R = engine speed in RPM
L x R / 3.82
So, a 21" blade, with an engine spinning at 3,100 rpm means:
21 x 3100 / 3.82
65,100 / 3.82
17,042 feet per minute
FYI, most mower companies stay below the ANSI maximum standard, which is 19,000 feet per minute.