Posted by MarkB_MI on August 02, 2014 at 03:40:34 from (70.194.10.127):
In Reply to: Some pulley math posted by Notjustair on August 01, 2014 at 10:22:15:
You probably should calculate the blade tip speed. I poked around to see what various ZTR manufacturers publish for spindle speeds and found nothing. But Exmark publishes blade tip speed for all their mowers, and it looks like they shoot for 18,500 feet per minute across the board. A couple of examples:
16.25" diameter blade at 18,500 fpm: (18500 x 12)/(16.25 x 3.1415) = 4350 rpm
21.6" diameter blade at 18,500 fpm: (18500 x 12)/(21.5 x 3.1415) = 3270 rpm
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