Riding Lawnmower Setting up for higher speed
A lawn mower cannot be run too fast otherwise it won't cut the grass properly. Only the outer two inches of the blade (the part you sharpen) does the cutting. The blade must complete a half revolution (come around in front again) for each two inches or less of forward movement.
Meanwhile there is a safe top RPM limit for the blade rotation so you don't have the danger of the blade's shattering from centrifugal force.
Let's say the blade rotates at 3000 RPM.
Equals 50 rev. per second, 100 blade swipes per second, 200 inches forward movement per second, 16.66 feet per second, 59976 feet per hour, 11.36 mph maximum speed.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.
Last edited by AllanJ; 02-21-2011 at 08:48 PM.