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Discussion in 'Starting a Lawn Care Business' started by CP Estates, Mar 3, 2006.
Why such a difference? The Gravely is a 60" with a 25hp and the Ferris is a 61" with a 25hp.
The equation for finding acres per hour is "Ground Speed X Deck Width / 99 for 100% efficiency (which is impossible) or /120 for 80% efficiency."
The Gravely goes 13 mph and the Ferris you mentioned only has a top speed of 10 mph. Ferris used 80% efficiency in their equation, while Gravely used 100% efficiency in theirs.
13 mph X 60" deck / 99 = 7.8787...
10 mph x 61" deck / 120 = 5.0833...