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Mower Production Question

Discussion in 'Lawn Mowing Equipment' started by larryinalabama, Aug 12, 2017.

  1. larryinalabama

    larryinalabama LawnSite Fanatic
    Messages: 19,463

    How much faster would a 60" mower compared to a 48".

    Im figuring its 20% "more" mower so 20% faster. That equates to 12 minutes per hour.

    Am I even close?????
     
  2. StanWilhite

    StanWilhite LawnSite Silver Member
    Messages: 2,382

    Hey Larry, since 12" is 25% of 48" I'd think the answer would be 25% faster (15 min/hr gained)...that's in a wide open field. This of course would depend on all other variables (speed, overlap, etc) being the same. In other circumstances you'd have to factor in obstacles that maybe you could get around/between with a 48 that you couldn't with a 60, resulting in the need for more trimming.
     
    larryinalabama, hort101 and Dawson like this.
  3. dishboy

    dishboy LawnSite Fanatic
    from zone 6
    Messages: 6,109

  4. Mow-Daddy.com

    Mow-Daddy.com LawnSite Gold Member
    Messages: 3,698

    48÷12 is equal to 1/4th or 25%
    But 60÷12 is equal to 1/5th or 20%
     
    Ridin' Green and larryinalabama like this.
  5. StanWilhite

    StanWilhite LawnSite Silver Member
    Messages: 2,382

    Yep, mowing 25% faster. The difference is figured off of the original mower....not the secondary.
     
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  6. StanWilhite

    StanWilhite LawnSite Silver Member
    Messages: 2,382

    Don't know if this will make things clearer or if it will just be more confusing, but you always use the reference number (48" mower in this case) as the "base number".

    It's all in what you're comparing to what. Which is the "base" and which is the "comparison".

    So, since 12 is 25% of 48, a 60" mower is 25% faster than a 48" mower.

    Going the other way, if you're comparing how much slower a 48" mower is compared to a 60" mower, the "base" is the 60" mower. So, a 48" mower is 20% slower than a 60" mower.

    The 12" strip of grass difference is 25% of the 48" deck, but only 20% of the 60" deck.
     
    Last edited: Aug 12, 2017
    Grassholes likes this.
  7. TPendagast

    TPendagast LawnSite Fanatic
    Male
    Messages: 10,657

    There's some mow calculators on line that are close enough for horseshoes, handgrenades and government work.

    But
    This only works if we're talking about properties a 60" belongs on.
    Contrary to the logic proliferated by this sites founder, the 60 inch will not best a 36 or 48 on every square inch because its larger.
    This is because it's a fat lady in a china shop trying not to knock everything over with her hips.
    Not to mention a foot wider means the grass discharge is a foot farther to the right meaning the difference between grass in the beds and not.

    So it's all armchair mathematics if a sane , experienced operator/professional isn't using the right tool for the right job.

    When you're in the 60s play ground (wide open)
    Figure the 48 will mow 2.25 acres of landscaped turf.
    Where as the 60 can produce 3.55 acres.
    This is assuming 90 percent efficient on landscaped resi or medium commercial in ideal condition without going "full speed"

    Now on the other hand, in tight tricky landscaping where there is more turning and maneuvering

    The 60 will produce 2.18 acres and the 48 will produce... 2.18 acres

    On the literal "rectangle of flat grass"

    The 60 will give you 5 acres to the 48s three acres per hour.

    It's all relative to what you're trying to cut.
     
  8. TPendagast

    TPendagast LawnSite Fanatic
    Male
    Messages: 10,657

    The majority of 60s are set up so they go faster than their 48" counter parts and because of their deck width they also turn less times doing a rectangle than a 48.
    So the math is a little more involved than just the percentage of deck width increase.
    As I mentioned above, if you cram the 60 into an area where it's turning more than the 48 because of its size, there is no increase at all.
     
  9. StanWilhite

    StanWilhite LawnSite Silver Member
    Messages: 2,382

    That's why I specifically made mention of a "wide open field", and "adjustments" in the figures that would have to be made if that wasn't the case. I also stated "all other variables being the same"...as in "overlap and speed". Maybe that wasn't clear enough?
     
    Last edited: Aug 12, 2017
  10. puppypaws

    puppypaws LawnSite Fanatic
    Messages: 9,168

    Given equal power to operate at the same speed, a 60" deck will be 20% more productive that a 48" deck.

    A mower with a 60" deck operating at 10 mph using a 70% efficiency factor (turn-around time and getting back to full mowing speed) will cut 4.24 acres per hour. A mower with a 48" deck utilizing the same speed and efficiency factor will cut 3.39 acres per hour, which equates to 20% more cut by a 60" mower versus a 48" mower. Your 12 minutes more time to cut with a 48" deck what a 60" deck will cut per hour, is correct.
     
    larryinalabama likes this.

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