21" Feet Per Second

Discussion in 'Lawn Mowing' started by MowHouston, Feb 27, 2008.

  1. MowHouston

    MowHouston LawnSite Bronze Member
    Posts: 1,012

    Anyone have an estimate or know how fast they move with a 21"? Trying to do a bunch of useless calculations. I estimated 2ft per sec.

    Not looking for sq ft, I can do that on my own. How fast do you move forward?

    Anyone else?
     
  2. 2.2346777777777 feet per second.
     
  3. TomberLawn

    TomberLawn LawnSite Bronze Member
    Posts: 1,299

    I go close to 5 fps with my Lawn-Boy. It has a top speed of 5mph, but you'd have to jog to keep up with it. After figuring in tight area trim and turns, I probably average 3.5 to 4, but in open grass, I can go over 5 fps.
     
  4. JimQ

    JimQ LawnSite Bronze Member
    Posts: 1,139

    The math end of it. Not reality.

    4 mph =

    5280 feet in a mile

    4 x 5280 = 21120 (feet per hour)

    21120/60 = 352 (feet per minute)

    352/60 = 5.8666 (feet per second)

    Q
     
  5. MowHouston

    MowHouston LawnSite Bronze Member
    Posts: 1,012

    Yeah. I ended up with the estimate of 2 feet per second which translates into 175 square feet per minute.

    I subtracted 15% of the square ft per minute to compensate for turnarounds and obstacles.

    I just have a crappy Troybilt mower, not even a commercial mower, so I'm sure it is much slower than you other guys.

    It is getting replaced by a 32" this summer.
     
  6. TomberLawn

    TomberLawn LawnSite Bronze Member
    Posts: 1,299

    I have a couple long, straight yards that I actually do run close to wide open. I got tired of jogging to keep up, though, so I got a 33" walk behind now for those. It's a little slower (about 4mph in 4th gear, which is about the only gear I use) but the width makes it a lot more productive.
     

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