# 21" Feet Per Second

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

1. ### MowHoustonLawnSite Bronze Memberfrom Houston, TxMessages: 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. ### JB1LawnSite Fanaticfrom From the hills of beautiful Southern IndianaMessages: 5,903

2.2346777777777 feet per second.

3. ### TomberLawnLawnSite Bronze Memberfrom Monroe, NCMessages: 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. ### JimQLawnSite Bronze Memberfrom Beatrice, NEMessages: 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. ### MowHoustonLawnSite Bronze Memberfrom Houston, TxMessages: 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. ### TomberLawnLawnSite Bronze Memberfrom Monroe, NCMessages: 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.