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TheTurfTender
03-19-2008, 06:47 PM
I have a 44" Toro WB Hydro W/Sulky. I think the top speed is around 7 MPH. How do I calculate that time? Assuming 0 trees ;)

davis45
03-19-2008, 06:55 PM
Here you go.

100% efficiency... MPH x width of cut divided by 99=acres per hour

to figure 80% efficiency to give time for turn arounds and not running full speed all the time it is....MPH x width of cut divided by 124=acres per hour

js.lawn
03-19-2008, 06:56 PM
I have a 44" Toro WB Hydro W/Sulky. I think the top speed is around 7 MPH. How do I calculate that time? Assuming 0 trees ;)

i have a 36 its says about 4.4 per hour

corey4671
03-19-2008, 06:59 PM
Here you go.

100% efficiency... MPH x width of cut divided by 99=acres per hour

to figure 80% efficiency to give time for turn arounds and not running full speed all the time it is....MPH x width of cut divided by 124=acres per hour

is the width in feet or inches?

davis45
03-19-2008, 07:02 PM
inches...that came from exmark's website

AnthonyLandscaping
03-19-2008, 07:11 PM
Bottom of this page has a table also....
it's what i used when I first started :D

http://www.ktoutdoor.com/exmark_z_page.htm

1wezil
03-19-2008, 07:21 PM
now we need speedometer on the mowers and we will have it all figured out..lol

echeandia
03-19-2008, 07:29 PM
i have a 36 its says about 4.4 per hour

Something is wrong with your math.

Lawn Pawn
03-19-2008, 11:14 PM
http://www.dejongequipment.com/Acres%20Per%20Hour%20Mowed.pdf

corey4671
03-19-2008, 11:31 PM
Something is wrong with your math.

yeah I thought that too when I read that :confused:

mx495
03-20-2008, 12:01 AM
http://www.dejongequipment.com/Acres...ur%20Mowed.pdf

On the bottom that one says "includes rest breaks."


wierd

TomberLawn
03-20-2008, 12:45 AM
the 36" cutting 4.4 acres would have to be going over 12mph at 100% efficiency.

For your 44" wb, 100% is 3.1 acres an hour, but that's unattainable. In pretty close to real world conditions, you should be able to mow about 2.5 acres an hour, given 80% efficiency to account for overlap and turning. That comes down to 24 minutes for 1 acre.

BeautifulBlooms
03-20-2008, 01:24 AM
I do mostly 1/2 acre properties or less meanign the sq. ft. of turf is anywhere from 8000-25000. I have averaged between 700 Sq. Ft. per minute up to 1100 sq. ft. per minute with a 52" Zturn.

I believe this is telling me I am going 4 MPH and have an average efficiency of about 50-65% dso dont listen to the dealers or manufacturers that want you to believe you can go at 80% efficiency. I could expect that on wide open turf and only if there was an acre or more!!!

If you need help with the math I have forumulated a spreadsheet that has sq. ft. per minute, per hour etc based on deck size and average speed and it also has 5 efficiency factors ranging from 50-100& I can forward that to you if you want.

howardsells2000
03-20-2008, 01:57 AM
I don't have all of these formulas but from my experience with walk behinds and velke's I think it will take you about an hour or maybe a little longer.

BeautifulBlooms
03-20-2008, 02:02 AM
If anyone wants a spreadsheet with 21" 36" 48" 52" 61" 72" breakdowns from 35% efficiency up to 100% efficiency assuming speeds of 3MPH, 4MPH, and 5MPH

I would be happy to email it to you. Just PM or email me for a copy and include your email address. You can plug in the square footage of the lawn you are bidding, and from there it will do all calculations all you have to do is figure out how technical the property is!

Oldmarine
03-21-2008, 08:28 PM
Josh(at)AllNationsMGMT.com

thanks

Lawn-Sharks
03-21-2008, 09:28 PM
If anyone wants a spreadsheet with 21" 36" 48" 52" 61" 72" breakdowns from 35% efficiency up to 100% efficiency assuming speeds of 3MPH, 4MPH, and 5MPH

I would be happy to email it to you. Just PM or email me for a copy and include your email address. You can plug in the square footage of the lawn you are bidding, and from there it will do all calculations all you have to do is figure out how technical the property is!

Can you mail me one. my eamil is Lawnsharks@yahoo.com thank you!

Roger
03-21-2008, 09:43 PM
... I think the top speed is around 7 MPH. ...

Maybe top speed of the mower is 7 mph, but what is reality? Unless you are mowing grass from cracks in the pavement, most lawns are too rough to never reach top speed. Your 44" machine will be a little heavier and a little more stable than my 36". In my experience, anything over 3.5mph is rare. I use a two wheeled sulky. I have to have some very smooth turf area, long runs, etc, to reach 4mph.

No, I don't have a speedometer. But, I do know how fast I walk (measured with stopwatch). With a sulky I can move a bit faster, 0.5mph, but that's about it. The mower needs to be handled, kept on course, and turned. None of us are mowing highway median strips for miles, rather lawns that require turning a couple of times per minute, trees, island beds, walks and driveways to mow around.

I consider 1 acre per hour as near the top, on some properties, a little more, but less than 1.5. After 10 seasons, I just cannot do any better.

Gareth
03-25-2008, 06:44 AM
If anyone wants a spreadsheet with 21" 36" 48" 52" 61" 72" breakdowns from 35% efficiency up to 100% efficiency assuming speeds of 3MPH, 4MPH, and 5MPH

I would be happy to email it to you. Just PM or email me for a copy and include your email address. You can plug in the square footage of the lawn you are bidding, and from there it will do all calculations all you have to do is figure out how technical the property is!

Hi there, please e-mail me that data.

Gareth.thompson97(at)ntlworld.com

Thanks a lot :-)
Gareth.

JShe8918
03-25-2008, 12:26 PM
his math is correct. He just misunderstood it. That is how many acres per hour you can mow instead of the time you can mow it in.

milkie62
04-07-2008, 01:36 AM
The Toro brochure has all the charts

JustAGlimpseLawnCare
04-07-2008, 09:17 PM
44"/12" x 5280' x 7 MPH = 135,520 sq. ft.
1 Acre = 43,650 sq. ft.

135,520/43,560=3.11 @ 100% efficiency

2.80 ac. @ 90% efficiency
2.49 ac. @ 80%
2.18 ac. @ 70%

I'd have to second TomberLawn's numbers at approximately 2.50 acres per hour, or about 24 minutes per acre.

Carolina Cuts
04-07-2008, 09:23 PM
How Long Will An Acre Take Me??????
I have a 44" Toro WB Hydro W/Sulky. I think the top speed is around 7 MPH. How do I calculate that time? Assuming 0 trees

This question is bringing back bad 5th grade math memories. I must've been sick that day cause I don't have a clue.

BeautifulBlooms
04-07-2008, 09:31 PM
44"/12" x 5280' x 7 MPH = 135,520 sq. ft.
1 Acre = 43,650 sq. ft.

135,520/43,560=3.11 @ 100% efficiency

2.80 ac. @ 90% efficiency
2.49 ac. @ 80%
2.18 ac. @ 70%

I'd have to second TomberLawn's numbers at approximately 2.50 acres per hour, or about 24 minutes per acre.

This is correct in its math but incorrect in the ability to mow at 7 MPH and definitely in your ability to mow at 90, 80, or 70% efficiency.

Could it be done that fast??? maybe, but done professionally and with care and concern for the property no way!

I have found using a 52" Ferris IS1500 I can do about 700-1100 sq. ft. per minute (based on a typical home of 10-20K sq. ft. which is a range of 42,000-66,000K per hour.

I use efficiency factors to come up with my pricing and what I end up using assuming my 52" deck size and 4 MPH that I fall somewhere between 40-60% efficiency compared to if I mowed in a straight line for 1 hour. If this doesnt help, please email may as I mentioned above I have a spreadsheet that can give you solid numbers. I am not you and I may not mow like you but it will be a good starting point at least. At least you wont be underbidding everything thinking you can mow 2 acres per hour with a 44" mower!!