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Tractor Talk Discussion Forum

cutting speed

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raleigh

08-21-2006 18:15:50




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OK assuming I have my JD 4020 for a minute, and I have my 6 foot bush hog,(which I DO have the bushhog) and I was doing some bush hogging. How long does it take to cut an acre of land? I have around 50 acres that needs cutting. So if I know how long it takes to cut an acre then I can scale it to any size tract of land.

Oh and also roughly what is my fuel consumption for cutting that acre?

thanks

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raleigh

08-22-2006 06:40:12




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
WOW this is AWSOME guys!!!
thanks for yalls help.. :)



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Allan In NE

08-22-2006 06:55:59




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 Re: cutting speed in reply to raleigh, 08-22-2006 06:40:12  
Yeah, but Raleigh,

You were kidding 'bout that part where you said you were going to mow 50 acres with that lawnmower, weren't ya? :>)

Allan



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JDknut

08-22-2006 03:59:46




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
Assuming that your effective cutting width is 5 feet (allowing for overlap), then for an acre you cut a strip 43560 sq. ft/acre divided by 5 ft. or 8712 feet long (1.65 miles). If you cut at 4 miles an hour it takes 0.41 hour or 24.75 minutes. But you have to factor in what you are cutting, how sharp the bushhog is, etc. you might have to go slower to get a decent cut in one pass, if you slow down to 2 miles an hour, then it is almost an hour. Not allowing for turns, headlands, etc. WHen starting, your hourly cutting rate is faster than at the end when you are chasing that small patch and have to turn way around the cut area to make another pass at it.

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Tx Jim

08-22-2006 02:22:50




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
MPH X width in feet divided by 10 will give you your answer(acres/hr). Tx Jim



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CNKS

08-21-2006 20:05:30




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
Assume a speed of 4 mph. You can go 4 miles, 5280x4 = 21120 ft in 60 minutes. Using elementary ratio and proportion: 60 min/21120 ft = x/7260 ft. x=20.625 minutes/acre or roughly 3 acres/hr. The 7260 is 43560 sq ft per acre/6 ft cutting width. In other words you have to travel 7260 linear ft to cut an acre with a 6 ft cutting width.Put in some sort of fudge factor for turns, used to know that estimate, but have forgotten, adjust for speed. I'm not responsible for mathematical errors!

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sammy the RED

08-21-2006 20:30:20




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 Re: cutting speed in reply to CNKS, 08-21-2006 20:05:30  
Fudge Factor is useually refered to as efficiency.
80% is normal.



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CharleyFarmall

08-21-2006 20:00:16




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
Well, I am doing Exactly what you are asking to do. It"s taking forever and a lot of fuel to boot. I have done a bit over 30 acres so far and have almost 20 more to do, plus, I need to do a second pass on 16 of them. Get a bigger hog. I"m looking for one that"s affordable but think I am going to get an 88" flail mower. I have not been able to go faster than 4.5mph either and have so far done about 14 hours worth. Hopefully I won"t ever have to bushog Everything again...

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Gerald J.

08-21-2006 19:49:48




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
6' wide 8 mph gives 6 * 8 * 5280 = 253,440 square feet per hour. 100 % efficiency (no wasted time not mowing) gives 253,440 / 43,560 = 5.8 acres per hour. 50 / 5.8 gives 8.6 hours to mow 50 acres.

Based on my 4020 gas, I'd estimate 40 gallons of gas.

Gerald J.



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Robhkent

08-21-2006 18:47:31




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
Raleigh,

I have an 856 I pull a 15 ft Bush Hog with. Mowing in H1 running about 7 1/2 mph I mow just over 10 acres/hr. Keep in mind I am pulling over twice the width you are thinking of, and I have a few more ponies (about 30-40 depending on your 4020) to work with.

Rob



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the tractor vet

08-21-2006 18:31:08




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 Re: cutting speed in reply to raleigh, 08-21-2006 18:15:50  
Well first off putting a 6 footer behind a 4020 is a waste 8 foot and up as you will be wasten fuel at around 3-4 gallon and hour running at PTO speed . Heck a 2010 would play with a 6 footer . And let just say that the ground is smooth as a golf course and ground speed is around 6-8 mph your going to be at it for a couple of long days.



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