How Much HP needed?

[Gene Stevens]

I have a 12'IH #9/10 drag tandom disk. How much HP do I need to pull it? Thanks Gene

 

[johns48jdb]

depends on several things. land type, how heavy the disk is. does it have scalloped blades on it that will go deeper than smooth blades. how fast you want to go with it. condtion of tractor motor. tire wear. i would want at least 90 hp to be able to walk on with it.

 

[Anonymous-0]

I have used a John Deere Disc and ran with it running a 48 horsepower John Deere R in 3 and 4 gear, and that is with the wheels off the ground.

 

[thurlow]

IMPOSSIBLE to answer; I'm not familiar with the disk, but around 'here', a cutting (as opposed to pulverizing) 12 ft. disk would need about 90 HP. I'm sure other folks pull them easily with a "Super C" Farmall.

 

[paul]

Around 40-50 hp; more in tough conditions, less in fall when disking firm bean stubble.

--->Paul

 

[DoubleR]

I've heard it said they figure about one and a half hp. per disk blade on a average. I have found that to be pretty acurate.

 

[Hugh MacKay]

Gene: I'm assuming you are talking about IH model No. 9 or 10. It isn't going to require as much horsepower as some of these guys believe. To start with in the days of 9 or 10 disk, 16" blades were the large blades. Huge difference between those and 18" or 20" blades, many of these guys are using today. Those old disks just don't have the weight for deep penetration, especially not with 18" or 20" blades.

The 9 or 10 would have had cast iron bushing type bearing, maybe even wood. When that disk was new and given the bearings, farmers would have been content to use an M, W6 or W9 in 2nd or 3rd gear. Another thing to remember, when new these old disks followed the moldboard plow.

 

[sammydwm]

Back in the day we'd pull that with the 8N. We saved the Super C for the big jobs.

 

[Gene Stevens]

I have a TO 20 and it is all it can do to pull in 1st with full throtle. I have a Farmall H that is not running but hope to have it going soon. It is just about the same HP. Thanks for the replies.

Gene

 

[Hugh MacKay]

Sammy: Do you expect us to believe that. Any of the 8N's I've ever been around would have trouble pulling a 12' disk with gangs angled straight.

 

[sammydwm]

I'm sorry I forgot to add the winking smiley

;-)

to denote that I was fooling around with a post further up.

 

[Leroy]

Those are drag type disks and no carry wheels that several posters are talking about and would not have the cutout blades. It will be too much fot the Farmall H tho as they were designed to pull a 8' disk and that Ferguson was designed to pull a 7' disk. What you need for that disk is a Farmall M as that is what that disk was sold for use with. In other words your tractor when new was rated at 27 Max PTO HP and the M was rated at 27 Max PTO HP. THe Super C Farmall was rated at 25 Max PTO HP. And that 25 is about right for the Ferguson 20 but the weight placement and gear differences will make a S C seem like it has more power with a drag type inplement like a disk.

 

[sammydwm]

What does PTO HP have to do with dragging around a disc?

 

[Leroy]

That is the way tractors are rated by PTO horse power first and secondly some rated by drawbar horsepower but most people know what size a tractor is by the PTO HP but do not know what size it is if you say drawbar HP.

 

[Hugh MacKay]

sammy: Drawbar horsepower will be in the vicinity of 85% to 95% of PTO hp so it's all relative, as one goes up so will the other.

Coupled with hp, you need weight to pull drag type implements.

 

[sammydwm]

I know all that, just wondering why PTO HP was mentioned, coulda just said ....HP

 

[Leroy]

There is quite a difference between Max PTO HP and rated drawbar HP and some people like to use the latter while the manufactur used the first and on an M Farmall there is close to 15 HP difference in those 2 figures