H & M slow first gears.

dej(Jed) · Oct 15, 2013

Okay, so pullers look for H & M's with slow first gears. Essentially that creates a gear reduction scenario, correct? So if you change out a 3 mph gear and replace it with a 1 mph, haven't you effectively more than doubled your applied HP?
NO YOU HAVEN'T DONE ANYTHING TO THE ENGINE HP..
LOL.

PretendFarmer · Oct 15, 2013

Say what you will. On good hard tracks, I outpull any H. Not even close. Never said anything about doubling HP but overall tractor pulling power is vastly increased.

PretendFarmer · Oct 15, 2013

and just to be clear, I am talking stock classes. Not enhanced 80hp H's.

John G. Hasler · Oct 15, 2013

> On good hard tracks, I outpull any H. Not even
> close. Never said anything about doubling HP but
> overall tractor pulling power is vastly
> increased.

Draft is increased because you are delivering more torque to the wheels (but the same amount of power). Perhaps pulling contests should be held in plowed fields. Might bring back steel wheels.

PretendFarmer · Oct 15, 2013

Every track essentially has different requirements to pull good.

Smitholm · Oct 15, 2013

Horsepower is defined as the pull required to move the load multiplied by the speed at which the load is being moved. So, for the same horsepower (same motor), if the speed is reduced, the pulling capability is increased proportionately. So, for example, if the ground speed is reduced by half by changing gearing, the pull is doubled, assuming that the traction is sufficient to support it.

Janicholson · Oct 15, 2013

A 3 hp Briggs and Stratton will make a full pull in the 12000# weight class if you put it on a massive very good traction chassis, and give it 30 days. The HP is a timed event, and not changed by gears. Jim

778899m · Oct 15, 2013

IT TAKES FOUR TIMES THE POWER TO GO TWICE AS FAST,remember in school,exponentially

778899m · Oct 15, 2013

PF,HOW PROFOUND !!!!!!!!!!!!!!!!!!

John G. Hasler · Oct 15, 2013

work = force X distance
power = work / time
Thus
power = force X distance / time

speed = distance / time
Thus
power = force X speed

Therefor doubling speed at constant draft (i.e. force) requires doubling power.

FBH44 · Oct 16, 2013

A horse-power is 33,000 ft.-lbs. per minute. They came up with that number long ago by testing good draft horses. A good draft horse working his heart out, with enough leverage, could hoist water out of a mine shaft at a rate of lifting 33,000 lbs. of water up, at a rate of one foot per minute. OR he could raise 16,500 lbs. at a rate of 2 feet per minute. OR he could raise 8,250 lbs. 4 feet per minute.
Conversely, the old boy could also lift, say 100,000 lbs. at a rate of 33/100 = 0.33 feet per minute. Old boy could lift the Empire State Building, but real slow, like 2013 and most of 2014.
Old boy cranks out the same power HP, but his leverage and time are directly related. You want him produce a lot more leverage, it'll take him a lot more time.

778899m · Oct 16, 2013

John,Go to BONNEVILLE SALT FLATS and see if the boyz can double their speed with only double hp??????????? AIN'T HAPPIN'N

PretendFarmer · Oct 16, 2013

(quoted from post at 10:32:26 10/16/13) John,Go to BONNEVILLE SALT FLATS and see if the boyz can double their speed with only double hp??????????? AIN'T HAPPIN'N

Your awful dramatic....

John G. Hasler · Oct 16, 2013

> Go to BONNEVILLE SALT FLATS and see if the boyz
> can double their speed with only double hp?

At those speeds they are dealing primarily with aerodynamic drag, which is proportional to speed squared. Quite different from a tractor pulling a fixed load at low speed.

dej(Jed) · Oct 16, 2013

(quoted from post at 05:06:52 10/16/13) > Go to BONNEVILLE SALT FLATS and see if the boyz
> can double their speed with only double hp?

At those speeds they are dealing primarily with aerodynamic drag, which is proportional to speed squared. Quite different from a tractor pulling a fixed load at low speed.

Come on compare apples to apples. Go watch Fast & Loud on cable TV.

mkirsch · Oct 16, 2013

Technically you do not change the horsepower, but people commonly use the word "horsepower" when they really mean "force."

You're not going to change that people use words "incorrectly." Just learn to live with it.

Janicholson · Oct 16, 2013

I get paid to not live with it. I spend substantial time each day teaching what is reasonably likely to be the truth, and regrooving the wrong ideas implanted (or self made) that come into my classes on the "hoof". Jim

778899m · Oct 16, 2013

well then go plow and double your speed and see how far you get,same principle,sameo samo,need much more than double!!!!!!!!!!!!

John G. Hasler · Oct 16, 2013

> well then go plow and double your speed and see
> how far you get,same principle

No, not the same principle. When plowing you are lifting dirt so part of the drag force is going to be roughly proportional to speed.

778899m · Oct 17, 2013

some of you just don't get it,you admit the dirt moves plowing,dah! the wind drag going fast,Dah !!!! I SUPPOSE THE PAN HAS NO DRAFT??????????DOUBLE DAH! OH FOR SOME IT IS TRIPLE DAH.

PretendFarmer · Oct 18, 2013

You argue like a abundant.

dej(Jed) · Oct 18, 2013

Lordy Lordy Lordy..... The insanity continues.........

H & M slow first gears.

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