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What Gear

Inertia??

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phil

05-18-2002 07:51:19

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How big a factor is the speed of the Pull? I get my best pulls by running my JD in creeper gear at about 1/3 throttle during the last 30 feet. But others run in higher gears that are closer to the 4 MPH limit. How important is inertia? It seems like, if you were to hit the clutch when you're about 75% thru the Pull, you would only 'roll' about 1 foot, is that right?

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Steve V

05-19-2002 18:24:21

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Re: What Gear - Inertia?? in reply to phil, 05-18-2002 07:51:19

Well, Phil, here' my theory. When I pull in first gear I'm focused on nothing but the track and I'm moving so slow I have time to second guess myself and make corrections. When I pull in 2nd gear I'm a little concerned about power so I may have my hand close to the clutch while watching the track which is now moving twice as fast under me as when I pulled in 1st gear. How's life in the desert? We have flood problems here in the midwest.

Steve

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mo speed

05-19-2002 08:00:09

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Re: What Gear - Inertia?? in reply to phil, 05-18-2002 07:51:19

Speed is a very big factor. Momentum= weightxvelocity. It takes 4x the power to go only twice as fast.
The main reason you can shift up is your J pop's 2 cylinders don't hit often enough. By idling back you cut the speed down and the torque is flat so the old thing can labor along with the load.

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phil

05-19-2002 11:06:12

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Re: Re: What Gear - Inertia?? in reply to mo speed, 05-19-2002 08:00:09

Mo, I see what you mean "It takes 4x the power to go only twice as fast." With my B J.D. in creeper gear, I am using the other side of that - it only takes 1/4 the power to go half as fast. But does that cut down the Pull Distance?

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Do not believe everything that you read...

05-20-2002 08:03:50

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Re: Re: Re: What Gear - Inertia?? in reply to phil, 05-19-2002 11:06:12

If you do not believe me, please find a Physics book and verify:

Power = Work / Time and Work = Force * Distance so....

Power = (Force * Distance)/ Time

There is nothing exponential about this relationship. Power is linearly related to speed. It takes twice as much power to go twice as fast.

Mo is confusing energy's relationship to speed: Kinetic energy = (1/2) Mass * Velocity^2; Here twice the velocity will give you four times the energy.

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Slo

05-19-2002 05:02:44

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Re: What Gear - Inertia?? in reply to phil, 05-18-2002 07:51:19

I think lot of it depends on the sled. If the sled pan has grousers on a trip system to stop the hot stuff, it will usually stop the slow movers in a shorter distance.

I've pulled in the farm classes in low with my antique, for fun, and with most sleds once the grousers drop it's just a matter of a few feet for me, while the faster machines rolled a little further. On some of the sleds that used more weight in the box and didn't have aggressive grousers, I did all right in that I usually had a good balance of power and traction in low.

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ken

05-18-2002 18:34:58

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Re: What Gear - Inertia?? in reply to phil, 05-18-2002 07:51:19

I pull my JD 60 in first or second gear and dont see much difference in distance.I think as long as you are 4 MPH or less it dont make much difference, but over that speed I believe it does. Sometimes 1 inch is all it takes to win.I have found that getting the weights right is more important than speed.

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JOhn

05-18-2002 20:20:46

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Re: Re: What Gear - Inertia?? in reply to ken, 05-18-2002 18:34:58

You gotta have speed to carry you through the holes and humps in the track!!!
John (JD man gone yellow:D)

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ken

05-18-2002 18:32:44

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Re: What Gear - Inertia?? in reply to phil, 05-18-2002 07:51:19

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