Posted by ss55 on November 03, 2014 at 07:53:44 from (173.28.18.88):
In Reply to: tractor math posted by T in NE on November 02, 2014 at 22:19:56:
Statics is the science you are looking for. Dynamics is the science to use if you want to include how wheel torque, drawbar pull, momentum, changing inclines, acceleration, turning, etc. all have an affect while moving.
For adding front end weight ahead of the front axle, as long as the front axle stays on the ground use the front axle as your pivot (balance)point.
Adding 1000 pounds of fluid in the front tires (centered at the front axle) would add 1000 pounds to the front axle and would not have any effect on the rear axle or drawbar.
Adding 1000 pounds ahead of the front axle would add 1000 pounds to the front axle plus transfer some weight off the rear. For example: if the extra 1000 pounds is centered 3 feet ahead of the front axle and the rear axle is 12 feet behind the front axle, you would transfer 1000lbs x (3feet/12feet) = 250 pounds from the rear axle to the front axle. The front axle carries 1250 pounds more and the rear axle carries 250 pounds less.
You probably don't want to leave the extra ballast on the front of the tractor when you carry a heavy fertilizer tank on the front of the tractor every spring. If you already have the suitcase weights, they would be handier than adding and removing fluid from the front tires every year.
If you don't have the suitcase weights, then buying them at $1 per pound would cost $1000. A rock box would be a low cost way to safely carry an extra 1000 pounds of inexpensive ballast, rocks, scrap iron, gravel, etc.
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