|
Posts: 508 |
Sorry, but you obviously never took a statics class. 
The drawbar is fixed in relation to the tractor frame & thus how it's mounted, or what angle it runs at makes absolutely no difference to the performance of the tractor. It will change the load (force) in the mounting hardware, but the effect on the tractor will net out the same. To reuse your teeter totter example, the pivot point is the rear axle & you are the chain hook standing on the hitch. The balancing load (person on the other end of the teeter totter) is the center of mass (CG) of the tractor and the front wheels (other end of the teeter totter) are on the ground as long as the tractor weight x moment arm (distance forward from center of axle to CG) is greater than the chain load x it's moment arm from the rear axle. As the tractor heads down the track the chain load increases until it balances the tractor CG at which point the front wheels are still on the ground, but not carrying any weight. As the chain load increases more, the front wheels come off the ground, but at the same time the hitch lowers which shortens the moment arm for the chain load (you move forward on the teeter totter) until balance is restored. I also hear a bunch of stuff about running your hitch angle uphill, downhill, or maybe even sideways  The only way that makes any difference is if whoever measures your hitch allows extra height by how they measure. For example, if your hitch runs down toward the sled & they only measure at the rear lip of your hitch, you really have a little extra height becasue the hook hangs over the edge of the hole & the rear lip. Or if they measure the rear point of the hole & your hitch runs uphill, you again have a little extra height when the hook hangs on it. If they measure the highest point from the middle of the hole back (as they should) you want to be as close to level as possible.
|
