Boat v.s. Machine
The Dynamometer was built in the early 1900's at the Iowa State University in Ames, IA just to study horsepower.
Today, there are just a select few that are still in use at horse pulling contests.
The dynamometer pull is a resistance pull so when the team of horses are pushing in their collars, they are lifting the preset weights on the dynamometer. When this happens they are also releasing an oil valve to let oil flow through in a clockwise direction. This preset weight is the same weight and a constant weight throughout a given load. When the team stops and the weights are returned, this valve is closed.
The starting of the load, on the machine, can be very important, especially on a heavier load. You don't need a team to fight on the load and you don't have to hit each load hard. The better pulls are when a team works together in a uniform manner starting, pulling, and ending.
On the other hand, the boat or sled is a friction pull to where the runners or flat bottom it has on the ground, create friction with the ground it is running against. This weight could change at any time throughout a load determined by the ground it is sliding on. Just because they say the weight is 7,000 lbs. on the boat, will not mean that it is 7,000 lbs. for every team, that is pulling it. It could easily be 1,000 lbs. lighter or heavier for some other team depending where, on the track, it is sitting. Don't forget the friction is causing some weight conflict also.
Most spectators seem to understand the boat better, because it is dead weight they can visually see, but what they don't know is that the weight they are looking at isn't necessarily the same for all teams.
The weight they see a team pulling up on a dynamometer is the same throughout the load. The times this weight would be different, is if a horse tripped while pulling and lost the weight he was holding up, he would have to again lift it to recover from the fall. This can be a costly error on distance. The skids put under the front tires on heavier loads, would have some friction, but it doesn't interfere with the weights being lifted and pulled.
If you are a TRUE horse puller, it makes NO DIFFERENCE what you pull on or what the rules are... YOU LOVE TO PULL, YOU TRAVEL TO SUPPORT PULLS, YOU PULL AT VARIOUS CONTESTS AND REGARDLESS OF THE OUTCOME, YOU ARE TAKING A BIT OF HISTORY BACK HOME WITH YOU. Pullers, please know that we appreciate all of your hard work, dedication, and support in the Sport of Horsepulling!
Please note that horsepull.com does not agree or disagree with what anyone pulls on. Each teamster has a personal opinion of what contraption is best for them and their team.