How it works: The water brake dyno - The basic principles of the water brake dyno at Tractorpulling

A small footage of the basic principles of the water brake dyno used at standard tractorpull events. Since standard tractors are allowed to a certain amount of rpm's and hp's, every tractor has to be tested in front of a water dyno. This video shows how that occurs, with a small explanation of the working of a water dyno.
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