[Jerry Clayton]

I think that a lot of the differances in concepts come because of the differances of a eddy current chassis dyno and a water brake engine stand dyno-----the eddy current will add a controlled rate of load depending on vehicle data loaded into the controller computer----it is based on rolling and aero load of the vehicle---a water brake dyno doesn't do that--you add load to hold the engine at the rpm instead of letting it accelerate along a curve representing the vehicles dynamics-------

and then there is the inertia dynos that compute numbers based on time to accerate a weighed load( as in a big steel drum full of concrete---------