Geoff M wrote:
Use a water pump, and a valve to adjust the flow. For a proper job, mount
the pump on bearings so it can rotate, restrained by a spring balance,
which is the basis for a Heenan and Froude water brake engine dyno.
Geoff

Thanks for the suggestion. I don't have a water pump, but I've been
offered a 2 hp hydraulic pump/motor unit free. I don't see a problem
with using this, do you?

Best wishes,

Chris