Another way to slow them down if the pump works well is to pipe the exit water up above the machine to make the pump lift the water. (I have not had any experience with the PM Research/Solar pumps) The exit water would need to spill into a funnel and return tube set at the desired height above the engine.
Similar result can be accomplished by placing a valve on the exit tube and closing it to the desired pressure (speed) is attained.
I have never tried this on an engine this small and I am pretty sure the pumps on the Microcosm Rider Ericssons will not lift water much at all.
Bruce, your brake works exceptionally well. Nicely done..!!
Gil
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