Originally Posted by lohring
Have you considered loading the prop by submerging it in a closed can of water? I believe Jim Bamford used this method in a simple brake dyno.
It has been tried in a pond but needs forced air as well to get efficient combustion.
I have a powerful leaf blower but matching air speed and prop loading needs very fine tuning.
The slightest variation on many things related to hydroplanes at 130mph upsets all the settings i.e. weight, CG, prop depth in water when running at speed, angles of skeg, engine settings and type of load on engine.
Too much load and engine plus generator can overheat.
Light load and excess fuel and water cools it all.
Matching bench tests even with a dyno to actual competition speeds and conditions is not easy.
IC engines do not have as many problems compared to high speed flash steam power plants.