Hi Thomas,

If I understand your question, I think the assumptions might be reversed. My understanding is that any dyno, whether water brake, prop-loaded (air brake), etc. that uses the scale/lever technique is actually measuring raw engine torque. If you want to measure the losses in the gearbox and/or prop, you would measure thrust, convert to HP & compare to HP calculated from torque/rpm.
If you are proposing measuring the output of a generator, you would be ignoring the losses in the inefficiency of the generator. That would be the equivalent of measuring only thrust in the previous example.

If I'm in error, hopefully someone more knowledgeable will jump in.

Charlie


Thomas Jakits wrote:

Ooh yes! Pleease!
thjakits@gmail.com <mailto:thjakits@gmail.com>

Thank you very much!

Question to a possible "DIY/cheapo"-dyno:
I saw various plans/models where one bolts up the engine/PSRU/club-prop and measures power via rpm x momentum (via bathroomscale/lever). This gives me the overall hp - incl any losses from the PSRU and inefficiencies fomr the prop.
What a about a pure engine-dyno? Drive a waterpump/generator (where do I get a cheap 300kw generator??) ???