Charlie England wrote:
> 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??) ???
>>