Guys,

After fooling around with those gadgets for quite a while I found that
the Calculator of Pe Reivers is giving me the same or very near
results by just using ONLY the RPM meter. Try this:

> http://www.mvvs.nl/
>
> Click 'Propellers' on the left and then click the
> 'Propeller power calculation sheet' link. You can use
> it on-line, or download it.

and no more mess with fuels and waste of time.

Cheers,
Nick