Phil Williamson wrote:

  Paul,

    Take a peek at this web site and see what you think.

     http://www.land-and-sea.com/public/dyno/dynamometers.htm

    Later
    Phil

I am sure it works. The problem is adapting it to 
a PSRU prop shaft that has a large bending moment on it.
Boats and cars have no bending load on the drive shaft.

Much simpler to use Matt's idea of a simple pressure gage
on the instrument panel and a small hydrulic cylinder
built into the motor mount. See the drawing on the news letter
web site. Way cheaper too. If you like the data acquisition
feature replace the pressure gage with a pressure transducer
and feed that data into a computer along with engine RPM.
Everything else is simple arithmetic.
 
Paul Lamar
 
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