Phil Williamson wrote:

Paul wrote:

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

  I just came across it and thought you might like to check it out. IMO,
it's a bit spendy. I liked Matt's idea better as well. Could his idea be
applied to an auto as well? Could you mount one end to the engine and the
other to the frame or am I missing part of the thought behind it?

  Phil

Matt's dyno will work in a car. The advantage of the Land and Sea
scheme is it requires no calibration. On the other hand the 
motor mounts in cars are all different so calibration and a 
few other factors make Matt's idea impractical for cars.

Matt's hydrulic gauge dyno idea is perfect for the Questair type 
motor mounts in airplanes.

Paul Lamar
 
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