Paul Lamar said to Dave Leonard:
> What are the indications of compressor stall?
> I'll be glad to sponsor a dyno test of your engine
if you wish.
> What EGT's are you now seeing?

Dave Leonard replied:
> -Surge seems to be loss of boost at modest levels
of boost.
> > Not really interested in taking the engine off for
a dyno run.  Too
> much work.
> > Peak EGT's are around 900C. [1652 F]

What we need is a dyno that can mate to the prop
flange (with the engine
still mounted in the airplane).  :-)

Russell Kent

Here is a way of building in a dyno. Works like a
torque meter
on a PT6. Works best with a variable pitch prop.
Second one measures
the torque directly.

Paul Lamar

(de-lurking briefly...)

Take a look at the Lebow series of in-line torque
meters.  They've been used in the past for just this
application, mounted directly bewteen the output shaft
of the powerplant and the propeller.  Both slip ring
and telemetry types are available.

http://lebow.com/prodfolder/2110-16a2320a404.pdf

You might be able to rent this sort of equipment for
short-term use.  As you say, a variable pitch prop is
needed to properly control engine load.

Roger Enns.

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