Hi Carl,
With a fixed pitch prop, you can get a relative indication of power
level from the engine rpm. So on a Cessna 152, your standard procedure
might be to pull the power back to 1500 rpm abeam the numbers on down
wind. With a constant speed prop, the rpm will be held constant over a
wide range of power settings, so the standard measure of power is
manifold pressure (although we also use fuel flow often). So on our
Europa I would normally pull the power back to 15 inches abeam the
numbers.
Regards,
Terry Seaver
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Carl
Pattinson
Sent: Wednesday, September 03, 2008 2:01 PM
Subject: Europa-List: Manifold Pressure Gauge
--> <carl@flyers.freeserve.co.uk>
I am just filling in the LAA form to change our propeller (from a fixed
pitch to a CS version - Woodcomp/ Smart Avionics controller). The engine
is a Rotax 912 UL 80hp.
The LAA form says that the installation of a manifold pressure gauge is
mandatory. Anyone know why?
Its probably a dumb question but I dont understand the point of
monitoring manifold pressure on a normal engine. I always thought it was
more relevant to turbocharged engines.
Also where does one take the pressure takeoff on the engine - I would
guess the balancing pipe between the carburettors - is there a mod
required on the engine?
Thanks for the explanation in advance.
Carl Pattinson
G-LABS
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