Graeme,
I thought we had left venturi's in the history books. My experience with
them goes back to Luscombes and Austers. They were always rather dudious
bits of kit that only work at all, at reasonably high speeds. That was when
they were fitted externally on the wing L/E or side of the fuselage. In
this position they create significant drag.
As you intend fitting it/them within the cooling duct be aware that on the
basis of 'not getting something for nothing' you will be interfering with
the engine cooling. Though I have not seen actual pictures of it you will
find that the flow lines within the air intakes under the engine will be
very turbulent which will not be appreciated by a venturi which relies on
smooth or even laminar flow to work well.
I personally think you would be much better off with a new fashioned Vac
pump or all electric/electronic instruments.
Just my input for further comment.
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From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of graeme bird
Sent: 09 April 2011 13:48
Subject: Europa-List: place for venturi -in air duct?
I am planing fitting a venturi to drive a vac AH & DI has anyone any
suggestions as to the best place to put the venturi. I am tempted to put one
or two smaller ones in the bottom of the air duct under the prop as I have a
few inches space under the radiators.
I am also tempted to ditch the heavy vac instruments and fit a trutrak AH/DI
--------
Graeme Bird
G-UMPY
Mono Classic/XS FWFD 912ULS/Warp drive FP
Build nearing completion
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=336442#336442
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