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I have built a glass
plenum for my lancair 235/320.
The problem is the
connection from the plenum nozzles to the cowl openings.
As you know
there will be engine movement on the rubber insulators. The
plenum that is secured to the cowl will need some relief where it connects
to the cowl inlets. I currently have it set up with the cowl openings
overlapping the outside of the plenum intakes with glass. It is a glass to glass
connection. Gary Edwards in Medford did his that way at it appears to be
working. I have the soft barry mounts and expect a little more engine shake
at start up and shut down than gary probably has. I want to avoid fatigue and
cracking on the front of my cowl, a cowl that I have spent significant time
working on. What I am looking for is what other have done for this connection. I
thought of using the orange silicone like rubber material to make some sort of
seal. The problem with that is keeping the thin rubber material snug against the
plenum and not sagging away from the plenum nozzles over time and leaving a gap
instead of a reasonable seal. I would be interested if someone is aware of
a material that could be bonded to the cowl overlapping the plenum intake
nozzles that is flexible and has reasonably good memory properties and that
would provide a snug connection to the cowl nozzles yet able to give when the
engine shakes. It could be a hard material that is bendable or something
that is stretchable like some kind of rubber or
neoprene.
Any suggestions
would be greatly appreciated.
Randy L.
Snarr
235/320 70% now with
an elec. MT 3 Blade propeller ...
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