The position on the left is straight through ram air and on
the right is the filtered air source selected.

It will probably have to be bored on a large lathe after
the three 3 inch dia. tubes are welded to the barrel.
The Barrel is 4.3 inches ID so you need a thick wall chunk of

aluminum

tube 4.5 inches in dia. or about a 3.5 inch long 4.5 inch dia. bar

stock.

Nothing precision about it as you are dealing with huge volumes
of air so a little internal leakage here and there won't hurt much.

A lot fewer small parts than the dual butterfly valve.

Paul Lamar
A common waay of making an alternate air valve in the canard field

is:

C SMALE wrote:

make a trangular box with flat ends. hinge a flapper valve at the apex
of the triangle contrable via a cable from one end of the hinged

flapper.

air inlets are on each side of the triangle and the outlet is on the
base of the triangle. works very well. the drawing of the piece below

is

too diffult to make accurately.
smale@ncinternet.net

Much easier to make. Thanks. I used a square box as the arc of the
flapper
needs almost that much clearance.

Paul Lamar

I got my alternate air valve/filter assy/airbox and tubes from a salvage
yard Skymaster 337. Doesn't pay to make one! Lots of stuff like that
available elsewhere cheap....like the flymarket at Oskosh.....just adapt
it. They have all sorts of configurations, take a look.....
Marc Wiese

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