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:

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

 
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