Dean Head wrote:

Paul,
I am finding the Barry mount discussion most helpful to visualize how it
comes together. Looking at your annotated Barry/Cup drawing I have a couple
of questions. I attached an edited copy marked up. Is the member that
receives the bolt a length of tube closed at one end with a 4130 disk?

Yes.

 If
so, the walls look quite thick. How thick?

At least 3/16" thick. If you plan to machine it on a lathe by
boring  bar stock it make it 1/4 inch thick.
Adds a tiny bit of weight but it is a high stress area.

Also, do you know the tubing
diameters and wall thickness used for the individual members in Perry's
mount?

What say you Perry?

Well, if I remember correctly the strut tubes are 5/8 od 0.12 wall.
I think the washers are 1/8 thick both sides of the firewall.
The big cup tubes I don't remember the exact od for certain but it
was large enough to get the socket wrench inside for the 1/2"
bolts.  It may have been 1.75 od, 0.12 wall.  I'll check when I go to
the airport. The flat plates welded on the mount on the sides and the
front is 3/16 thick.  There is also a 3/16 plate that bolts under
the right side of the engine (car/pusher) and bolts into the mount.
--
Perry Mick
Duckt N7XR
http://www.ductedfan.com
330 hours

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