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

Paul/Perry,
Thanks for the info...I need to spend some time with AutoCAD now. Any more
info you have would be greatly appreciated.
Dean Head

When you get something drawn up send me an ACAD12 compatible drawing
and I will critique it.

Paul Lamar
 
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