Since the angles of four of my 7/8 and 3/4 inch OD tubes attached to
the fire wall are near perpendicular it is impractical to use the
traditional methods of using a tube with a bolt in it. This is an

alternative

I am considering. Four 1/4 inch AN bolts or socket head cap screws
with a similar .063 thick 4130  plate on the back side of the ss/fiberglass
laminated plywood fire wall. A lot of little gussets to weld on.
Should distribute the load better into the relatively soft composite
firewall.

Vance what do you think?

Anybody?

 George Lendich wrote:

I've seen that done somewhere recently but can't remember where, probably in
a magazine
for new aeroplane design and automatically put it into the memory banks for
further possible
research, so I would be interested in a response from an engineering
perspective also.
George (down under)

Thanks George. My reasoning is to keep the 1/4 bolt holes as close
to the tube as possible. If hex head bolts are used don't try to use
a box wrench or socket on the bolt heads. Just end wrenches.
Allen head or internal wrenching bolts may be even better.

Paul Lamar

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