Couple of shots of the Sq tube construction.

C. Smith

That is going to be interesting.


BTW Craig, Here is an improved design for the Zenair lower
rear motor mount bracket. We had a few problems with the
first design getting in the way of a stiffener on the 801
firewall which not all 801's had.

The dimensions as usual are in the dxf files after they
are unzipped and loaded into Q-Cad. The hole for the tube
that supports the lower bungy cord are matched drilled after
the brackets are installed.

Most of the load goes into this tube as well as does
most of the load on the front landing gear. What this
design does is relieve a lot of the engine inertia load that would
normally go into the firewall and transfers it directly to
the source of the load. Namely the front landing gear.
A subtle but important point. It is called load path
design.

Weld a washer around all the bolt holes.
The material is .0625 thick 4130 O.

The bend radius is 3T or greater.


Paul Lamar