This is the start of my Thorp T18 engine mount tacked together. When it
comes back from the welder I will tack together the bottom cross pieces.
Am I leaving anything out?? Karibian

I assume those verticals are just temporary as welded them
in would hurt and not help. I cannot see the lower hard points
connections so I cannot comment on those.

The upper connections are inadequate. You need a more traditional
cup type connection where the bolt is in a blind tube. See the 2D
sketch attached. The angle will crack sooner or later. You also will
need an X in the bottom of course. See the attached 3D.

If you have the schertz beam I would bolt it on before
the welder did any final welding. If not make a temporary
schertz beam simulator so the mount does not warp out
of alignment with the schertz beam.

Paul Lamar ...No rotor no motor.

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