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.

hi Karibian,  where the top tube meets the firewall i see no evidence of any
hardpoint reenforcement.  take a good look at what john thorp did for the
original mount points and you will see how much is needed.   i am trying to
figure out how to put a rotary eng. in a T18, right now myself useing the 3
hard points mr. thorp designed, and stumped.  my airplane is almost ready to
fly and i am removing a subaru eng because it is not properly mounted and i
consider it too dangerous to fly.  i bought it recently and did not know
much about the t18s , big mistake on my part.  if your tank is mounted and
the panel is  in you are in the same boat i am.  i think it will be easier
to just put a lyc in this one or sell it . good luck  wyo. walt.


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I thought those firewall upper hard points are reinforced.
Is that the fuel tank? Do you have any pictures showing the inside
of the firwall in that area Walt? Can you scan the plans in that
area?

Paul Lamar ...No rotor no motor.

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