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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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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I can change the upper mount, as you suggested but I am planning
on the main tension being taken up by another "V" strut fastened
above the top of the landing gear "A" frame as the Thorp does with
a regular aircraft engine.
Karibian


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OK send me a sketch. Or do you want me to do a new 3D?
Where and how is it going to be attached at the lower ends?