Hi Alfred and thanks for your suggestion and picture. I agree this could be a
more elegant solution than my 'arm stop' idea, but i would be interested to see
the reinforcements used in the area of the fuselage floor/tunnel your tubes
contact - another picture perhaps?. Essentially these tubes and their
load-bearing
structure could carry maybe 1-1.5 times the whole mass of the loaded a/c
(static mass + momentary inertial loading due to runway surface-induced 'bumps'
and some component of the vertical inertia due to vertical velocity of landing
the a/c) in a wheels-up landing, so with the resultant forces concentrated
onto the tube-end areas, the structure they touch will need to be quite capable.
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