However to improve on the pip pin being used for this purpose I think would
need a pin threaded for a nut to be tightened and if you can develop a way
of access to a fully assembled aircraft for applying a bolt and nut I would
be pleased to hear of it ! In the meantime the pip ball rules!
Bob, and all others of course
I like you and no doubt quite a few others have given the threaded bolt
option
You mention quite some thought, spending a lot of time traveling for work
Gives you the luxury of time to ponder such small things, the main issue
I have over switching to some sort of threaded arrangement is the alignment
issues
With the pin now can be troublesome, now say it has the be PERFECTLY aligned
to
Get the thread to start without cross threading it, and it just got a whole
lot
Harder, of course you could use some form of stepped alignment with say a
3/8
Taper stepping up to the 1/2 inch thread and a caged nut that can move to
align
But not rotate, that was my idea anyway, but I don't think there is enough
space
Say 1/2 an inch, for the caged nut, plus then the tapered end of the bolt
sticking through
The nut. One option that did come to mind was something similar to a masonry
anchor
Where you slide the whole thing into a hole, and tighten the bolt(or nut)
depending
On the style and the unit in the hole expands at the end to lock itself into
the
Concrete. If you used an internal thread arrangement to pull a set of jaws
outwards
You could "grab" the back end of the socket where the balls are now, and
pull both spars
Then hard into the seat back, by simply tightening one bolt
HOWEVER
The device mentioned would likely be a custom made part, with springs etc to
ensure the jaws
Retract, I know of no such part at present.
Secondly, no doubt someone will weigh in with and it is a concern of mine
too
It is generally accepted the seat back is NOT contributing to transfer lift
loads etc
To the airframe, and that like most aircraft the wings do flex and move in
flight
If you have the spars firmly bolted to seat back then you remove that
movement potential
Completely and probably make the seat back a major load bearing component,
and who knows
What the result of that might be
Just my thoughts
Make of them what you will, the pin works ok, sure its not perfect, but
would
Something else be any better
Regards
craig
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