Hi guys,
Just wanted to share a solution to the issue of raising the shoulder
harness restraint sufficiently to minimize the potential for spinal
compression during a rapid deceleration event.
This approach allows for one to sit upon the existing head rest while
entering and exiting the aircraft, does not encroach upon the access to
the baggage area, confines all forces to the CM rather than
transferring them to the fuselage shell, and can easily be added to a
completed and upholstered cockpit.
Although the riser weighs but 10 oz., it is robust enough to withstand
the compression load generated by a 1500# tension load on the straps
measured at an angle of 90 degrees to the slope of the back of the
headrest; testing was done using a 20 ton hydraulic press. Assuming an
upper body wgt. of 100#, it would be good for 15 Gs.
Comments appreciated!
Fred
A194
PS: If anyone wants to duplicate this as a nice little winter project,
I could be persuaded to put together some kits of the hot-wired foam,
hinges, acft. plywood, and instructions...contact me off-list.
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