Fred,
Ingenious with respect to structure and "hinging out of the way", but:
Do you see a risk in the harnesses cutting into each side of your neck when
under significant tension, since the two harness parts are restrained in the
center just behind the neck? The normal spread angle between the two parts
(supposedly comfortably snug on each side of the neck during normal flight)
will tend to narrow under tension, will it not?
Best regards,
Svein
LN-SKJ
----- Original Message -----
From: "Fred Klein" <fklein@orcasonline.com>
Sent: Monday, December 03, 2007 9:12 PM
Subject: Europa-List: Shoulder harness restraint
> 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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>
>
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