Dan, Nice Job! Awhile back I was talking to you about "H"-Point. The H-Point(as you may recall) is (in a profile view) where your hips rotate about or the center of your hip socket. If you draw a line starting from the H-Point, and normal (perpendicular)to your spine and then past, and then draw another line downward from the spine normal line at 45 degrees, this will give you a "zone" where to comfortably place the lap belt. In the automotive industry, this also happens to coincide with where the "biteline" is (which is the intersection of the back and cushion). Another method of locating this zone is to place the first line instead of normal to the spine, place it horizontally from H-Point and then the second line 45 degrees below the first line. You'll notice a shift in where the zone is. However, when considering that the KR seating arrangement is more like a "sports car" than a luxury car, I would Lay-out the belt zone like the first method of spine normal. As a point of reference only: The automobile industry uses a minimum of m11 bolts to secure seatbelts to the vehicle strucure. That's the equivalent of a 7/16th inch bolt. Typically, the seating system has to undergo a sled test, which places a full size crash dummy in the seating system and accellerates it 20 G's (equivalent of a 25 mph rear-end crash) The dummy must remain restrained in the seat and the seat-system has to prove it can withstand the test without a fracture failure of any seatframe component. If memory serves this is the FMVSS210 test. In real life, rear impact crashes often exceed the 20 G load, and often exceed 40 G's. I have seen time after time where the belts still remained attached (and therefore the occupant)to the structure, even under a 40 G impact load. ( Yeilded, yes, but still attached) The F/A-18 uses 7/16 bolts to attach the restraint system to the ejection seat. I'm not a strength Engineer, but the RV's use a 1/4 in bolt for this same purpose. What would I use? Probably 1/4 inch, bolted through the spar with large diameter washers to use as a back-up. Enjoy! --- Dan Heath <[email protected]> wrote: This is the only solution that I could > come up with that keeps the HARDware away from your > butt and the elevator > push tube travel.
> > > N64KR > > Daniel R. Heath - Columbia, SC > > [email protected] > > See you in Red Oak - 2003 > > See our KR at http://KR-Builder.org - Click on the > pic > See our EAA Chapter 242 at http://EAA242.org > _______________________________________________ > see KRnet list details at http://www.krnet.org/instructions.html ===== Scott Cable KR-2S # 735 Linden, MI [email protected] __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com
