TH-SR
Joined: 13 Jan 2006
Posts: 22
Location: WI
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 Posted: Sun Jul 16, 2006 6:45 am Post subject: 701 Seat Belt Attachment |
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Has anyone thought of seeking Chris's opinion on the attachment point issue, in light of Jon's current test results? Perhaps we can seek his advice at Oshkosh...
Todd Henning
West Bend, WI
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of John Bolding
Sent: Sunday, July 16, 2006 8:34 AM
To: zenith-list(at)matronics.com
Subject: Re: Back in the saddle Seat Belt Attachments.
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From: Gary Gower (ggower_99(at)yahoo.com)
Now, about John's comment. Probably the belts could need a little more attachment force.
But lets be honest that the human body can only take certain amount of "G" forces before (fataly and serious) damaging the brain and vital organs...
Gary is correct in stating that there is a limit to what body can take in a harness.
If memory serves, (50% chance of that) ultimate design strength of restraint system on certified aircraft is 40G.
I guess that's with the standard 170# dude so us fat asses can assume less. Or maybe I'm remembering the 40G's is the practical limit of survivalibility. Someone that KNOWS please help me here.
MY point is (and I didn't get it across very well the first time) is that I don't want a 20G system (pick whatever # here you feel is where Jon's system failed) and leave additional protection of my tender pink body on the table. We are saddled with the problem of having rather shallow fuselage depth and seats with a vertical compression component can't be used but that was not the MAIN issue here.
I have aircraft drawings from several well known designers of certified aircraft (in addition to Chris) that have also entered the homebuilt field at one time or another (C.G. Taylor, Dave Thurston, John Thorpe etc.) I'll dig thru them and see if they have a different application of attach fittings.
Some detailed pics of Jon's failure point might help a LOT here.
I have field tested the restraint system of an RV3 using a human (me) and walked away with only a butt that was sore for 6 months, sore neck and SERIOUS bruises from the belts. NOTHING BROKE, no kissing of the panel (it's pretty close on the "3" ), had the restraint system broken Van would have FIXED it!
Whoever said that it's more dangerous to drive to the airport than to fly an airplane was either kidding or doesn't know the facts and is just shooting to hear the gun go off.
LOW&SLOW John
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Todd
CH701 |
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