<\/a><\/p>\n \nWe do not want to force anybody, to agree with our statements. \nThat is why we publish another opinion here:<\/h4>\n Betreff:\u00a0 Five point harnesses in gliders. \nVon:\u00a0 Peter Saundby<\/p>\n
Dear Mr. Weber<\/p>\n
While it is true that a properly adjusted four point harness can give \nprotection up to + 40G at 250G\/Sec for 0.2 Sec (Stapp 1961), it has \nbeen generally accepted that a five point harness is more effective and \nis less vulnerable to careless adjustment.<\/p>\n
I have read the attachment from DG and remain unconvinced.<\/p>\n
An important point is that although this paper correctly states that the \ncenter of gravity of the average human body is between the hips, a body \nunder load does not behave as a rigid entity with forces acting though \nthe C\/G. Humans are non rigid structures and the component parts will \nfollow their own paths within the limits of flexibility and strength, \nrather like the links of a chain. In a crash deceleration, the upper \ntorso will swing forward on the fixed hips and impose loads on the \nshoulder harness which in turn can distort the lap strap. I repeat that \nthe prime function of the fifth crutch strap is to stabilize the lap \nstrap and not to provide direct restraint. The high loads measured in \nthis strap arise from opposing the forces exerted by the mass of the \nupper torso on the shoulder harness.<\/p>\n
All this is not simply my personal opinion, I copy an extract from the \ncurrent leading textbook [Aviation Medicine, 2nd Edition 1994, Ernsting \n& King, ISBN 0 7506 2275 X; page 171]<\/p>\n
“Double lap and shoulder harness with a negative G strap (‘Five-point harness’) \nThe simple four point harness is much improved by the addition of a \nnegative G strap (figure 12.4(b)). This strap, also known as ‘lap belt, \ntie down strap’ or ‘harness stabilizing strap’ rises from the seat in \nthe mid line between the legs to join the harness at a central quick \nrelease point. It prevents distortion of the harness by forces imposed \non the torso and is extremely effective during aerobatics and aircraft \nmaneuvers that involve negative G, during vertical vibration in high \nspeed low level flight and under crash impact.”<\/p>\n
See also the following references: \nAircraft Crash Survival Design Guide (1980) US Army Research and \nTechnical Laboratories\u00a0 USARTL-TR-79-22 \nHaley JL, (1982) Impact injury caused by Linear Acceleration: \nMechanisms, prevention and cost. AGARD\/NATO Conference Report CP-322.1-5. \nVon Guirke HE, & Brinkley JW, (1978) Impact Accelerations. In \nFoundations of Space Biology and Medicine. Vol 11 Book 1 Chap 6. NASA.<\/p>\n
Wilhelm Dirks has stated that “a 5-point harness is very dangerous”. \nBecause this is contrary to current text book statements and accepted \nopinion in other countries, his evidence should be published as a \nscientific paper in a refereed journal. If Martin Sperber has evidence \nfrom accident investigation that contradicts accepted wisdom, that also \nshould be published as a scientific paper. Then the whole question would \nbe considered in a balanced manner, and at a later date, amendments \ncould be incorporated into JAR 22.<\/p>\n
What is unacceptable is an emotional argument, not based on any \npublished evidence, intended to frighten pilots about vulnerable \ncomponents of their anatomy.<\/p>\n
Any of this may be copied or repeated at your discretion.<\/p>\n
Regards, Peter.<\/p>\n
\nPlease allow another comment from us:<\/h3>\n Our knowledge mainly came from Martin Sperber and his investigations. \nHe says that at any case you must not compare the circumstances in Military Aircraft as well as in Acrobatic Aircraft with ours in sailplanes. The sitting position is completely other because we are not sitting on a “kitchen chair” but like in a “deck chair”. So the forces are quite different and our abdomen is very near to the 5th strap. \nNevertheless it is worth to consider again. \nAnd what is to do for the manufacturer? \nI personally would let decide our customers and would offer the 5-point-harnesses as an option.<\/p>\n
But the last decision is for the Chief Designer!<\/h4>\n \nA further comment to the seat belt material<\/h2>\n Glaser-Dirks at one time used seat belts made of very smooth material which had a tendency to loosen up during flight. The belts we use today, made by Schroth do not have this problem. Belts are good for a limited number of years in any case.<\/p>\n
If you still have the old, smooth belts you should think about exchanging them.<\/h4>\n","protected":false},"excerpt":{"rendered":" This may sound like a dumb question but it’s meant seriously! The cockpit of a glider obviously does not offer much protection in case of an accident.\u00a0 Almost every auto has a bigger and stronger “crush zone” that can absorb some of the impact energy.\u00a0 luckily, this is partially compensated for by our use of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":13414,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_trash_the_other_posts":false,"editor_notices":[],"footnotes":""},"class_list":["post-13611","page","type-page","status-publish","hentry"],"rankMath":{"parentDomain":"dg-aviation.de","noFollowDomains":[],"noFollowExcludeDomains":[],"noFollowExternalLinks":false,"featuredImageNotice":"The featured image should be at least 200 by 200 pixels to be picked up by Facebook and other social media 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