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  #61  
Old 07-30-2016, 10:15 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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I humbly suggest that if you get the point of relying on the thickness of your seat cushion for protection you are VSF (Very Severely ---well you can figure out the rest)!
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  #62  
Old 07-30-2016, 11:00 PM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
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Quote:
Originally Posted by RFSchaller View Post
I humbly suggest that if you get the point of relying on the thickness of your seat cushion for protection you are VSF (Very Severely ---well you can figure out the rest)!
I think we can all agree that same statement can be made in most situations where a 'chute pull has become necessary!

The thickness of seat cushion, it's density etc can play a role in absorbing vertical impact forces, however in cases where there isn't sufficient depth available to allow development of a purpose-engineered seat cushion solution, then the underlying structure needs to be design to absorb the vertical energy.

I don't know anything about how one goes about designing for "controlled crumple" of structure, but I have seen the end result of a well-designed energy absorbing seat. A particular helicopter was involved in a high energy crash where the main rotor RPM decayed badly, resulting in quite high vertical speed on impact. The pilot (the only person aboard) didn't walk away, but, because of the seat design, he also didn't suffer crippling spinal column injuries. The seat structure looked well and thoroughly "squished". To my untrained eye it looked as though the structures engineers hit their design goal pretty much right on the money.
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  #63  
Old 07-31-2016, 09:16 PM
RFSchaller RFSchaller is offline
 
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A few years ago I saw an article about designing airline seats. The cynical conclusion was that it was better to have the families of dead passengers than crippled survivors. Cost - Benefit analyses are a B+*ch!
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