Today's Message Index:
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1. 02:51 AM - Re: Safety and helmets (John Wighton)
2. 03:45 AM - Re: Safety and helmets (craigb)
3. 05:02 AM - Re: Safety and helmets (William Daniell)
4. 05:40 AM - Re: Safety and helmets (William Daniell)
5. 05:52 AM - Re: Earthquake Christchurch (William Daniell)
6. 05:57 PM - Re: Safety and helmets (Kenneth Fraser)
Message 1
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Subject: | Re: Safety and helmets |
Inflatable restraints are the air-bags of the aircraft world. We conducted a lot
of R&D in the 90's using car technology (FMVSS, NCAP etc test data) we then
set up some simulations using nifty finite element codes. The result from this
work (and the work of others) is a commercially available inflatable air-bag
system used in Cessnas and other products. Unlike most cars the air-bags are
fitted within the seat belts themselves (this makes periodic inspection/replacement
easier and also makes them potentially retro-fitable). The positioning
of accelerometers and sensors is still subject to optimisation within a particular
aircraft - that is why qualification has to be done on a type rating basis.
For the Europa pilot the correlation of the 4 point harness and helicopter seating
and restraint systems is more relevant. The approved systems for Cessna etc
are all 3 point (car-type) restraints. Four-point systems have inherent advantages
in terms of overall levels of safety (read that as occupant protection).
In a typical nose down, high rate vertical 'arrival' the major concern with Europas
(and all other VLA/LSA) is the high levels of intrusion into the occupant
space. Clarification - intrusion by airframe parts and/or powerplant/systems.
Air-bag restraints and similar systems would not necessarily help with reduction
in overall levels of occupant injury.
In summary, airbag restraints form an effective and desirable means of potentially
limiting occupant injury during typical GA type arrivals. Especially so if
integrated properly. However, of more relevance to Europa (read VLA/LSA) is
the requirement to have a high level of crashworthiness in the primary structure.
Typically this will require a optimally deformable seat base, 4 or 5 point
restraint system (to control occupant kinematics), roll-over protection.
Tomorrow's GA designs will have more focus on these key safety issues. They will
have adaptive ainflatable restraints (possibly mandated). This is especially
the case as electric powerplants and energy storage systems (batteries to you
and me) have high local inertias/mass and require effective restraint or controlled
kinematics during 'arrivals'.
Sorry to bore anyone with this - hopefully this answers the original question.
Happy landings.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331992#331992
Message 2
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Subject: | Safety and helmets |
If you are looking for a very thin lightweight helmet, perhaps a surfing
Helmet, they are about 10mm thick and very light
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of William Daniell
Sent: Thursday, 24 February 2011 6:10 AM
Subject: Europa-List: Safety and helmets
Probably opening a can of worms but anyway here goes.
I read in the most recent AOPA report it mentions the FAA study of 647
accidents of which 133 were fatal in Alaska between 2004 and 2009.
The FAA mentions 20 of the 133 could have been prevented by shoulder
harnesses - not particular surprise there.
38 of the 133 could have been prevent by inflatable restraints...this was a
new one for me. Anyone else know anything about this?
33 of the 133 could have been prevents by the wearing of helmets - slightly
surprised but at the same time it seems logical.
12 of the 133 could have been saved by ELT - again not particularly
surprising in Alaska.
I thought the inflatable restraints and the helmets point were quite
interesting. Does anyone wear a helmet and if so what type? Does anyone
know anything about inflatable restraints?
Will
Message 3
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Subject: | Safety and helmets |
Thanks to all. "Intrusion" I not the cockpit does not sound nice.
AS always I am educated...constantly amazed by the wealth of knowledge
available in the group.
When I started Skiing XX years ago (state secret) nobody wore helmets in
fact it would have been considered weird. Now most people, at least in
North America, even those who don't go fast or who used to go fast but don't
any more, wear them.
Will
Message 4
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Subject: | Safety and helmets |
Sorry that was gibberish
I meant to say - obviously - "intrusion into the cockpit does not sound
nice"
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of William Daniell
Sent: 24 February, 2011 07:56
Subject: RE: Europa-List: Safety and helmets
Thanks to all. "Intrusion" I not the cockpit does not sound nice.
AS always I am educated...constantly amazed by the wealth of knowledge
available in the group.
When I started Skiing XX years ago (state secret) nobody wore helmets in
fact it would have been considered weird. Now most people, at least in
North America, even those who don't go fast or who used to go fast but don't
any more, wear them.
Will
Message 5
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Subject: | Earthquake Christchurch |
Glad to hear all more or less well
Best wishes
Will
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Tim Ward
Sent: 23 February, 2011 21:11
Subject: Europa-List: Earthquake Christchurch
Dear All,
Many thanks for your kind enquiries about the earthquake in
Christchurch.
I was here and it was frightening. More of a lateral shaking then the
Sept 4th 2010. Three separate ones 6.3, 5.7 , 5.2 all scary stuff.
After fetching the children from school we got out of the city and drove
down to Geraldine as we didn=99t has water, electricity or sewage.
The inner city is a mess, a real mess. I lost a chimney only. The family
are all ok.
We now have electricity however the sewage system has been destroyed
with a lot of liquifaction, little volcano shaped
ground rock-silt coming to the surface. Big mess in the eastern part of
the city. Best thing is to stay out of the city so you don=99t use
the sewage system,water
and get a good nights sleep without after shocks!! My little girl has
been quite traumatised by it, well we all have
actually; the unexpected, the unnerving and how helpless one can be. The
earth is angry at the moment!!
And, of course, ZK-TIM slept right through it!!
Thanks again,
Tim
Tim Ward,
12 Waiwetu Street,
Fendalton,
Christchurch 8052
New Zealand
Ph; 03 3515166
Mob; 0210640221
email; ward.t@xtra.co.nz
Message 6
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Subject: | Re: Safety and helmets |
I routinely wear a Mk10 " bone dome" as issued by the RAF, etc. It is quite
wide so I had the bulged canopies fitted to allow for this. I tried a
Europa cockpit that had the standard canopy for size some years ago and it
was too tight a fit. (That was an Alpha helmet which is slightly smaller
than a Mk10.) I am 5 feet 10inches tall, not sure of sitting height.
I have no problem wearing it but greater reassurance re safety. A "high
top" version would probably not have a problem either.
I hope this opinion might help.
On a slight variation to this theme, I always wear a seat type parachute
(and bone dome) in the Chipmunk and Fox Moth but have not yet tried slim
back packs in the Europa (after removing the seat cushions). I wonder if
anyone wears a parachute in a Europa? Possibly for test flying.
Ken Fraser (G-IVET)
----- Original Message -----
From: "craigb" <craigb@onthenet.com.au>
Sent: Thursday, February 24, 2011 11:39 AM
Subject: RE: Europa-List: Safety and helmets
>
>
> If you are looking for a very thin lightweight helmet, perhaps a surfing
> Helmet, they are about 10mm thick and very light
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com] On Behalf Of William
> Daniell
> Sent: Thursday, 24 February 2011 6:10 AM
> To: europa-list@matronics.com
> Subject: Europa-List: Safety and helmets
>
>
> Probably opening a can of worms but anyway here goes.
>
> I read in the most recent AOPA report it mentions the FAA study of 647
> accidents of which 133 were fatal in Alaska between 2004 and 2009.
>
> The FAA mentions 20 of the 133 could have been prevented by shoulder
> harnesses - not particular surprise there.
>
> 38 of the 133 could have been prevent by inflatable restraints...this was
> a
> new one for me. Anyone else know anything about this?
>
> 33 of the 133 could have been prevents by the wearing of helmets -
> slightly
> surprised but at the same time it seems logical.
>
> 12 of the 133 could have been saved by ELT - again not particularly
> surprising in Alaska.
>
> I thought the inflatable restraints and the helmets point were quite
> interesting. Does anyone wear a helmet and if so what type? Does anyone
> know anything about inflatable restraints?
>
> Will
>
>
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