Semi-OT People believe helmets are designed to break on impact thus giving protection!

On Mon, 10 Feb 2014 16:59:24 -0800 (PST), Sir Ridesalot
wrote:


Seems to me that a lot of people are sadly very misinformed as to how a helmet is supposed to work in prtecting the head.

Perhaps someone should build a helmet that uses the reactive armor
principle:
http://en.wikipedia.org/wiki/Reactive_armour
If you hit the ground with your helmet, a small explosion will nullify
the penetrating forces, thus keeping the helmet and hopefully your
head intact. Since the impact force is relatively small, very little
explosive is needed. Hearing protection is recommended.

When all else fails:
http://sheldonbrown.com/airbag-helmet.html

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Tuesday, February 18, 2014 7:29:33 PM UTC, Jeff Liebermann wrote:

If you hit the ground with your helmet, a small explosion will nullify

the penetrating forces, thus keeping the helmet and hopefully your

head intact.

Milspec D30, a plastic that hardens momentarily on impact. I have a leather iPhone case with a layer of D30, and it works fine.

Andre Jute
Da Smasha

On Tue, 18 Feb 2014 11:29:33 -0800, Jeff Liebermann
wrote:

On Mon, 10 Feb 2014 16:59:24 -0800 (PST), Sir Ridesalot
wrote:


Seems to me that a lot of people are sadly very misinformed as to how a helmet is supposed to work in prtecting the head.

Perhaps someone should build a helmet that uses the reactive armor
principle:
http://en.wikipedia.org/wiki/Reactive_armour
If you hit the ground with your helmet, a small explosion will nullify
the penetrating forces, thus keeping the helmet and hopefully your
head intact. Since the impact force is relatively small, very little
explosive is needed. Hearing protection is recommended.

When all else fails:
http://sheldonbrown.com/airbag-helmet.html

Gee, that's a great idea.

But doing some more "outside the box" thinking I wonder why, utilizing
a proximity fuse system, one could not build a device that when it
senses the ground, or other immovable object rapidly approaching would
trigger a counter-reactive force and then perhaps we could forget the
dangers of crashes and sudden encounters with SUV's.

Just think of it, "Bullet Proof Bicycles" :-)
--
Cheers,

John B.

On Tue, 18 Feb 2014 12:02:43 -0800 (PST), Andre Jute
wrote:

On Tuesday, February 18, 2014 7:29:33 PM UTC, Jeff Liebermann wrote:

If you hit the ground with your helmet, a small explosion will nullify

the penetrating forces, thus keeping the helmet and hopefully your

head intact.

Milspec D30, a plastic that hardens momentarily on impact.
I have a leather iPhone case with a layer of D30, and it
works fine.

Andre Jute
Da Smasha

http://www.d3o.com/materials/
Looks like they already have a helmet liner:
http://www.d3o.com/d3o_products/helmet-liner-range/
http://www.d3o.com/d3o_products/trust-helmet-liner-system/
I still think using explosives in safety devices would be more umm...
interesting. Your head is saved, but everyone around you gets a dose
of plastic shrapnel.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Wed, 19 Feb 2014 08:16:29 +0700, John B.
wrote:

On Tue, 18 Feb 2014 11:29:33 -0800, Jeff Liebermann
wrote:

On Mon, 10 Feb 2014 16:59:24 -0800 (PST), Sir Ridesalot
wrote:


Seems to me that a lot of people are sadly very misinformed as to how a helmet is supposed to work in prtecting the head.

Perhaps someone should build a helmet that uses the reactive armor
principle:
http://en.wikipedia.org/wiki/Reactive_armour
If you hit the ground with your helmet, a small explosion will nullify
the penetrating forces, thus keeping the helmet and hopefully your
head intact. Since the impact force is relatively small, very little
explosive is needed. Hearing protection is recommended.

When all else fails:
http://sheldonbrown.com/airbag-helmet.html

Gee, that's a great idea.

Something is wrong. Nobody every likes any of my ideas.

But doing some more "outside the box" thinking I wonder why, utilizing
a proximity fuse system, one could not build a device that when it
senses the ground, or other immovable object rapidly approaching would
trigger a counter-reactive force and then perhaps we could forget the
dangers of crashes and sudden encounters with SUV's.

Just think of it, "Bullet Proof Bicycles" :-)

I did something like that in the 1960's. The inspiration was when a
friend dozed off while driving to Las Vegas and trashed *MY* car with
me asleep in the passenger seat. What I needed was a way to alert the
driver that they were about to fall asleep. I determined that the
muscles keeping the head upright are the first to go slack, causing
the head to fall forward. I supplied a headband with two pre-RoHS
mercury switches that originally fired off a Sonalert noise maker.
That was ok, but there was a problem. The driver would awake with the
head and most of the upper body pitched forward and not in any
position considered useful for driving a vehicle. I needed a way to
force the upper body and head erect. So, I attached a air bag under
the chin, and a motor to quickly tighten the shoulder belt. Unlike
later air bags, I didn't need millisecond inflation time, so mine was
just a compressed air bottle and a small motor. It worked amazingly
well. When the driver was lurched back into consciousness, they were
in the correct position to drive the vehicle. I didn't go beyond this
single shot prototype for some long forgotten reason.

With a little modernization, the same method could be applied to
bicycle protection. MEMS sensors could determine that the rider had
assumed an awkward position, probably due to an accident in progress.
The compressed air bottle could inflate an air jacket, inflatable neck
band, double layer helmet, or whatever. This has already been done
with motorcycle jackets, vests, and one bicycle helmet and neck
airbag:
http://www.hovding.com/en/
http://www.impactjackets.com
Once these airbag designs have become mainstream and accepted, I think
the next step is the reactive armor or counter force protection.

One could probably make a crude version of reactive armor using
rapidly expanding urethane foam. The principle is the same whether
one uses explosives or reactive chemicals. Normally, the two
chemicals that produce the urethane foam are separated in different
layers of the helmet. On impact they mix, and instantly produce
enough foam to provide a suitable counter force. The harder the
impact, the more aggitation, and therefore the more foam is produced.
The only problem is that the reaction is exothermic and may burn the
riders head. Details.

After the expanding foam helmet, the next step is a bicycle ejection
seat that launches the cyclist clear of an accident in progress and
gently lands them on the ground with a jet pack or parachute. Stay
tuned to this newsgroup for the further adventures of "You're Safe,
Even If It Kills You".



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann wrote:

snip
Stay tuned to this newsgroup for the further adventures of
"You're Safe, Even If It Kills You".

Sounds like a great series, but wouldn't YouTube be a more appropriate
place to publish?

On Tue, 18 Feb 2014 20:37:28 -0800, Jeff Liebermann
wrote:

On Tue, 18 Feb 2014 12:02:43 -0800 (PST), Andre Jute
wrote:

On Tuesday, February 18, 2014 7:29:33 PM UTC, Jeff Liebermann wrote:

If you hit the ground with your helmet, a small explosion will nullify

the penetrating forces, thus keeping the helmet and hopefully your

head intact.

Milspec D30, a plastic that hardens momentarily on impact.
I have a leather iPhone case with a layer of D30, and it
works fine.

Andre Jute
Da Smasha

http://www.d3o.com/materials/
Looks like they already have a helmet liner:
http://www.d3o.com/d3o_products/helmet-liner-range/
http://www.d3o.com/d3o_products/trust-helmet-liner-system/
I still think using explosives in safety devices would be more umm...
interesting. Your head is saved, but everyone around you gets a dose
of plastic shrapnel.

Sort of like the "air bags" that I believe western cars have built
into them? It ain't really "air" in those bags unless "air" can be
generated by an explosive charge :-)

--
Cheers,

John B.

On Tue, 18 Feb 2014 21:07:13 -0800, Jeff Liebermann
wrote:

On Wed, 19 Feb 2014 08:16:29 +0700, John B.
wrote:

On Tue, 18 Feb 2014 11:29:33 -0800, Jeff Liebermann
wrote:

On Mon, 10 Feb 2014 16:59:24 -0800 (PST), Sir Ridesalot
wrote:


Seems to me that a lot of people are sadly very misinformed as to how a helmet is supposed to work in prtecting the head.

Perhaps someone should build a helmet that uses the reactive armor
principle:
http://en.wikipedia.org/wiki/Reactive_armour
If you hit the ground with your helmet, a small explosion will nullify
the penetrating forces, thus keeping the helmet and hopefully your
head intact. Since the impact force is relatively small, very little
explosive is needed. Hearing protection is recommended.

When all else fails:
http://sheldonbrown.com/airbag-helmet.html

Gee, that's a great idea.

Something is wrong. Nobody every likes any of my ideas.

But doing some more "outside the box" thinking I wonder why, utilizing
a proximity fuse system, one could not build a device that when it
senses the ground, or other immovable object rapidly approaching would
trigger a counter-reactive force and then perhaps we could forget the
dangers of crashes and sudden encounters with SUV's.

Just think of it, "Bullet Proof Bicycles" :-)

I did something like that in the 1960's. The inspiration was when a
friend dozed off while driving to Las Vegas and trashed *MY* car with
me asleep in the passenger seat. What I needed was a way to alert the
driver that they were about to fall asleep. I determined that the
muscles keeping the head upright are the first to go slack, causing
the head to fall forward. I supplied a headband with two pre-RoHS
mercury switches that originally fired off a Sonalert noise maker.
That was ok, but there was a problem. The driver would awake with the
head and most of the upper body pitched forward and not in any
position considered useful for driving a vehicle. I needed a way to
force the upper body and head erect. So, I attached a air bag under
the chin, and a motor to quickly tighten the shoulder belt. Unlike
later air bags, I didn't need millisecond inflation time, so mine was
just a compressed air bottle and a small motor. It worked amazingly
well. When the driver was lurched back into consciousness, they were
in the correct position to drive the vehicle. I didn't go beyond this
single shot prototype for some long forgotten reason.

With a little modernization, the same method could be applied to
bicycle protection. MEMS sensors could determine that the rider had
assumed an awkward position, probably due to an accident in progress.
The compressed air bottle could inflate an air jacket, inflatable neck
band, double layer helmet, or whatever. This has already been done
with motorcycle jackets, vests, and one bicycle helmet and neck
airbag:
http://www.hovding.com/en/
http://www.impactjackets.com
Once these airbag designs have become mainstream and accepted, I think
the next step is the reactive armor or counter force protection.

One could probably make a crude version of reactive armor using
rapidly expanding urethane foam. The principle is the same whether
one uses explosives or reactive chemicals. Normally, the two
chemicals that produce the urethane foam are separated in different
layers of the helmet. On impact they mix, and instantly produce
enough foam to provide a suitable counter force. The harder the
impact, the more aggitation, and therefore the more foam is produced.
The only problem is that the reaction is exothermic and may burn the
riders head. Details.

After the expanding foam helmet, the next step is a bicycle ejection
seat that launches the cyclist clear of an accident in progress and
gently lands them on the ground with a jet pack or parachute. Stay
tuned to this newsgroup for the further adventures of "You're Safe,
Even If It Kills You".

Zero altitude ejection seats are old hat in the Air force so the
technology is there.

But... Being from a Western country I'm sure that you will have to
incorporate many safety devices in order to market your innovation.
Safety levers and knobs and switches to prevent inadvertent actuation
of the life saving devices.

The Air Force simply has one or two large handles painted with yellow
and black stripes. Pull those handles up and squeeze the deployed
triggers and Bang, you're a bird.

But I'm sure that y'all will need to include bullet proof safety
devices... perhaps an initial key lock to prevent unintentional
actuation.... followed by a bright orange sticky tape that needs to be
removed and perhaps the ultimate safety - the "break here" glass
capsule.

But I've ignored the safety notices that will, of course, need to be
in the language of the user... maybe multi-lingual if there is any
chance of misunderstanding.

--
Cheers,

John B.

recent news reported poll showing 25% USA may believe sun revolves around Ert.

Now a word from Saskatchyuwan...

and off course

http://uk.eurosport.yahoo.com/news/f...50322--f1.html

On Wed, 19 Feb 2014 18:35:31 +0700, John B.
wrote:

Sort of like the "air bags" that I believe western cars have built
into them? It ain't really "air" in those bags unless "air" can be
generated by an explosive charge :-)

The term "gas bag" would probably have been politically incorrect and
could have had a detrimental effect on consumer acceptance. In
western countries, it is perfectly acceptable to lie, distort,
exaggerate, mislead, and otherwise mutilate technical descriptions, so
as not to confuse the consumer with technically accurate facts. This
is why it's called a "seat belt", which neither protects ones seat nor
operates like a common trouser belt, and not an "impact safety
harness", which would be more technically accurate. Careful what you
wish for as you may find yourself riding around on a "human powered
single track rotary motion transportation device" instead of a
"bicycle".

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558