Bicycle helmets with wings.

On 7/24/2014 7:48 AM, Duane wrote:
On 7/24/2014 8:26 AM, AMuzi wrote:
On 7/23/2014 7:46 PM, Jeff Liebermann wrote:
How to make a light weight helmet. As long as you're
moving, the
wings provide lift, which makes the helmet feel lighter.
(Ailerons,
flaps, and spoilers optional):
http://www.instructables.com/id/DIY-Hermes-Helmet/
http://cdn.instructables.com/FIW/0HNQ/HRTKK6CE/FIW0HNQHRTKK6CE.LARGE.jpg


http://www.cincinnati.com/picture-gallery/entertainment/arts/2014/07/16/cincinnati-opera-singer-shows-off-wings/12759505/


http://www.toyanxiety.com/images/view.aspx?productId=10833
https://www.flickr.com/photos/kfergos/4844514671/in/photostream/

https://www.flickr.com/photos/kfergos/4844514601/in/photostream/




http://www.yellowjersey.org/photosfr...t/ringhead.jpg


You should publish a book of photos.

Maybe one about my special computer service technique:
http://www.yellowjersey.org/photosfr...t/FIXCOMPU.JPG

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On 7/24/2014 9:06 AM, AMuzi wrote:
On 7/24/2014 7:48 AM, Duane wrote:
On 7/24/2014 8:26 AM, AMuzi wrote:
On 7/23/2014 7:46 PM, Jeff Liebermann wrote:
How to make a light weight helmet. As long as you're
moving, the
wings provide lift, which makes the helmet feel lighter.
(Ailerons,
flaps, and spoilers optional):
http://www.instructables.com/id/DIY-Hermes-Helmet/
http://cdn.instructables.com/FIW/0HNQ/HRTKK6CE/FIW0HNQHRTKK6CE.LARGE.jpg



http://www.cincinnati.com/picture-gallery/entertainment/arts/2014/07/16/cincinnati-opera-singer-shows-off-wings/12759505/



http://www.toyanxiety.com/images/view.aspx?productId=10833
https://www.flickr.com/photos/kfergos/4844514671/in/photostream/

https://www.flickr.com/photos/kfergos/4844514601/in/photostream/




http://www.yellowjersey.org/photosfr...t/ringhead.jpg


You should publish a book of photos.

Maybe one about my special computer service technique:
http://www.yellowjersey.org/photosfr...t/FIXCOMPU.JPG



Good thing I don't haven any lighter fluid at the office right now.
My favorite is the guy in the dress. lol

On Thu, 24 Jul 2014 18:35:45 +0700, John B. Slocomb
wrote:

They probably will work. But... I read of cyclists doing 100 KMH down
some of the hills in France. Try sticking your arm out of the car
window at 60 MPH and imagine if you had a wing attached.

I was probably 12 years old at the time. All I remember was the giant
dent I put in the neighbors car door. The impact must have been
substantial as my wheels had steel rims, which are quite difficult to
potato chip.

A good idea but you would need some sort of automatic closing device.
Perhaps similar to the air bags in a car where a blank shotgun shell
fires and the gas inflates the bag. To match the present helmets the
switch could be set for a force equal to a 14 MPH shock - about the
same as falling slightly under 1 meter and BAM your lid closes :-)

Ummm... not thanks. I think simply a few tension springs to make the
lid normally closed will suffice. The lift from the wings will open
the lid when moving, and close it when stopped. Presumably, when
there's an accident in progress, the airflow would be interrupted by a
sudden change in position, thus allowing the springs to close the gap.
A pressure locking system would also help.

But to carry that idea a bit further, why not an inflatable suit with
the gas generator. A slight shock and BAM you inflate and go bouncing
down the hill like a beach ball.

see http://tinyurl.com/odlfdd7 for several preliminary design
concepts.

Wearable air bags have their appeal, but tend to be expensive. For
example, the replacement air bag on a friend's vehicle cost $600 to
replace and that was a bargain. If bicycle air bags were similarly
priced, you could easily spend the purchase price of a new bicycle
every time the air bag deploys. No thanks. Also, wearable air bags
would probably fail the fashion and aesthetics test.

I should probably patent that idea. "Motion activated bifurcated
bicycle helmet mechanism for improved cranial cooling".

--
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 Thursday, July 24, 2014 1:26:59 PM UTC+1, AMuzi wrote:
On 7/23/2014 7:46 PM, Jeff Liebermann wrote:

How to make a light weight helmet. As long as you're moving, the

wings provide lift, which makes the helmet feel lighter. (Ailerons,

flaps, and spoilers optional):

http://www.instructables.com/id/DIY-Hermes-Helmet/

http://cdn.instructables.com/FIW/0HNQ/HRTKK6CE/FIW0HNQHRTKK6CE.LARGE.jpg

http://www.cincinnati.com/picture-gallery/entertainment/arts/2014/07/16/cincinnati-opera-singer-shows-off-wings/12759505/

http://www.toyanxiety.com/images/view.aspx?productId=10833

https://www.flickr.com/photos/kfergos/4844514671/in/photostream/

https://www.flickr.com/photos/kfergos/4844514601/in/photostream/







http://www.yellowjersey.org/photosfr...t/ringhead.jpg

You gotta carry your touring spares somewhere.

Andre Jute

On 24/07/14 21:35, John B. Slocomb wrote:
On Wed, 23 Jul 2014 23:54:07 -0700, Jeff Liebermann
wrote:

On Thu, 24 Jul 2014 11:37:12 +0700, John B. Slocomb
wrote:

There is a fundamental flaw in the Hermes Helmet. Above a certain
velocity the helmet will provide sufficient lift to counteract the
weight of the bicycle and rider and at that time all traction will be
lost possibly resulting in severe accidents as the airborne "rider" is
unable to corner.

You mean all these won't work?
https://www.google.com/search?q=bicycle+with+wings&tbm=isch
It seems such a common design idea that at least one of these might
fly. I vaguely recall adding wings when I was very young. I flew
about 10ft before turning the front wheel into a potato chip by
smashing into a parked car.

They probably will work. But... I read of cyclists doing 100 KMH down
some of the hills in France. Try sticking your arm out of the car
window at 60 MPH and imagine if you had a wing attached.

You're wrong. Lift is controlled by the angle of attack. Put your head
up and make the helmet lighter by increasing the angle of attack above
zero degrees (horizontal). Drop your head so the angle of attack is
less than zero degrees, and the wing actually pushes down on your head.
The force is transferred to your tyres, and you can corner faster and
brake harder - just like the wings on an F1 car!

--
JS

On 7/24/2014 6:15 PM, James wrote:
On 24/07/14 21:35, John B. Slocomb wrote:


You're wrong. Lift is controlled by the angle of attack. Put your head
up and make the helmet lighter by increasing the angle of attack above
zero degrees (horizontal). Drop your head so the angle of attack is
less than zero degrees, and the wing actually pushes down on your head.
The force is transferred to your tyres, and you can corner faster and
brake harder - just like the wings on an F1 car!

I know - servo-controlled wings, whose pitch angle is controlled via
feedback from a force sensor! Make it rider-tunable so the apparent
weight of the helmet fits the rider's individual preference.

Shimano can work on this after they've got us all using electronic
shifting. It will give their EEs something to do.

--
- Frank Krygowski

On 25/07/14 10:01, Frank Krygowski wrote:
On 7/24/2014 6:15 PM, James wrote:
On 24/07/14 21:35, John B. Slocomb wrote:


You're wrong. Lift is controlled by the angle of attack. Put your head
up and make the helmet lighter by increasing the angle of attack above
zero degrees (horizontal). Drop your head so the angle of attack is
less than zero degrees, and the wing actually pushes down on your head.
The force is transferred to your tyres, and you can corner faster and
brake harder - just like the wings on an F1 car!

I know - servo-controlled wings, whose pitch angle is controlled via
feedback from a force sensor! Make it rider-tunable so the apparent
weight of the helmet fits the rider's individual preference.

Shimano can work on this after they've got us all using electronic
shifting. It will give their EEs something to do.


Perhaps it's been done...

http://tinselblog.files.wordpress.co...bddvddc-2d.jpg

--
JS

On Fri, 25 Jul 2014 08:15:04 +1000, James
wrote:

On 24/07/14 21:35, John B. Slocomb wrote:
On Wed, 23 Jul 2014 23:54:07 -0700, Jeff Liebermann
wrote:

On Thu, 24 Jul 2014 11:37:12 +0700, John B. Slocomb
wrote:

There is a fundamental flaw in the Hermes Helmet. Above a certain
velocity the helmet will provide sufficient lift to counteract the
weight of the bicycle and rider and at that time all traction will be
lost possibly resulting in severe accidents as the airborne "rider" is
unable to corner.

You mean all these won't work?
https://www.google.com/search?q=bicycle+with+wings&tbm=isch
It seems such a common design idea that at least one of these might
fly. I vaguely recall adding wings when I was very young. I flew
about 10ft before turning the front wheel into a potato chip by
smashing into a parked car.

They probably will work. But... I read of cyclists doing 100 KMH down
some of the hills in France. Try sticking your arm out of the car
window at 60 MPH and imagine if you had a wing attached.

You're wrong. Lift is controlled by the angle of attack. Put your head
up and make the helmet lighter by increasing the angle of attack above
zero degrees (horizontal). Drop your head so the angle of attack is
less than zero degrees, and the wing actually pushes down on your head.
The force is transferred to your tyres, and you can corner faster and
brake harder - just like the wings on an F1 car!

To get technical about it, lift depends on the shape of the airfoil
AND the angle of attack. A well designed airfoil can generate lift at
zero angle of attack. In fact the common Clark "Y" airfoil has a
positive coefficient of lift at zero angle of attack and requires
about a negative 6 degree angle of attack to provide zero lift.
--
Cheers,

John B.

On Fri, 25 Jul 2014 08:15:04 +1000, James
wrote:

You're wrong. Lift is controlled by the angle of attack. Put your head
up and make the helmet lighter by increasing the angle of attack above
zero degrees (horizontal). Drop your head so the angle of attack is
less than zero degrees, and the wing actually pushes down on your head.
The force is transferred to your tyres, and you can corner faster and
brake harder - just like the wings on an F1 car!

Nascar is way ahead of us in the performance hat area.
http://media.photobucket.com/user/spoilercaps/media/spoiler-logo2.jpg.html
The spoiler probably is more useful at providing downward pressure to
keep the hat from flying away at speed, but could be inverted to
provide some lift.

However, at comfort bicycle speeds, I suspect a powered wing hat might
be more effective. There just isn't enough air speed available at the
speeds I like to ride. Looks like someone has anticipated the need
and done some work on the basic design:
http://www.dailyhaha.com/_pics/bird_head.jpg


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

AJ



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