Light works

James wrote:
On 30/08/14 02:06, Joerg wrote:
James wrote:
On 29/08/14 09:55, Joerg wrote:
James wrote:
On 29/08/14 08:27, Joerg wrote:


Europeans use hub dynamos a lot. It would be possible but
difficult on
my mountain bike because it has a serious disc brake up front. I'd
be ok
with a central Li-Ion battery if some company made a better holder
than
those flimsy Velcro thingies.

Maybe take a look here...
http://www.sp-dynamo.com/8Xseriesdynamo%20hub.html


When I win the lottery :-)

Is it really that much?


Yes, plus it weighs a pound or so and the unsuspended parts of a vehicle
should be as lighht as possible. Unless the weight is mission-critical
such as in brake discs where I wish they wouldn't put holes in them.

No. The hub I have weighs about 300g, IIRC, and a regular front hub is
over 150g already. The additional weight is no where near a pound or so.


I read 420 grams for the ones with disc brake mounts.



I think Schmidt and Sons in Germany makes something like this but then
you be looking at 100 Euros plus labor. I really don't like to do
spokes. Have done it but hated it.

Mine (SP PV-8) was about $150AUD delivered.

Ah, c'mon, front wheel spokes are easy.


On a MTB they must be super tight. That's where the lion's share of the
brake force during a gnarly downhill section goes into.

Back to wheel building school for you.


I am mostly riding MTB and that's where you have tons of force on the
spokes. In large parts due to disc brakes.



I'll raise your tonne of capacity for, well, infinite capacity while the
wheels keep turning ;-)


A dynamo sure would be nice but I'd still like to have a sizeable
battery. On an MTB you are often crawling up a very steep incline and
you really do not want your lights to extinguish 1/3rd of the way up. A
dynamo isn't going to produce at 2mph.


2mph? That's slower than walking pace. I'd get off and walk if I
couldn't pedal faster than that.


You can't walk 2mph on serious rocky inclines. Even if you could, you
still need light or there will eventually be a looong scream followed by
a thud.



This then.. http://www.starbike.com/en/son-edelux-2-led-front-lamp/


Seems to come without bracket. They need to offer with bracket. The
light is super expensive as it is (would be over US$200) and then I'd
expect not to have to build any missing stuff myself. Also, I hope that
black ring in back ain't plastic or it won't survive.


You didn't look very far. There's a metal bracket to attach it to your
bars. All nice and smooth so you don't cut for knee as you fly over the
bars, etc.


Got a link?

--
Regards, Joerg

http://www.analogconsultants.com/

James wrote:
On 30/08/14 02:20, Joerg wrote:
Lou Holtman wrote:


You have to realize that your commute route is far from usual.


Not in the Netherlands but in some parts of the world that is usual :-)

Even in your area it can be. I lived in your country for six years, in
Zuid Limburg. I rode over into Belgium a lot and over there we had lots
of remote and rugged mountainous paths that people used as shortcuts.
Many times I almost cussed my dynamo-driven lights because uphill they
produced so little light that I had to hop off the bike and walk it,
mostly to avoid doing an endo in a pothole that I didn't see.


Was that with a modern LED headlight?


No, bulbs. Regular and halogen. But with LED it's not much better unless
you have a battery because the super-caps only power most lights for 5
mins or so (when the dynamo is out of juice).

--
Regards, Joerg

http://www.analogconsultants.com/

On Thursday, August 28, 2014 12:58:45 PM UTC-4, Joerg wrote:
wrote:

http://www.autospeed.com/cms/A_112922/article.html





So when do bike accessory manufacturers finally wake up and build

something like this? Why do things take so long with bicycles?



Until now all the lights I've tried and seen are between "barely bright

enough" and utter junk.



--

Regards, Joerg



http://www.analogconsultants.com/

Reading the entire thread I see a post where you say you are an electrical engineer. Why don'y you just design something tthat you feel fits the needs of nightime trails MTB riders and test it then sell the design to a manufacturer?

Cheers

wrote:
AMAZING

each new visit to an old search question brings an AVALANCHE of material as here

https://www.google.com/#q=EFFECT+OF+...BICYCLE+WHEELS


I am not concerned about rotating mass but more about suspension
behavior. That becomes less than ideal if the non-suspended side gets
heavier. Goes for pretty much aany kind of vehicle.

--
Regards, Joerg

http://www.analogconsultants.com/

On Friday, August 29, 2014 11:30:42 PM UTC-7, James wrote:
On 30/08/14 00:34, jbeattie wrote:

On Thursday, August 28, 2014 11:42:20 PM UTC-7, Lou Holtman wrote:



I think a roadbike with 8 bar inflated 23 mm wide tires on Belgium



cobblestones take a lot more beating than a ATB with 2.5 inch

wide



nobby tires with front suspension.



Maybe, but most of us don't ride on Belgian cobbles -- and look at

what they do to road bikes. Paris Roubaix is littered with broken

parts.



I don't know if a hub dynamo is a good thing on a mountain bike and

defer to those who use them. Personally, I wouldn't bother with one

because of all the wiring and additional crap on my bike that would

get infrequent use, being that night trail riding is not something I

would do often. A battery light would be a more reasonable option,

and I could simply shift a light from my road bike for trail riding.

I also wonder whether a dynamo would put out enough light when I was

picking my way up forested single track at 4mph. It seems to add so

much complexity without a real pay-off. The calculus is different on

a commuter that gets a lot of night time use.



Um, complexity? If anything there is *less* complexity, because the

power source is integral with the bike - where as a battery must be

strapped on somewhere, and usually still has a cable from battery to light.

On Sat, 30 Aug 2014 10:04:18 -0700, Joerg
wrote:

Head lamps are outright hazardous where I ride. Gets you tangled into a
tree branch in a jiffy and then there's probably going to be a rescue
effort followed by an obituary.

Drivel: I get mildly irritated when some calls the front light a
"head" light, and the rear light a "tail" light. We inherited those
terms from the horse and buggy era. They apply nicely to horses,
donkeys, mules, and other beasts of burden, but not motor or human
powered vehicles. Unless you plan to have your bicycle pulled by one
of these, please use a more appropriate term.

It's also not a "lamp", which implies that something burning is
producing the light. Unless you use fire to illuminate your path,
please use the term "light" instead.

We return you now to whatever it was I interrupted.



--
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 Saturday, August 30, 2014 5:23:48 PM UTC-4, jbeattie wrote:
On Friday, August 29, 2014 11:30:42 PM UTC-7, James wrote:

On 30/08/14 00:34, jbeattie wrote:


Snipped

My brother does 24 hour mountain bike races and uses a battery light. A summer race around here involves maybe seven or eight hours of darkness, and most of the 24 hour races are run on a circuit, so you just bring a spare battery -- assuming your battery has a less than seven hour life. My light has a 10 hour run time on "low" (350 lumens).

Again, I think there is a pay off on commuter bikes and bikes that are routinely run in the dark for long periods of time or on an out and back with no way to change a battery (e.g. PBP).

-- Jay Beattie.

I do a lot of night riding in the winter. It's very easy to rig up two batteries with a switch so that when one is being used the other isn't. The battery in use starts to run low and the light level drops too low to be useful then flip the switch and that battery is disengaged and the fresh one's engaged. No loss of light switching batteries.

Cheers

On Sat, 30 Aug 2014 14:46:03 -0700, Jeff Liebermann
wrote:

Drivel: I get mildly irritated when some calls the front light a
"head" light, and the rear light a "tail" light. We inherited those
terms from the horse and buggy era. They apply nicely to horses,
donkeys, mules, and other beasts of burden, but not motor or human
powered vehicles. Unless you plan to have your bicycle pulled by one
of these, please use a more appropriate term.

Hmmm... Maybe there is something to using a real "tail" light.
https://www.kickstarter.com/projects/1653107857/tail-lights
http://tail-lights.com
http://www.cnet.com/news/tail-lights-provide-high-visibility-for-your-horse/

All you need to do is grow a pony tail or attach a fake pony tail to
your helmet, light it up, and you're highly visible and
indistinguishable from a horse.

--
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 Saturday, August 30, 2014 5:46:03 PM UTC-4, Jeff Liebermann wrote:
On Sat, 30 Aug 2014 10:04:18 -0700, Joerg

wrote:



Head lamps are outright hazardous where I ride. Gets you tangled into a

tree branch in a jiffy and then there's probably going to be a rescue

effort followed by an obituary.



Drivel: I get mildly irritated when some calls the front light a

"head" light, and the rear light a "tail" light. We inherited those

terms from the horse and buggy era. They apply nicely to horses,

donkeys, mules, and other beasts of burden, but not motor or human

powered vehicles. Unless you plan to have your bicycle pulled by one

of these, please use a more appropriate term.



It's also not a "lamp", which implies that something burning is

producing the light. Unless you use fire to illuminate your path,

please use the term "light" instead.



We return you now to whatever it was I interrupted.







--

Jeff Liebermann

150 Felker St #D http://www.LearnByDestroying.com

Santa Cruz CA 95060 http://802.11junk.com

Skype: JeffLiebermann AE6KS 831-336-2558




language and headlamps or otherwise....internet searching for sources brings different results for the array of common nomenclature and denotation. That is, the gem searched for may not show in the first ten pages when asked for front light.

Remember the language test ?

Ford factory manuals branch off into an odd term here and there...prob the one I want 2.

We should get the Japanese on this...what are the Asian manuals translating into ?



a concise terminology or what ?

On Friday, August 29, 2014 7:29:22 PM UTC-4, Frank Krygowski wrote:
On 8/29/2014 6:35 PM, wrote:

AMAZING



each new visit to an old search question brings an AVALANCHE of material as here



https://www.google.com/#q=EFFECT+OF+...BICYCLE+WHEELS



Gene, all of us already know about Google.



--

- Frank Krygowski

^^^^^^^^^^^^^^^^^^^^^^^


https://www.google.com/#q=mood+elevators+drugs&tbm=shop