Yet another solution for Joerg

This time a cheap (under $30) 12V 6W dynamo. No design time required.
Fit and forget.

May be a problem finding a way to mount it on a fully suspended MTB.

http://www.amazon.com/Bike-Bicycle-D...pr_product_top

And of course dirt cheap if you buy in bulk.

http://www.alibaba.com/trade/search?...=dynamo+12v+6w

--
JS

On 2015-02-26 8:45 PM, James wrote:
This time a cheap (under $30) 12V 6W dynamo. No design time required.
Fit and forget.

May be a problem finding a way to mount it on a fully suspended MTB.

http://www.amazon.com/Bike-Bicycle-D...pr_product_top


Thanks. That looks like a good dynamo that can deliver enough to power a
10W front light, provided there is a buffer battery and the light is not
always on full bore. On a typical ride mine is on high power only half
the time so this would work.

Only downside with bottle dynamos I found early on after moving to this
area is that they gunk up fast with mud in the winter. Summers are ok
but unfortunately mine also ate into the thin sidewall of the Gatorskin
tire.

What would be rear nice is a dynamo like this but as a tire surface
roller. Those were very popular in Europe in the 80's and were far
superior to bottle dynamos but seem to have vanished.

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

On Friday, February 27, 2015 at 2:03:23 PM UTC-5, Joerg wrote:
On 2015-02-26 8:45 PM, James wrote:
This time a cheap (under $30) 12V 6W dynamo. No design time required.
Fit and forget.

May be a problem finding a way to mount it on a fully suspended MTB.

http://www.amazon.com/Bike-Bicycle-D...pr_product_top


Thanks. That looks like a good dynamo that can deliver enough to power a
10W front light, provided there is a buffer battery and the light is not
always on full bore. On a typical ride mine is on high power only half
the time so this would work.

Only downside with bottle dynamos I found early on after moving to this
area is that they gunk up fast with mud in the winter. Summers are ok
but unfortunately mine also ate into the thin sidewall of the Gatorskin
tire.

What would be rear nice is a dynamo like this but as a tire surface
roller. Those were very popular in Europe in the 80's and were far
superior to bottle dynamos but seem to have vanished.

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

That's why rubber boots were made to fit over the serated steel roller = saved the tire sidewalls.

Cheers

On 2/27/2015 8:50 PM, Sir Ridesalot wrote:
On Friday, February 27, 2015 at 2:03:23 PM UTC-5, Joerg wrote:


What would be rear nice is a dynamo like this but as a tire surface
roller. Those were very popular in Europe in the 80's and were far
superior to bottle dynamos but seem to have vanished.

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

That's why rubber boots were made to fit over the serated steel roller = saved the tire sidewalls.

Alternately, some bottle dynamos are made with narrow rubber drive
roller that can ride on the braking surface of a rim.

Not that I imagine Joerg will do this, but: I modified an old Union
bottle dynamo to do that. I machined a groove into its drive roller and
fitted a thick O-ring. It's extremely smooth, seems to have less drag
(granted, that's not been measured) and has never slipped in the wet, so
far.

--
- Frank Krygowski

On 2015-02-27 9:52 PM, Frank Krygowski wrote:
On 2/27/2015 8:50 PM, Sir Ridesalot wrote:
On Friday, February 27, 2015 at 2:03:23 PM UTC-5, Joerg wrote:


What would be rear nice is a dynamo like this but as a tire surface
roller. Those were very popular in Europe in the 80's and were far
superior to bottle dynamos but seem to have vanished.

[...]

--
Regards, Joerg

http://www.analogconsultants.com/

That's why rubber boots were made to fit over the serated steel roller
= saved the tire sidewalls.

Alternately, some bottle dynamos are made with narrow rubber drive
roller that can ride on the braking surface of a rim.


I used to always have those but they wear out fast. When I visited
Germany last year I looked in a huge bike store but they didn't have
any. The city bikes over there mostly had hub dynamos and the more
sporty bikes had ... nothing.


Not that I imagine Joerg will do this, but: I modified an old Union
bottle dynamo to do that. I machined a groove into its drive roller and
fitted a thick O-ring. It's extremely smooth, seems to have less drag
(granted, that's not been measured) and has never slipped in the wet, so
far.


Now that is an excellent idea. How long does the O-ring last? Probably
one could slip a spare past the roller down onto the bottle shaft (after
making a shallow "holding groove" there).

--
Regards, Joerg

http://www.analogconsultants.com/

http://images.motorcycle-usa.com/Pho..._Outlaw_13.jpg

On Monday, March 2, 2015 at 12:01:40 AM UTC-5, wrote:
http://images.motorcycle-usa.com/Pho..._Outlaw_13.jpg

http://cdn.instructables.com/FW5/090...ZG7.MEDIUM.jpg

On Tuesday, March 3, 2015 at 8:38:35 AM UTC-5, wrote:
On Monday, March 2, 2015 at 12:01:40 AM UTC-5, wrote:
http://images.motorcycle-usa.com/Pho..._Outlaw_13.jpg

http://cdn.instructables.com/FW5/090...ZG7.MEDIUM.jpg

http://www.engadget.com/2015/03/02/n...2140122 43882

next year