Still more about hub dynamos

Henry Braun said:

*Starry-eyed post about wonderful wonderful new shiny hub dynamo*

You can fill in the details yourselves. Just took it out of town in the
rain and wet and looked for puddles to ride through. Cars were dipping
their headlights to it in salute, or just in amazement at being able to
see a cyclist in the hideous conditions.

Shiny, shiny, shiny.

They're nice, but they're very heavy and some bottle dynamos don't slip.
I might get one one day, but I'm happy with the bottle atm.

Zog The Undeniable said:

They're nice, but they're very heavy and some bottle dynamos don't slip.
I might get one one day, but I'm happy with the bottle atm.

My bottle on the 8 Freight doesn't slip (and I live on a muddy track).
It is lighter than the SONs in my Brompton and my tourer. And there is
no way I would /ever/ change the SONs for bottles. The hubs are just
/better/.

Riding along on the 'bent and it starts to get dark and the lights come
on automatically, there is no noise and no perceptible drag. If you try
one you will cease to be so happy with the bottle, which might be a good
reason not to!

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/

Zog The Undeniable said:

They're nice, but they're very heavy and some bottle dynamos don't slip.
I might get one one day, but I'm happy with the bottle atm.

The weight of a SON is not much different from the weight of a good
quality hub plus a good quality bottle dynamo of the allegedly
non-slipping variety plus a dynamo bracket, IMO.

Interested in the idea of non-slip bottle dynamos, though. I have
seen Lightspins and Busch & Muller bottles slip in the wet; which ones
don't?

Anyways, I'm sticking with the hubs, not least because they are less
vulnerable to mechanical damage. I am a careless bugger :-)

Guy
--
May contain traces of irony. Contents liable to settle after posting.
http://www.chapmancentral.co.uk

88% of helmet statistics are made up, 65% of them at Washington University

Henry Braun said:

*Starry-eyed post about wonderful wonderful new shiny hub dynamo*

You can fill in the details yourselves. Just took it out of town in the
rain and wet and looked for puddles to ride through. Cars were dipping
their headlights to it in salute, or just in amazement at being able to
see a cyclist in the hideous conditions.

Sadly, my Shimono dynahub has such excellent magnets that
the poles transiting past the armature actually generate
vibration I can feel through the handle bars and frame.

I know it's not bearings, because I only get the vibration
if the electrical lighting circuit is connected and on.

BugBear

Just zis Guy said:

The weight of a SON is not much different from the weight of a good
quality hub plus a good quality bottle dynamo of the allegedly
non-slipping variety plus a dynamo bracket, IMO.

Interested in the idea of non-slip bottle dynamos, though. I have
seen Lightspins and Busch & Muller bottles slip in the wet; which ones
don't?

Well, half a pound...that's quite a bit.

The weak point of a hub dynamo is that it rotates rather slowly. This
means bigger and/or more magnets to generate sufficient power.

B&M dynamos are non-slip - maybe except in snow - with the wire brush
roller.

Zog The Undeniable said:

B&M dynamos are non-slip - maybe except in snow - with the wire brush
roller.

Fine and dandy as long as you use tractor tyres :-)

Guy
--
May contain traces of irony. Contents liable to settle after posting.
http://www.chapmancentral.co.uk

88% of helmet statistics are made up, 65% of them at Washington University

Just zis Guy said:

Fine and dandy as long as you use tractor tyres :-)

Some people claim they are actually kinder to the tyre than the plastic
roller, but they must be correctly aligned at a tangent to the tread.
So far so good anyway.

Zog The Undeniable said:

The weak point of a hub dynamo is that it rotates rather slowly. This
means bigger and/or more magnets to generate sufficient power.

add all the magnets of a SON hub together, and you stiil won't have the
volume of the inefficient chunk found in a regular bottledynamo

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

In message <[email hidden]>, "Just zis Guy,
you know?" <[email hidden]> writes

Quoted message said:

Interested in the idea of non-slip bottle dynamos, though. I have
seen Lightspins and Busch & Muller bottles slip in the wet; which ones
don't?

I've not had any problems with my Axa HR dynamos, with the standard
rollers, on both my tourer and my 'utility' bike.

Quoted message said:

Anyways, I'm sticking with the hubs, not least because they are less
vulnerable to mechanical damage. I am a careless bugger :-)

I would love to stick a hub dyno on my utility bike but I'm also
attached to my drum brake on it for low maintenance and poor weather
performance. If I go back to commuting and using the tourer I may put
one on there though, otherwise, it doesn't really get used often enough
at night to be worth it otherwise.
--
Chris French, Leeds

"bugbear" <bugbear@trim_papermule_trim.co.uk> wrote in message
news:[email hidden]...

Quoted message said:

Henry Braun wrote:

Quoted message said:

Sadly, my Shimono dynahub has such excellent magnets that
the poles transiting past the armature actually generate
vibration I can feel through the handle bars and frame.

I've tried the Shimono and I think this is why the SON is the better
choice - if you can justify the price difference

John

John Horobin said:

Quoted message said:

Henry Braun wrote:

(actually, this wasn't me🙂

Quoted message said:

Quoted message said:

Sadly, my Shimono dynahub has such excellent magnets that
the poles transiting past the armature actually generate
vibration I can feel through the handle bars and frame.

I've tried the Shimono and I think this is why the SON is the better
choice - if you can justify the price difference

If my shiny, shiny Shimano hub (the Ultegra model) is producing vibration
then my Reynaulds disease has already got too bad for me to detect it. No
problems so far.

chris French <[email hidden]> wrote:
:>
: I would love to stick a hub dyno on my utility bike but I'm also
: attached to my drum brake on it for low maintenance and poor weather
: performance.

Shimano do a version of their hub with a drum brake as well ISTR

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
"Blogs are neither necessary nor sufficient for evil to triumph.
They're just what we call an enabling technology" - Danny O'Brien

In message <[email hidden]>, Arthur Clune
<[email hidden]> writes

Quoted message said:

chris French <[email hidden]> wrote:
:>
: I would love to stick a hub dyno on my utility bike but I'm also
: attached to my drum brake on it for low maintenance and poor weather
: performance.

Shimano do a version of their hub with a drum brake as well ISTR

Roller brake probably, and while they are ok, they aren't as good as my
Sachs drum brake.
--
Chris French, Leeds

chris French <[email hidden]> wrote:

: Roller brake probably, and while they are ok, they aren't as good as my
: Sachs drum brake.

While we're on the subject, anyone seen the new Sachs ibrake and ilight
system?

Arthur

--
Arthur Clune PGP/GPG Key: http://www.clune.org/pubkey.txt
"Blogs are neither necessary nor sufficient for evil to triumph.
They're just what we call an enabling technology" - Danny O'Brien

John Horobin said:

"bugbear" <bugbear@trim_papermule_trim.co.uk> wrote in message
news:[email hidden]...

Quoted message said:

Henry Braun wrote:

Quoted message said:

Sadly, my Shimono dynahub has such excellent magnets that
the poles transiting past the armature actually generate
vibration I can feel through the handle bars and frame.

I've tried the Shimono and I think this is why the SON is the better
choice - if you can justify the price difference

I have a SON 28 on my Galaxy and I can feel vibration
through the handlebars above about 18-20mph.

OTOH I have a SON 20 on my Birdy and I've not noticed
anything.

So I think it might be in part down to the build quality
of individual hubs - perhaps in the balance of the magnets?

Simon

m-gineering said:

add all the magnets of a SON hub together, and you stiil won't have the
volume of the inefficient chunk found in a regular bottledynamo

So where does the weight come from?

Zog The Undeniable said:

So where does the weight come from?

The high quality metal case with pretty serious sealing and bearings
that also integrate a good quality wheel hub? Don't forget to factor in
the weight of the hub to the comparitive weight of a bottle.

I run SONs and I run a bottle. There's just no contest for which is a
better overall solution to reliable and fuss free lighting, assuming you
have a spare hub that'll take one and have the readies to pay for it.

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/

On Fri, 29 Oct 2004 14:18:32 +0100, Peter Clinch
<[email hidden]> wrote in message
<[email hidden]>:

Quoted message said:

Quoted message said:

So where does the weight come from?

Quoted message said:

The high quality metal case with pretty serious sealing and bearings
that also integrate a good quality wheel hub? Don't forget to factor in
the weight of the hub to the comparitive weight of a bottle.

Exactly. Like I said: "The weight of a SON is not much different from
the weight of a good quality hub plus a good quality bottle dynamo of
the allegedly non-slipping variety plus a dynamo bracket, IMO."

I am just trying to fit a dynamo to SWMBO's bike, but I think I need a
Dynashoe.

Guy
--
May contain traces of irony. Contents liable to settle after posting.
http://www.chapmancentral.co.uk

88% of helmet statistics are made up, 65% of them at Washington University

"Just zis Guy, you know?" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I am just trying to fit a dynamo to SWMBO's bike, but I think I need a
Dynashoe.

Admit defeat and give her a SON! (I did)

cheers,
clive