Recent Posts

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1
The Knowledge / Re: Cheap Dyno hub. A problem or just rubbish
« Last post by grams on Today at 01:51:22 pm »
The notchiness means the hub is constantly absorbing and releasing energy, for little net loss. But when you spin it the wheel will stop spinning the moment the kinetic energy is less than needed to overcome one notch.
2
The Pub / Re: Tune Association
« Last post by CAMRAMan on Today at 01:36:00 pm »
I Feel Love - Donna Summer
3
A Lilac Harry Quinn by Half Man Half Biscuit. As I hate the fact that god is always said to be male.

'...if god had meant for us to work, then I'm sure he she would have given us jobs...'

No much of a change, I'll grant you, but I like it!
4
Rides and Touring / Re: Mid-Essex Mid-Week Nocturnal Series
« Last post by Oscar's dad on Today at 01:34:52 pm »
I've got a route planned that takes in Boss Hoggs on the way home, so I can see what all the fuss is about!  ;D

You won't regret it.  Jem knows their menu off by heart  ;D
5
Rides and Touring / Re: Mid-Essex Mid-Week Nocturnal Series
« Last post by josser on Today at 01:33:57 pm »
I've got a route planned that takes in Boss Hoggs on the way home, so I can see what all the fuss is about!  ;D
6
The Pub / Re: What is this strange witchcraft?
« Last post by Mr Larrington on Today at 01:31:30 pm »
It's probably Halal too.
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The Pub / Re: The RANT thread (often contains fruity language)
« Last post by Mr Larrington on Today at 01:29:57 pm »
The ones used sometimes by Mr Sainsbury's House Of Toothy Comestibles are blurry and indistinct on a 32" 4k monitor powered by a fuck-off video card.  And the audio alternative nearly always doesn't work.
8
The Pub / Re: What have you fettled today?
« Last post by Mr Larrington on Today at 01:26:10 pm »
I glued some wheels to a fish.

Have you been near Nikki again?

I can see how you'd think that, but obviously as an elite track racer I don't hang around with mucky mountain bikers.   :D

Be advised that Fabien Canal, who claimed third place at Battle Mountain this year, is one o' they mucky mountain bikers ;D
9
Audax / Re: new club - Audax West Midlands
« Last post by hellymedic on Today at 01:16:47 pm »
'Nowhere to nowhere via South Mimms and Scotch Corner'...
10
The Knowledge / Re: Cheap Dyno hub. A problem or just rubbish
« Last post by Brucey on Today at 01:12:37 pm »
the other way of looking at it is the amount of KE the wheel has when you give it a spin.

Very roughly a rim weighs 500g and a rim + tyre weighs more like 1kg.

If you spin the wheel at about 10mph then that is ~5m/s

So without a tyre the KE is (mv^2)/2  = (0.5 x 5^2)/2 which is 7.5 joules

With a tyre the KE about double that.

So with the light on a tyreless wheel is likely to stop in about two seconds. Without the lights on it will be about three or four seconds if the drag is about 2W.  IME most shimano hubs (when fettled and the seals are run in) drag between 1 and 1.5W (in round numbers, lights off).

The Nexus ones which have a ~90mm diameter generator on the RH side of the hub are rather more draggy than that, lights off, but they are (amongst shimano ones) the exception.

cheers
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