Guinea Pig Needed

[RossG]

That reminds me of those drum dynamo's, you bolted it on the bottom bracket and flicked a lever when you wanted to power up your lights. They tended not to slow you down as much as a bottle dynamo but again slippage was a problem in the wet, wonder if they still make them ?

 

[Swizz]

That reminds me of those drum dynamo's, you bolted it on the bottom bracket and flicked a lever when you wanted to power up your lights. They tended not to slow you down as much as a bottle dynamo but again slippage was a problem in the wet, wonder if they still make them ?

Don't think I have ever seen one tbh. Used to have a bottle dynamo in not the best condition and that was quite the opposite of an electric motor ;D

 

[RossG]

They talk about them on this page, there's a piccy of one the same as I once had.

Does anyone still make a bottom bracket dynamo? - Bike Forums

Classic & Vintage - Does anyone still make a bottom bracket dynamo? - Im trying to help a friend power some lights on the cheap. Light theft is a big problem here, so I want to avoild a battery powered removable light. It seems like a bottom bracket dynamo might be the best route since building...

www.bikeforums.net

 

[Swizz]

They talk about them on this page, there's a piccy of one the same as I once had.

Does anyone still make a bottom bracket dynamo? - Bike Forums

Classic & Vintage - Does anyone still make a bottom bracket dynamo? - Im trying to help a friend power some lights on the cheap. Light theft is a big problem here, so I want to avoild a battery powered removable light. It seems like a bottom bracket dynamo might be the best route since building...

www.bikeforums.net

Ah I see, it runs on the tyre in the same way

 

[vfr400]

Here's the sort of application where a friction drive makes sense. All up weight is 8.8kg. They don't make sense on a heavy MTB with knobbly tyres:

 

[Woosh]

wonder why he didn't do the test on a 10% hill.

 

[vfr400]

wonder why he didn't do the test on a 10% hill.

He did - 12% hill at 4:50!

 

[Woosh]

that section lasted for 15 seconds.
what would happen to his tyres if he climbs a little longer?

 

[vfr400]

that section lasted for 15 seconds.
what would happen to his tyres if he climbs a little longer?

2.147 microns of rubber would wear off per minute. After about 39 minutes, his legs would start to ache. Finally, after approximately 1 hour and 51 minutes, he'd have to get off and walk.

 

[flecc]

Ah I see, it runs on the tyre in the same way

The French, as ever, like to do things differently. Their Cybien-Sport has twin motors clamping the sides of the rear wheel on a rubberised rim section, driving it dynamo fashion.

At 15.5 mph the motors release their grip on the rim:

 

[vfr400]

The French, as ever, like to do things differently. Their Cybien-Sport has twin motors clamping the sides of the rear wheel on a rubberised rim section, driving it dynamo fashion. At 15.5 mph the motors release their grip on the tyre:

I was going to throw out my old food mixer yesterday. Now I know what to do with it.

 

[Woosh]

2.147 microns of rubber would wear off per minute. After about 39 minutes, his legs would start to ache. Finally, after approximately 1 hour and 51 minutes, he'd have to get off and walk.

I reckon the heat from friction would melt the rubber on his tyre in about 3 minutes climbing.

 

[RossG]

I was going to throw out my old food mixer yesterday. Now I know what to do with it.

Not a bad idea vfr, remember the Sinclair C5 used a washing machine motor !

 

[mike killay]

Not a bad idea vfr, remember the Sinclair C5 used a washing machine motor !

Although it was later famously said that the C5 was powered by a washing machine motor, the motor was in fact developed from a design produced to drive a truck cooling fan. ... The C5's electronics were produced by MetaLab, a Sinclair spin-off.

 

[RossG]

The Sinclair C5 was built at the Hoover washing machine factory in Merthyr Tydfil, Wales. The motor was I believe a Polymotor built in Italy but interestingly they also made washing machine motors for Hoover hence all the confusion. The bodywork was manufactured in Taiwan and the whole thing pieced together in Wales.

I have a small collection of original Sinclair radios including the Wrist Radio, apparently extremely rare. At one time I owned several of his ZX81 computers which I sold off to a University.
Paradoxically Sir Clive Sinclair's business ideas all went down the drain and he was given a £10.000 handshake by his Government backers, if I'd have had enough of his old stuff I could have made more money now by selling it than he ever did.

 

[gsm.terra]

The Sinclair C5 was built at the Hoover washing machine factory in Merthyr Tydfil, Wales. The motor was I believe a Polymotor built in Italy but interestingly they also made washing machine motors for Hoover hence all the confusion. The bodywork was manufactured in Taiwan and the whole thing pieced together in Wales.

I have a small collection of original Sinclair radios including the Wrist Radio, apparently extremely rare. At one time I owned several of his ZX81 computers which I sold off to a University.
Paradoxically Sir Clive Sinclair's business ideas all went down the drain and he was given a £10.000 handshake by his Government backers, if I'd have had enough of his old stuff I could have made more money now by selling it than he ever did.

It would be interesting to know the law on driving a c5 nowadays?

 

[RossG]

The C5 had a max speed of 15mph how convenient is that !

 

[vfr400]

The C5 had a max speed of 15mph how convenient is that !

I'm pretty sure it was 12 mph, which was the law then.

 

[gsm.terra]

Then of course came the zike

https://en.wikipedia.org/wiki/Sinclair_Zike

 

[gsm.terra]

And the zeta