Search found 130 matches

by StephenW
23 Aug 2018, 6:37pm
Forum: Non-standard, Human Powered Vehicles
Topic: Water-cooled Sturmey Archer drum brakes
Replies: 19
Views: 3703

Re: Water-cooled Sturmey Archer drum brakes

[XAP]Bob wrote:Water takes 4200J/degree/kg
Air takes 720J/degree/kg

Additionally water is significantly more dense, so you get more water around something, and has better thermal conductivity...


Don't forget the latent heat of vapourisation!

If the water boils, it absorbs 2260000J/kg!
by StephenW
13 Aug 2018, 9:03pm
Forum: Bikes & Bits – Technical section
Topic: Front platform rack
Replies: 12
Views: 389

Re: Front platform rack

Perhaps you could get the brake boss rack and use jubilee clips to attach the brake mounting points to the fork legs?

It's probably not what you are after, but I have the Steco head tube rack and I like it.
by StephenW
17 Jul 2018, 9:47pm
Forum: Campaigning & Public Policy
Topic: Why isn't there a cycles on trains campaigns from Cycling UK?
Replies: 227
Views: 16572

Re: Why isn't there a cycles on trains campaigns from Cycling UK?

I sometimes take my SWB recumbent on the train. It fits OK in a standard bike space. A LWB recumbent would be a different matter - it would be classed as a tandem in my view. I think that a maximum length should be defined for a "standard bicycle", and anything longer than this is classed ...
by StephenW
16 Jul 2018, 8:51pm
Forum: Campaigning & Public Policy
Topic: Why isn't there a cycles on trains campaigns from Cycling UK?
Replies: 227
Views: 16572

Re: Why isn't there a cycles on trains campaigns from Cycling UK?

Vorpal asked: What are cycle spaces, and where do Tandem and Trailer go? I think it would be good if a standard bicycle were defined. If the standard bicycle doesn't fit easily in all the cycle spaces, they are not cycle spaces. The standard bicycle should be large - I suggest the largest-framed men...
by StephenW
16 Jul 2018, 8:07pm
Forum: Bikes & Bits – Technical section
Topic: Shimano 12-speed
Replies: 51
Views: 4421

Re: Shimano 12-speed

I think perhaps these cassettes with very large sprockets and lots of gears could be useful for recumbents, although I am sure this is the last thing the designers had on their minds! I have a few reasons for thinking this: -Recumbents benefit from having low gears, but using very small chainrings t...
by StephenW
14 Jul 2018, 11:48am
Forum: Non-standard, Human Powered Vehicles
Topic: recumbent riders where are we...
Replies: 176
Views: 145495

Re: recumbent riders where are we...

I'm in Loughborough.

There is also a guy who goes to the same Pilates class as me who sometimes rides a recumbent.
by StephenW
13 Jun 2018, 10:05am
Forum: Touring & Expedition
Topic: Pashley type bikes
Replies: 26
Views: 2931

Re: Pashley type bikes

I have ridden a Dutch roadster ... they don't go up hills ... I think that riding in different positions uses muscles in different ways. Therefore, if someone who is used to a fairly aggressive riding position tries riding in a very upright position, they may be lacking in power because they are no...
by StephenW
13 Jun 2018, 9:31am
Forum: Non-standard, Human Powered Vehicles
Topic: Shifters for hamster bars
Replies: 12
Views: 734

Re: Shifters for hamster bars

I think it's good that your shifters have an indicator showing which gear you are in. Mine don't, and I find this a nuisance. It's easy to shift to the small chainring when coming to a stop, but not realising that the rear derailiuer is in a very small gear. It's then a pain trying to get moving aga...
by StephenW
11 Jun 2018, 9:05pm
Forum: Campaigning & Public Policy
Topic: Why isn't there a cycles on trains campaigns from Cycling UK?
Replies: 227
Views: 16572

Re: Why isn't there a cycles on trains campaigns from Cycling UK?

I suspect it might help towards such a policy if we cyclists were clearer about quite what we wanted. Yes, this is a good point. I can't speak for everyone, but I'll set out below what I would like to see. I've divided this up according to the type of rail route: commuter routes, fast inter-city se...
by StephenW
7 Jun 2018, 10:38pm
Forum: Bikes & Bits – Technical section
Topic: Gerard Vroomen on the future of bicycle tech
Replies: 67
Views: 2339

Re: Gerard Vroomen on the future of bicycle tech

I've been thinking a bit about some of the developments that have been discussed here, and whether they represent an improvement or not. 1x drivetrains From a logical point of view, there is usually little reason not to want a front derailer - they cause no inefficiency, don't weigh too much etc. Bu...
by StephenW
3 Jun 2018, 10:32pm
Forum: Campaigning & Public Policy
Topic: Continental-style traffic light junctions
Replies: 32
Views: 1312

Re: Continental-style traffic light junctions

One limitation is that that long wait will require a substantial reservoir for cyclists to wait to be allowed to cross. Only very large junctions are likely to have the space. Ideally these should have over/underpasses of good standard. For more "common or garden" junctions the continenta...
by StephenW
3 Jun 2018, 10:22pm
Forum: Non-standard, Human Powered Vehicles
Topic: Monoforks
Replies: 12
Views: 639

Re: Monoforks

In some case "rigid" forks have a certain amount of flex designed into them to give a more comfy ride, don't they? Perhaps it is harder to have this desirable flex without having undesirable flex when you have a monofork?
by StephenW
3 Jun 2018, 10:07pm
Forum: Campaigning & Public Policy
Topic: Disallow bans of only cyclists from (previously) all-purpose roads:only allow ban of same list of vehicles as for M-ways
Replies: 46
Views: 4027

Re: Disallow bans of only cyclists from (previously) all-purpose roads:only allow ban of same list of vehicles as for M-

It's junctions that are the problem though. That's where most bike accidents happen anyway, and it's easy to design paths such that junctions are harder to handle for cyclists and motorists alike, and therefore the road is more dangerous than it was without the path. In urban areas this is certainl...
by StephenW
3 Jun 2018, 9:55pm
Forum: Campaigning & Public Policy
Topic: Why isn't there a cycles on trains campaigns from Cycling UK?
Replies: 227
Views: 16572

Re: Why isn't there a cycles on trains campaigns from Cycling UK?

Loco-haulage offers: ... - marketing appeal: some potential passengers regard loco-hauled sets as higher status or as 'proper trains' and are more likely to use them when an MU would have them sticking to their cars. Similarly enthusiasts tend to like them and may deliberately pick routes or times ...