http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: "MIT re-invents the wheel, for bicycles" en Wed, 10 Jun 2026 04:36:58 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=145#post-966 Fri, 18 Dec 2009 00:39:39 +0000 Kim 966@http://citycyclingedinburgh.info/bbpress/ <p>Now there is an idea for the Edinburgh Vélib scheme should it ever happen. OK so they might need to change the smart phone bit, but then again that could be use as a way of hiring the bike. It has electrical assistance to get the rider up the hills, it has built in security, and it even collects environmental data in real time for the council. What is not to like?</p> <p>Well the council would rather not have the NOx data, as that would mean they would actually have to <em>do</em> something about it, rather than just ignoring the issue as they do now. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=145#post-958 Thu, 17 Dec 2009 18:51:23 +0000 chdot 958@http://citycyclingedinburgh.info/bbpress/ <p>More info, inc. designer's web site</p> <p><a href="http://www.bikebiz.com/news/31571/The-wheel-of-the-future" rel="nofollow">http://www.bikebiz.com/news/31571/The-wheel-of-the-future</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=145#post-849 Tue, 15 Dec 2009 17:46:35 +0000 steveo 849@http://citycyclingedinburgh.info/bbpress/ <p>Ooops embarrassingly for my first post i've picked up the wrong numbers.</p> <p><a href="http://en.wikipedia.org/wiki/Kinetic_energy" rel="nofollow">http://en.wikipedia.org/wiki/Kinetic_energy</a></p> <p>Ek= 1/2(mv2)<br /> Ek= 0.5*100*(6.7*6.7) = 2248 joules </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=145#post-842 Tue, 15 Dec 2009 16:25:46 +0000 steveo 842@http://citycyclingedinburgh.info/bbpress/ <p>I did some calculations a year or so ago i had a similar idea...</p> <p>Travelling at 15 mph or 6.7 m/s and weighing 100kg inc bike you'd have about 630 Joules of energy. Braking over a 5 second period you would generate about 120w, not bad but you would need a really clever dynamo to recover any thing like that and still be an efficient drive motor. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=145#post-841 Tue, 15 Dec 2009 16:11:32 +0000 chdot 841@http://citycyclingedinburgh.info/bbpress/ <p>"wind up"...</p> <p>All a bit odd. Even if it were super-efficient there's not too much energy to be saved when you brake. So does it detect when you are freewheeling and become a dynamo (slowing you down)?</p> <p>How big a battery/capacitor can you get in the hub with a motor? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=145#post-839 Tue, 15 Dec 2009 15:52:31 +0000 LaidBack 839@http://citycyclingedinburgh.info/bbpress/ <p>This must be a wind up wheel then.</p> <p>Says there are no additional batteries?* </p> <p>* Ah.. you mean that the batteries rotate in hub? Sounds like an evil plan. </p> <p>PS - Interesting to note that the biggest buyers of electric bikes are in flat countries! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=145#post-836 Tue, 15 Dec 2009 15:33:37 +0000 chdot 836@http://citycyclingedinburgh.info/bbpress/ <p><a href="http://www.guardian.co.uk/technology/blog/2009/dec/15/mit-copenhagen-wheel-green-bike">Technology | guardian.co.uk</a></p> <p><a href="http://www.youtube.com/watch?v=S7y3qIQu3Gc" rel="nofollow">http://www.youtube.com/watch?v=S7y3qIQu3Gc</a></p> <p>Note lack of cars in centre of city.... </p>