If we boost the research on pedal powered technology - trying to make up for seven decades of lost opportunities - and steer it in the right direction, pedals and cranks could make an important contribution to running a post-carbon society that maintains many of the comforts of a modern life. The possibilities of pedal power largely exceed the use of the bicycle.
Pedalling a modern stationary bicycle to produce electricity might be a great work-out, but in many cases, it is not sustainable. While humans are rather inefficient engines converting food into work, this is not the problem we want to address here; people have to move in order to stay healthy, so we might as well use that energy to operate machinery. The trouble is that the present approach to pedal power results in highly inefficient machines.
Continue reading "Bike powered electricity generators are not sustainable" »
Ever since the arrival of fossil fuels and electricity, human powered tools and machines have been viewed as an obsolete technology. This makes it easy to forget that there has been a great deal of progress in their design, largely improving their productivity.
The most efficient mechanism to harvest human energy appeared in the late 19th century: pedalling. Stationary pedal powered machines went through a boom at the turn of the 20th century, but the arrival of cheap electricity and fossil fuels abruptly stopped all further development.
Continue reading "The short history of early pedal powered machines" »
Recumbent bikes with bodywork evoke a curious effect. They look as fast as a racing car or a jet fighter, but of course, they're not.
Nevertheless, thanks to the recumbent position, the minimal weight and the outstanding aerodynamics, pedalling a "velomobile" requires three to four times less energy than pedalling a normal bicycle.
This higher energy efficiency can be converted felt in terms of comfort, but can also be utilised to attain higher speeds and longer distances - regular cyclists can easily maintain a cruising speed of 40 km/h (25 mph) or more. The velomobile thus becomes an excellent alternative to the automobile for medium distances, especially in bad weather.
Continue reading "The velomobile: high-tech bike or low-tech car?" »
Some readers have observed that we haven't paid any attention to one of the most low-tech innovations ever - the humble bicycle. We noted the sex-appeal of pedal power (and this concerns both men and women), but that's about it. So, since you asked for it, here is our concise but clear point of view on these human powered two-wheelers.
The human body can deliver enough power to drive computers, television sets and washing machines – but it does go hand in hand with lots of sweat.
Eco-tech boffins dream of self-sufficient gadgets: mobile phones fed by solar energy, heartbeat-powered music players. However, the potential of these energy sources is much too small. Handles, cranks and biking machines on the other hand, do have a promise to be a powerful energy source. Swinging a crank for fifteen minutes is enough to power a mobile phone. Less than an hour of pedalling a bike can power larger machines. The only thing missing is a remedy for laziness.
From the earliest civilisations right up to the start of the Industrial Revolution, humans used sheer muscle power, organisation skills and ingenious mechanics to lift weights that would be impossible to handle by most power cranes in operation today.
We don't need better batteries, we need better cars.
