No Tech Magazine

Ride Your Bike Faster or With Less Effort Using a Partial Fairing

The rolling friction of the tyres is the main resistance acting on a bicycle at speeds below 10 km/h (6 mph). At higher speeds, air resistance becomes far more important. It accounts for more than 80 percent of the total force acting to slow the vehicle at a speed of 35 km/h (22 mph). At this speed, it would take a power output of 345 watts just to overcome air drag when riding an upright commuting bike (on a level road in calm conditions). Riding a velomobile (a recumbent cycle with a fairing) can lower air resistance dramatically, reducing power to overcome drag to about 30 watts at a speed of 35 km/h.

However, velomobiles are expensive. A much cheaper option is the use of a partial fairing. These wind screens, made of shatter resistant polycarbonate plastic, are mounted at the handlebars. A partial fairing is placed so that the rider is able to see over it, not through it. Apart from reducing air resistance, it is also an effective shield against bugs, rain, cold air, and road debris.

Partial fairings are available for different types of upright bicycles, and for recumbents. They weigh between 600 grams and 1.5 kg, depending on the model, including mounts. These accessoiries, which can often be seen on motorcycles, are relatively unknown to cyclists, mainly because they are outlawed in conventional bicycle racing.

When used in combination with a road bike in touring position (with the hands on the handlebar), a partial fairing brings the power required to overcome air resistance at 35 km/h down to 157 watts. This compares to 220 watts for an unfaired road bike in touring position, and to 176 watts for an unfaired road bike in (a much less comfortable) crouched position and wearing tight clothing. A partial fairing on a road bike thus offers a similar advantage to that of an unfaired recumbent (148 watts). With a headwind, the advantage of improved aerodynamics becomes even larger. One disadvantage of fairings is their sensitivity for crosswinds gusts. It takes some practice to get used to them.

The numbers above were taken from "Bicycling Science" (third edition), by David Gordon Wilson, pp 188. The result for the partial fairing concerns an older model, so it might be an underestimation. Picture: a small partial fairing by Zzipper.

The Culticycle: a Pedal-Powered Tractor

"The Culticycle is a pedal powered tractor that can cultivate, seed, spray, or pull gear for most low horsepower tasks. Small tractors do many jobs very well and very fast, but also consume fuel, compact soil, cost a lot, and cause physical damage to the operator -– mainly spine and joint problems. Many of their jobs could be done, slower but better, by human pedal power.

This prototype consists of:

• the front ends of 2 bikes welded together at 42” on center;
• a lawn tractor differential mounted in a unistrut rectangle for a rear end , with 3/4" round axles and 20” ATV tires;
• a bike frame welded above the rear end with motorcycle sprocket and chain driving the differential (a springloaded idler tensions the chain);
• a belly mount lift to hold cultivators, seeders, etc.;
• a bike handlebar, separate from the bike frame and joined to the front end, steering the front wheels.

The materials are rebar, unistrut, landscape rake tines, and parts from bikes, an ATV, and a lawn tractor. It attempts to show that human pedal power can do some jobs of small tractors, albeit in twice the time, and that the design can be simple enough that no extra weight is needed for traction. The effort required is similar to climbing a 10 degree slope on a seventies Schwinn 3 speed. This prototype was built for testing: a more easily buildable version is in the works."

Found at Farmhack. This is begging for an open modular approach. Thanks to Tim Cooke.

Classic Italian Racing Bicycles

The Vintage Italian Racing Bicycle Pool on Flickr has more than 1,000 pictures. Above: De Rosa, 1973, by classic8tubes. Related: Cars, out of the way.

Cargo Cycle for Egg Deliveries

The Pashley Model CT2 is described as "a really handsome, well built and strong light delivery vehicle for confectioners, egg deliveries, grocers, accumulator stations, etc."

Found at the Museum of Tradesman's Delivery Bikes, which has a collection of (mostly) English cargo bicycles dating from 1905 to 1982. This is one of the few tricycles on the blog.

Related: Tandem Cargo Tricycle (1940) & More Vintage Dutch Carrier Bikes.

 

Designing for Velomobile Diversity

"Velomobiles currently appeal to niche, enthusiast markets through a range of both low scale production and D.I.Y processes."

"This paper explores the current limitations in promoting velomobiles as a commuter alternative to the automobile in that it proposes velomobile diversity be approached through the application of dynamic, emotive styling, vehicular packaging variations and functional storage, together with the use of sustainable construction materials with techniques that reduce assembly and fabrication costs."

"To this end, the paper discusses two conceptual case studies that explore applied industrial design processes, diverse construction and alternative manufacturing techniques. Both are positioned outside current fabrication processes, where one explores ‘natural’ production – specifically, the pre-harvest deformation of bamboo with shape tessellation to reduce parts complexity whilst allowing natural processes to fulfil pre-determined forms – and the other reuses post-consumer waste in an interminably variable tensegrity frame construction designed for continued open-source development."

Designing for Velomobile Diversity: Alternative opportunities for sustainable personal mobility (PDF). Alexander Vittouris and Mark Richardson, 7th International Velomobile Seminar, september 2012. Picture: Softshell concept velomobile.

Previously: Electric velomobiles: as fast and comfortable as automobiles, but 80 times more efficient.

Pedal Powered Un-Knitting Machine

"A highly unusual bicycle, designed to help recycle unwanted woollen clothes, unravels any clothing item back into its pre-knitted form. It has been selected as one of the best student design projects of 2012 by the British National Centre for Craft and Design."

"The un-knitting machine is based on pedal power and built around an old bicycle frame. The un-knitter sits on a chair pedalling and wool passes through steam coming out of a kettle before being collected on a spindle. The machine was designed by Imogen Hedges, a student at Kingston University." Read more. Via Treehugger.

Related:

• Pedal powered wool carding machine
• Rocking chair knits winter hats
• Pedal powered electronic waste recycling machine
• When low-tech goes IKEA
• Pedal powered farms and factories: the forgotten future of the stationary bicycle
• The short history of early pedal powered machines

Bicycle Trailer with Solar Panel Charges Electric Bicycle

"The electric bicycle has become a very long way in recent years. However, the lack of luggage space and limited range of the battery makes the electric bike less suited to long distances. Solarwind, designed by architect Raf Van Hulle, offers a solution.

The trailer provides extra luggage space and is fitted with a solar panel to keep the electric bicycle's battery charged."

Solarwind.

Cargo Cycles Database

Yes, it's written in German. But nowhere else will you find such a complete database showing and describing all cargo cycles available on the market today.

Moreover, the information is easy to navigate and you can consult the specifications of the vehicles without even a basic knowledge of foreign languages. The description of most models also includes a link to the website of the manufacturer. Check out the Nutzrad Cargo Cycle Database. 

Read more:

Cargo cyclists replace trucks drivers on European city streets.

Pedal Powered Electronic Waste Recycling Machine

"The bicyclean is a safe, affordable, and efficient alternative for harvesting electronic waste in developing regions. The bicyclean is a modified bicycle, where a processing chamber replaces the rear wheel and an external steel frame supports the rear hub. Processing of the circuit boards occurs within the sealed chamber and the particles are removed in a covered tray. A feed tube presses circuit board pieces into a large grinding wheel and become pulverized."

"The particles pass a magnet that extracts ferrous metal particles. The particles then flow over a small eddy current rotor, which is positioned underneath the grinding wheel and powered by a 3:1 gear ratio with the bicycle chain. The changing magnetic fields of the eddy current rotor repulse conducting metal, but have no effect on non-metals; the metal particles are projected horizontally while the nonmetals fall vertically, separating particles in the bottom collection tray. The bicyclean requires a single operator."

Read more: Bicyclean. Via Co.EXIST.

Velomobiling

A fifteen minute ride in a velomobile. Previously: The velomobile: high-tech bike or low-tech car?

Pedal Powered Wool Carding Machine

The Cyclocarder by Fibershed-contributor Katharina Jolda is a wonderful update to the article on pedal powered machines. The Cyclocarder can turn your backyard, community center, or farm into a human powered wool processing station.

When Low-Tech Goes IKEA

What happens when two industrial design students from Sweden end up in Kenya creating a pedal powered machine for small-scale farmers who are often illiterate and speak more than 60 languages? You get a do-it-yourself design that seems to have come out of the IKEA factories - pictoral manuals included.

"Made in Kenya", the bachelor project of Niklas Kull and Gabriella Rubin, is a textbook example of low-tech made accessible to everybody, regardless of their native tongue and language skills.

Flywheel Bicycle

Maxwell von Stein's bicycle invention uses a flywheel to store energy. Instead of braking, he can slow the bicycle by transferring the kinetic energy from back wheel into the flywheel -- which spins between the bars of the frame. Then Max can send the flywheel energy back to the wheel when he wants a boost. Watch the video. Thank you, Rasmus.

Related: Job Ebenezer's Dual Purpose Bicycle, mentioned in the article on pedal powered machines.

Pedal Powered Machines

1. Pedal powered farms and factories: the forgotten future of the stationary bicycle
2. Bike powered electricity generators are not sustainable
3. The short history of early pedal powered machines

Pedal Powered FlatBed Truck

"Originally designed to serve the load carrying requirements of the Tri-Sled factory, the FlatBed Truck is a high-bulk load carrier. We use one of these for getting around our local industrial estate, transporting frames and fairings to our powder-coating and painting contractors, or picking up steel and other oversized materials."

"The FlatBed Truck is far more convenient than carting large items to and from a car or van. With this maneuverable vehicle, you can simple roll straight in and out of your business or factory. It even serves as a handy rolling work bench for working outside on sunny days."

"The FlatBed Truck is also incredibly easy to store. Just flip it up on its end when not in use, and use the rear rolling wheels to move it against a wall or into a small space. The rolling wheels also serve as a back bump stop." Trisled FlatBed Truck.