Human-powered transport

Sherpa carrying wood to Mount Everest base camp

Human-powered transport is the transport of person(s) and/or goods using human muscle power. Like animal-powered transport, human-powered transport has existed since time immemorial in the form of walking, running and swimming. Modern technology has allowed machines to enhance human-power.

Although motorization has increased speed and load capacity, many forms of human-powered transport remain popular for reasons of lower cost, leisure, physical exercise and environmentalism. Human-powered transport is sometimes the only type available, especially in underdeveloped or inaccessible regions.

Available muscle power

Road cyclist

In the 1989 Race Across America, one team (Team Strawberry)[1] used an experimental device comprising a rear wheel hub, a sensor, and a handlebar mounted processor, to measure each cyclist's power output.

In lab experiments an average "in-shape" cyclist can produce about 3 watts/kg for more than an hour (e.g., around 200 watts for a 70 kg (154 lb) rider), with top amateurs producing 5 watts/kg and elite athletes achieving 6 watts/kg for similar lengths of time. Elite track sprint cyclists are able to attain an instantaneous maximum output of around 2,000 watts, or in excess of 25 watts/kg; elite road cyclists may produce 1,600 to 1,700 watts as an instantaneous maximum in their burst to the finish line at the end of a five-hour-long road race.

Modes

Non-vehicular

Human-powered vehicles (HPVs)

Skateboards are propelled by pushing (one foot riding on board, one foot pushing on ground) or by gravity
Trikkes by shifting the rider's body weight

Land vehicles

Bicycles are the most efficient type of human-powered vehicle
Surrey style rental quadracycle built by the International Surrey Company

Skateboards have the advantage of being so small and light that users can easily carry them when not skating.

The most efficient human-powered land vehicle is the bicycle.[3] Compared to the much more common upright bicycle, the recumbent bicycle may be faster on level ground or down hills due to better aerodynamics while having similar power transfer efficiency.

Velomobiles are increasingly popular in colder and/or wetter countries due to the protection they offer against the environment. Freight bicycles are used to transport cargo. Cycle rickshaws can be used as taxicabs.

In 2013, Dutch cyclist Sebastiaan Bowier pedaled a fully faired recumbent streamliner for 200 m (660 ft) at 133.78 km/h (83.13 mph) at Battle Mountain, Nevada.[4]

Dutch cyclist Fred Rompelberg set a 268.8 km/h (167.0 mph) speed record at the Bonneville Salt Flats in Utah on October 3, 1995 while cycling in the wake of a motor dragster pace-car.[5] The wake of the pace-car reduced the aerodynamic drag against which Rompelberg pedalled to almost zero.[6]

Greg Kolodziejzyk set two world records recognized by both the International Human Powered Vehicle Association and Guinness (TM) World Records on July 17, 2006 on a race track in Eureka, California. The first record is for the most distance traveled in 24 hours by human power 1,041 km (647 mi), and the second for the worlds fastest 1,000 km (621 mi) time trial (23 hours, 2 minutes).[7] Both records were broken on August 6, 2010 by Christian von Ascheberg who drove 1,000 km (621 mi) in 19 hours, 27 minutes and managed to go 1,219 km (757 mi) in 24 hours with his Milan SL Velomobile. In the same race he also raised the 12-hour record to 664.97 km (413 mi), which is an average of 55.41 km/h (34 mph). [8]

In 1969, artists in a small Northern California town began the Kinetic sculpture race which has grown to a 42 mi (68 km), three-day all terrain, human-powered sculpture race and county wide event. It is held every year on the last weekend in May.

Aircraft

Fixed wing
MIT Daedalus human powered aircraft

The Pedaliante flew short distances fully under human power in 1936, but the distances were not significant enough to win the prize of the Italian competition for which it was built. The flights were deemed to be a result of the pilot's significant strength and endurance, and not attainable by a typical human. Additional attempts were made in 1937 and 1938 using a catapult system, launching the plane to a height of 9 m (30 ft). With the catapult launch, the plane successfully traveled the 1 km (0.62 mi) distance outlined by the competition, but was declined the prize due to the takeoff method.[9][10][11]

The first officially authenticated regularly feasible take-off and landing of a human-powered aircraft (one capable of powered takeoffs, unlike a glider) was made on 9 November 1961 by Derek Piggott in Southampton University's Man Powered Aircraft (SUMPAC).

Perhaps the best-known human-powered plane is the Gossamer Albatross, which flew across the English Channel in 1979.

The current distance and duration record recognised by the FAI, a straight distance of 115.11 km (71.53 mi) in 3 hours and 54 minutes, was achieved on 23 April 1988 from Heraklion on Crete to Santorini in a MIT Daedalus 88 piloted by Kanellos Kanellopoulos.

The current speed record is held by the Monarch B, built by a team at MIT in 1983, which won a Kremer Prize of £20,000 for sustaining a speed of over 30 km/h (19 mph) over a 1.5 km (1 mi) triangular course.

Helicopters

The first officially observed human-powered helicopter to have left the ground was the Da Vinci III in 1989. It was designed and built by students at Cal Poly San Luis Obispo in California, USA. It flew for 7.1 seconds and reached a height of 8 in (20 cm). The second was the Yuri I in 1994, designed and built by students at Nihon University in Japan. It flew for 19.46 seconds and reached an altitude of 20 cm (8 in). On 13 June 2013, the AeroVelo Atlas was the first to complete a flight that lasted 64 seconds and reached an altitude of 3.3 meters, thus winning the Sikorsky Prize.

Airships and balloons

French inventors have built man-powered airships and balloons. Solar balloons and solar airships are new types of balloons and airships.[12] Because lift is supplied through buoyancy, human power can be devoted to thrust.[13][14]

Watercraft

A Punt Pedalo
Birchbark canoe

Human-powered watercraft include prehistoric and well-known traditional and sporting craft such as canoes, rowing boats and galleys. The term human-powered boat is often used for more modern craft using propellers and water wheels for propulsion. These can be more efficient than paddles or oars and especially allow the use of the leg muscles which are generally stronger than arm muscles, even for non-athletes. In addition, there is little skill required for forward propulsion while looking forwards and craft such as pedalos are popular at resorts.

Hydrofoils

Hydrofoils have less water resistance at the highest speeds attainable by humans and are thus usually faster than displacement boats on short courses. The world speed record on water was set 27 October 1991 by MIT professor Mark Drela who pedalled a human-powered hydrofoil, "Decavitator", to 18.5 knots (21.3 mph)(9.53 meters/second) over a 100-meter course in Boston, Massachusetts, US.

Submarines

In 1989, the first human-powered International Submarine Race (ISR) was held in Florida with 17 craft. Since then nine more races have been held. The races themselves have been moved from the waters of Florida to the United States Naval Surface Warfare Center's Carderock Division David Taylor Model Basin in Bethesda, Maryland, and are held biennially. At the 9th ISR in 2007 (in which 23 submarines participated) several new records were set: A single-person craft, Omer5 achieved a record speed of 8.035 knots breaking the Omer team's previous record of 7.19 knots set by Omer 4 in 2004. Also Omer 6 snatched up a record for non-propeller driven craft with a speed of 4.642 knots.[15]

See also

References

External links

Air

Water

Land

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