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Energy efficiency is expressed in terms of fuel economy: [2] distance per vehicle per unit fuel volume; e.g., km/L or miles per gallon (US or imperial). distance per vehicle per unit fuel mass; e.g., km/kg. [11] distance per vehicle per unit energy; e.g., miles per gallon equivalent (mpg-e).
For a flat criterium at 40 km/h, 1 km circuit, 4 corners per lap, 10 km/h speed loss at each corner, one hour duration, there would be 160 corner "jumps". For 90 kg rider and bike, this adds roughly one third effort compared to the same ride at a steady speed, and a mass reduction of 10% of the total system weight (bicycle, rider, and luggage ...
In 1933, Wiley Post repeated his 1931 circumnavigation by aeroplane, but this time solo, using an autopilot and radio direction finder. He made the first solo aerial circumnavigation in a time one day faster than his previous record: 7 days, 19 hours, 49 minutes, in which he covered 25,110 kilometres (15,600 mi), but did not cross the equator.
Guinness certified the record as covering 1,725 miles (2,776 km) in 5 days 18 hours and 3 minutes, beating Rockett's time by 3 hours and 5 minutes. [71] On 3 September 2020, Marcia Roberts became the first female to record the journey starting at Lands End, by bike, in a time of 11 days, 13 hours & 13 minutes and set a Guinness World Record. [72]
44 hours and 6 minutes 8 January 1980 10 January 1980 Retains record for circumnavigation using only scheduled transportation. [26] Air France: 32 hours 49 minutes and 3 seconds 12 October 1992 13 October 1992 Concorde FAI "Westbound Around the World" world air speed record from Lisbon, Portugal. [27] [28] [29] Michel Dupont and Claude Hetru
The specific energy content of a fuel is the heat energy obtained when a certain quantity is burned (such as a gallon, litre, kilogram). It is sometimes called the heat of combustion. There exists two different values of specific heat energy for the same batch of fuel. One is the high (or gross) heat of combustion and the other is the low (or ...
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The optimal speed varies with the type of vehicle, although it is usually reported to be between 35 and 50 mph (56 and 80 km/h). For instance, a 2004 Chevrolet Impala had an optimum at 42 mph (68 km/h), and was within 15 percent of that from 29 to 57 mph (47 to 92 km/h). Simple model for energy vs vehicle speed.