World Solar Challenge: spotted in action

This updated table shows the 35 (out of 42) cars in the World Solar Challenge which have been spotted on the track or on the road as at 20:40 on Wed, Oct 4 (Darwin time). There are links to photos and to team social media. The third column of the table shows the car class (or, for Cruisers, the number of seats). For more detailed information about the teams, see my annotated teams list.

2 Cha University of Michigan  – see photo
3 Cha Nuon Solar Team  – see photo
4   Cha Antakari Solar Team 
5 2-st Singapore Polytechnic  – see video
7 Cha Adelaide University  – see photo
8 Cha Punch Powertrain Solar Team  – see photo
9 4-st Iowa State University (PrISUm)  – see photo
10   Cha Tokai University 
11 4-st Bochum University of Applied Sciences  – see photo
12   Cha Cambridge University  – tragically, Cambridge is out of the race
14   3-st Flinders University 
15 Cha Western Sydney Solar Team  – see photo
16 Cha Stanford Solar Car Project  – see photo
18 Cha MARA University of Technology / EcoPhoton  – see photo
20 Cha Durham University  – see photo
21 Cha Solar Team Twente  – see video
22 Cha MDH Solar Team  driving with a temporary battery (problem described here)
23   4-st University of Tehran  – no car yet
25 Cha Nagoya Institute of Technology  – see photo
28   Cha Korea National University of Transportation 
30 2-st Clenergy Team Arrow  – see photo
32 Cha Principia Solar Car Team  – see photo
34 Cha R.V. College of Engineering  – see photo
35 2-st Hong Kong Institute of Vocational Education  – see photo
37 Cha Goko High School  – see photo
38 Cha North West University  – see video
40 5-st Solar Team Eindhoven  – see photo
42 2-st TAFE SA  – see photo
43 Cha Australian National University  – see video
45 5-st Lodz Solar Team  – see photo
46 Cha JU Solar Team  – see video
49 2-st Siam Technical College  – see video
52 Adv University of Illinois at Urbana-Champaign  – see photo
53   Adv Mississippi Choctaw High School  – no car yet
70 Cha Sonnenwagen Aachen  – see video
71 Cha Istanbul Technical University  – see photo
75 4-st University of New South Wales / Sunswift  – see photo
77 Cha University of Toronto / Blue Sky  – see photo
82 Cha Kookmin University Solar Team  – see photo
88 Cha Kogakuin University  – see photo
94 2-st University of Minnesota  – see photo
95 2-st Kaohsiung / Apollo  – see photo


Travelling across Australia: Ten things to spot

On October 8, teams in the World Solar Challenge begin their race from Darwin to Adelaide. Here are 10 things for travellers across Australia to look out for.

1. The Magellanic Clouds

The Magellanic Clouds are two small galaxies – at 160,000 light-years and 200,000 light-years, the nearest visible galactic neighbours of our Milky Way. They can be seen in the Southern Hemisphere, away from towns. The Australian Outback is the perfect place to observe them.


The Magellanic Clouds (photo: ESO/S. Brunier)

2. The Southern Cross

The Southern Cross (Crux) is a constellation appearing on the flags of many countries in the Southern Hemisphere, including Australia. It consists of four bright stars, with a fifth being visible to the naked eye in good conditions. The constellation can be located with the aid of the pointer stars Alpha Centauri and Beta Centauri. It can also be used to determine the South Celestial Pole. The star at the “top” of the Cross (Gamma Crucis) is a red giant. The fifth star (Epsilon Crucis) is an orange giant.


The Southern Cross, pointers, and Magellanic Clouds (image: Michael Millthorn)

3. The wedge-tailed eagle

The wedge-tailed eagle (Aquila audax)) is Australia’s largest bird of prey, and a national icon. It can be seen around Australia, either in the sky, or snacking on roadkill.


Wedge-tailed eagle (photo: Fir0002/Flagstaffotos)

4. The red kangaroo

The red kangaroo (Macropus rufus) is the largest living marsupial, and is found throughout central Australia, in areas with less than 500 mm rainfall. It is an Australian national icon, as well as being a major traffic hazard at dawn and dusk.


Red kangaroos (photo: Jenny Smits)

5. The sand goanna

The sand goanna (Varanus gouldii) is a large monitor lizard, growing to about 1.5 metres. It is found across much of Australia.


Sand goanna (photo: Alan Couch)

6. The thorny devil

The thorny devil (Moloch horridus) is found in arid, sandy areas of western and central Australia. It lives mostly on ants.


The thorny devil (photo: Bäras)

7. Magnetic termites

Magnetic termites (Amitermes meridionalis) are one of two Australian termite species building mounds that align north–south. They can be found in the vicinity of Darwin. The mound orientation appears to be a temperature-control mechanism.


A magnetic termite mound (photo: brewbooks)

8. Sturt’s desert pea

Sturt’s desert pea (Swainsona formosa) grows in arid regions of Australia. It is the floral emblem of the state of South Australia.


Sturt’s desert pea (photo: Fir0002/Flagstaffotos)

9. The desert grasstree

The desert grasstree (Xanthorrhoea thorntonii) is a grasstree found in arid regions of western and central Australia. Like the other 27 species of grasstree (Xanthorrhoea spp.), it is endemic to Australia, and a symbol of the Australian landscape.


The desert grasstree (photo: Mark Marathon)

10. Opal

Opal is a gemstone form of hydrated silicon dioxide. The town of Coober Pedy in South Australia is a major source.


Opal from Coober Pedy (photo: Dpulitzer)


World Solar Challenge: about the Cruisers

To illustrate the World Solar Challenge Cruiser-class scoring for 2017, here is the calculation for Kogakuin’s 2015 car (above). Disclaimer: this is, of course, my personal interpretation of the regulations.

Notice that Cruisers are not in a race this year – any arrival time during the 11:00 to 14:00 time window on Friday is OK.

Arrival time

Friday 11:35.
Inside window? YES

Energy efficiency

Battery capacity, Q = 14.855 kWh
Number of recharges, n = 1 (at Alice Springs)
External energy use, U = (n + 1) Q = 29.71
Person-km, C = 3022
Energy efficiency, E = C / U = 101.7
Highest energy efficiency, E* = 203.6 (Eindhoven)
Relative energy efficiency, E / E* = 0.4996

Practicality

Practicality P = 51.75
Highest practicality, P* = 84.5 (Eindhoven)
Relative practicality, P / P* = 0.6124

Total Score

Total score, S = 80 E / E* + 20 P / P* = 39.97 + 12.25 = 52.22

This is a massively lower score for Kogakuin than was actually awarded in 2015. This year, the World Solar Challenge Cruiser Class is all about energy-efficiency, carrying passengers, and practicality. Expect to see the four-seat and five-seat Cruisers (like the Polish car below) running with every seat occupied.


Silly Season in the Sky (again)

It’s apparently time for lunatic end-of-the-world prophecies again. The latest relates to a “great red dragon” in the sky (a reference to Revelation 12):

Turns out that this is a double image of Saturn, taken way back in 1983 by the Infrared Astronomical Satellite (IRAS). Saturn was then at RA 13h45m18.2s, DEC -08d13m07s.

It’s a false-colour image (i.e. not red at all), being taken at 100 microns, in the infrared region of the spectrum. But with enough spin, apparently it can be made to sound scary.

In the final version of the infrared sky survey, this artefact was blacked out, since it doesn’t reflect any actual stellar infrared sources (just a planet that moves around). Of course, that removal got the conspiracy-theory nutters going.


World Solar Challenge: route notes

Following on from my route map for the World Solar Challenge – all 3,000 km or 1,900 miles of it – here are some personal route notes (revised from 2015). The graph below (click to zoom) shows approximate altitudes (calculated by overlaying the route on an altitude raster). The highest point on the route (about 730 m) is 20 km north of Alice Springs, although the steepest hill (Hayes Creek Hill, summit 203 m) is about 170 km from Darwin.

Darwin – Start


Solar Team Eindhoven’s Stella starts the race in 2013 (photo: WSC)

The city of Darwin marks the start of the race.

Katherine – 322 km – Control Stop 1


En route to Katherine in 2011 (photo: UC Berkeley Solar Vehicle Team)

The town of Katherine (on the Katherine River) is a gateway to Nitmiluk National Park. It also serves the nearby Royal Australian Air Force base. The average maximum October temperature is 37.7°C.

Daly Waters – 588 km – Control Stop 2


The famous Daly Waters pub

Daly Waters is a small town with a famous pub. The Eindhoven team left a shirt there in 2015.

Dunmarra – 633 km


University of Toronto’s Blue Sky Solar team leaves the Dunmarra control stop in 2013 (photo: Blue Sky Solar)

Dunmarra once served the Overland Telegraph Line. Today it is little more than a roadhouse, motel, and caravan park. In previous races, this was a control stop.

Tennant Creek – 988 km – Control Stop 3


Tennant Creek (photo: Tourism NT)

Tennant Creek (population about 3,500) is a small town serving nearby mines, cattle stations, and tourist attractions.

Karlu Karlu / Devils Marbles Conservation Reserve


Nuon Solar Team’s Nuna7 drives by the Devils Marbles in 2013 (photo: Jorrit Lousberg)

The 1,802 hectare Karlu Karlu / Devils Marbles Conservation Reserve lies along both sides of the Stuart Highway about 100 km south of Tennant Creek. It is home to a variety of reptiles and birds, including the fairy martin (Petrochelidon ariel) and the sand goanna (Varanus gouldii). Race participants, of course, don’t have time to look (unless, by chance, this is where they stop for the night).

Barrow Creek – 1,211 km – Control Stop 4


Barrow Creek Roadhouse and surrounds (photo: Adrian Kitchingman)

Barrow Creek once served the Overland Telegraph Line and nearby graziers, but is now nothing but a roadhouse. The Telegraph Station is preserved as a historical site.

Ti Tree – 1,300 km


Nuon Solar Team’s Nuna6 drives by a fire between Tennant Creek and Alice Springs in 2011 (photo: Hans Peter van Velthoven)

Ti Tree is a small settlement north of Alice Springs. Much of the local area is owned by the Anmatyerre people. In previous races, this was a control stop.

Alice Springs – 1,496 km – Control Stop 5


Alice Springs (photo: Ben Tillman)

Alice Springs is roughly the half-way point of the race.

Kulgera – 1,766 km – Control Stop 6


Sunset near Kulgera (photo: “dannebrog”)

Kulgera is a tiny settlement 20 km from the NT / SA Border. The “pub” is Kulgera’s main feature.

NT / SA Border – 1,786 km


Entering South Australia (photo: Phil Whitehouse)

The sign at the Northern Territory / South Australia border shows Sturt’s Desert Pea (Swainsona formosa), the floral emblem of the state of South Australia.

Coober Pedy – 2,178 km – Control Stop 7


Coober Pedy (photo: “Lodo27”)

The town of Coober Pedy is a major centre for opal mining. Because of the intense desert heat, many residents live underground.

Glendambo – 2,432 km – Control Stop 8


The Belgian team’s Indupol One leaves Glendambo control stop in 2013 (photo: Punch Powertrain Solar Team / Geert Vanden Wijngaert)

Glendambo is another small outback settlement.

Port Augusta – 2,719 km – Control Stop 9


Port Augusta (photo: “Deborah & Kevin”)

At Port Augusta, the highway reaches the Spencer Gulf. From this point, traffic becomes much heavier, which makes life more difficult for the drivers in the race.

Adelaide – Finish


Adelaide makes quite a contrast to that lengthy stretch of desert (photo: “Orderinchaos”)

Adelaide, the “City of Churches,” is the end of the race. The official finish line marks 3,022 km from Darwin.


The R100 and the R101

An instructive saga in the history of engineering is the story of the British airships R100 and R101. As part of a grand social experiment, the R100 was built by private industry (it was designed by Barnes Wallis), while the R101 was built by the British government (specifically, by the Air Ministry, under Lord Thomson). The R100 worked fine, and made a test flight to Canada in August 1930 (the trip took 78 hours). Here is the R100 over a Toronto building:

The R100 was huge. Here is a size comparison of the R100 (219 m long) and an Airbus A380 (73 m long):

While the government-built R101 used servo motors to control its gigantic rudder, the R100 team had worked out that the rudder could actually be operated quite easily by hand, using a steering wheel and cables. The government-built R101 was beset by poor choices, in fact. It contained overly heavy engines, a steel frame, and too much dead weight overall. After construction, the R101 had to be lengthened by inserting a new 14-metre section in the centre, in order to increase lift. This alteration caused a number of problems. Its design also allowed the internal hydrogen-filled gasbags to chafe against the frame, there were serious problems with the outer covering, and several “innovative” design ideas were never properly tested.

There was enormous political pressure for the R101 to fly before it was ready to do so. On the evening of 4 October 1930, it departed for India with a crowd of VIPs on board. It never arrived, crashing in bad weather over France, and bursting into flames. The disaster led to the R100 also being grounded, and the British government abandoned any thoughts of flying airships (as the rest of the world was to do after the Hindenburg disaster).

There are all kinds of lessons to be drawn from the saga of the R100 and the R101. One of them is that optimism is not a viable strategy for safety-critical engineering. Another is that engineers test things. As Kipling says, “They do not preach that their God will rouse them a little before the nuts work loose.” A third is that risky designs and fixed deadlines simply do not mix.