World Solar Challenge Cruiser Scores

The chart above (click to zoom) shows scoring for Cruiser class cars arriving at Adelaide, in a modified version of my “tuning fork” style. The score is calculated as a product S = D × H × (1 / E) × 0.99l. The chart shows the components of the score on a logarithmic scale, so that multiplying and dividing score components corresponds to adding and subtracting bars. For each team, there are 6 bars (the 6th bar, in a darker colour, is the total score):

  1. The distance travelled in km (D). Teams completing the entire course score ahead of others.
  2. The weighted average number of humans (H) in the car (so that the product D×H is the number of person-kilometres). A small tick mark above the bar shows the number of seats in the car, which is the maximum possible value of H for that team.
  3. The nominal external energy usage (E) in kWh (initial battery capacity, plus metered charging along the way). This bar is negative, because we are dividing by E.
  4. The fourth place, labelled P, is reserved for the incorporation of practicality in the final score.
  5. The lateness factor (0.99l), where l is the number of minutes of late arrival, plus the number of demerit points.
  6. The total score (S). The score itself is shown over the bar. It can be seen by inspection that this bar is the sum of the others.

Well done, Eindhoven!

Update 1: I note that Sunswift’s car has been modified to have 2 seats, rather than 4.

Update 2: See here for an updated chart.

My Personal WSC Gem Awards Part 1

The faster than lightning gem goes to team 8 (Agoria, formerly Punch). They built a fantastic car, and drove it at the maximum safe speed, giving them a well-deserved win. Congratulations!

The best new team gem goes to team 6 (Top Dutch). They did everything well: fund-raising, media, construction (the build quality of the car is superb), logistics, testing, and racing. A well-deserved fourth place! Other new teams would be well-advised to emulate the approach taken by this team.

The most beautiful car gem goes to team 21 (Twente) for their tiny little car. It took a lot of clever engineering to make a car that small! The aero drag on the car is, I understand, around the same force as the weight of a large (1.5 l) bottle of water. Sadly, a wind gust overturned the car during the race, but here again the car perfectly fulfilled its task of keeping the driver safe. A wonderful car!

The consistency gem goes to team 92 (ETS Quebec / Éclipse). While cars elsewhere were crashing and catching fire, they continued to drive at a very consistent speed (lowest standard deviation of the ten leg speeds – see the pink line in the graph). They finished as best Canadian team, second North American team, and ninth in the world. Well done!

World Solar Challenge race chart 4

Another race chart (I’m using the same baseline speed I used in 2017). The right vertical axis shows arrival time at “end of timing” in Darwin time (Adelaide time is an hour later).

After repairs, Kogakuin and Aachen have reached Adelaide, followed by Antakari, Nagoya, Eclipse, and Jönköping University. Blue Sky are in Adelaide, but do not seem to have crossed the ceremonial finish line yet.