A Belgian solar car climbs the mountains of Chile

Punch at CSA 2018 (picture credit)

Well, Punch Powertrain Solar Team, from Belgium (above) is currently racing against just one other Challenger car in the Carrera Solar Atacama in Chile (see: and the live tracker). I thought it would be interesting to compare Punch’s performance against that other mountain race, the 2018 American Solar Challenge, won by Western Sydney University.

The two races can’t be compared directly, however. The Carrera Solar Atacama has a greater elevation range (sea level to 3415 m, compared to 296 m to 2585 m for this year’s ASC). The CSA is south–north, rather than east–west, and takes place around 20° closer to the equator, on average. More dramatically, however, this year’s ASC allowed 2 m2 supplementary solar panels during static charging (see image below). This made the ASC a faster race.

WSU using supplementary solar panels at ASC 2018 (picture credit)

What I have done instead is compare the average speed for each segment against the approximate average climb rate, using the information provided in Punch’s wonderful infographics (see their social media: ). The corresponding datapoints for WSU were calculated in exactly the same way, and linear regression was applied for each team (see lines on the chart at the bottom of this post). The flatter line for Punch shows that they were less affected by the steep climbs. This is presumably due to their fancy new motor, which has a half-speed/double-torque mode. This Mitsuba motor was built by Nomura Co to Punch’s requirements.

Punch’s motor, built by Nomura Co (picture credit)

Update: the chart below has been updated with new data.