Four time World Solar Challenge winners unveil - Nuna 7

The team that won the World Solar Challenge four times consecutively between 2001 and 2007 have unveiled their latest solar racer.

The Nuna7 solar-powered vehicle – which features pioneering pore-filling technology – will take part in the competition in Australia in October, representing the fourth time that the Nuon Solar Team from the Technical University in Delft and Sikkens paint experts from the company's Automotive and Aerospace Coatings business have worked together.

This year, however, will be the first time that the Nuna has used the new composite pinhole filler Aerowave 2501, which has already been used on commercial aircraft.

"When the carbon fiber shell of the Nuna is manufactured, the process creates pinholes that must be filled with putty and then sanded, often multiple times," explained John Grevers, AkzoNobel's Technical Coordinator for Benelux and Sikkens project leader for the Nuna.

"Our water-based pinhole filler replaces much of the putty and doesn't require sanding, because it can be easily wiped away. Which means it also adds less weight to the car than traditional fillers."

As well as the new pinhole filler, the Nuna 7 also features an aerodynamically advanced Sikkens coatings system designed to reduce wind drag and cut down on preparation time. Products used include Colorbuild Plus, Autocryl Plus LV, and Autoclear LV Superior.

"AkzoNobel is helping us a lot in terms of making sure that we have the best possible aerodynamics thanks to the finish they provide," said Leslie Nooteboom, the Delft team's Public Relations manager. "We feel that the company is playing a very important role in our chances of winning the race in Australia."

Added Grevers: "It has been a valuable experience for us to develop coatings that not only provide advanced aerodynamics, but can also perform well under the extreme temperatures of solar car racing. And it’s always good to work with students because they bring a fresh vision."

The team hopes to go one better than 2011, when the Nuna 6 finished second in the 11th World Solar Challenge. The biennial event – which aims to promote research on solar-powered cars – attracts teams from across the globe. The 2013 race will be staged from October 6 to 13.