
"under their own steam"
I thought they were supposed to be solar powered?
Sorry :-(
The provisional* results of the World Solar Challenge show that just seven of the 37 solar cars competing drove the entire 2,998 kilometres from Darwin to Adelaide under their own steam and by Saturday's deadline. Michigan celebrate in Adelaide. Pic: World Solar Challenge The top three finishers Tokai University, Nuon Solar …
Not sure about 2011, but in the early WSC races there was no rule about using solar electric (photovoltaic) power - any solar power could be used, including Stirling engine or steam engine/turbine (with steam generated by solar power, of course).
In fact, I am pretty sure at least one team used a Stirling engine in the early 90s. It's efficiency was obviously no match for the then emerging GaAs PV cells...
Need to find my "Speed of Light: The 1996 World Solar Challenge" book and check this.
Yes, yes, I know I'm a (WSC) geek, no need to remind me :-)