The 30th Icicle Ride

On Saturday I went to see one of the few films I was really interested in watching at MIFF (Melbourne International Film Festival), called 'The City of Life and Death'. It's a film about the Nanjing (Nanking) massacre; it was a big regret of mine that when I was in Nanjing a couple of years ago the museum dedicated to the massacre was closed for renovations. The film was a huge critical and commercial success in China, and the organizers correctly predicted a big turnout, putting it in the largest capacity screen available. It's great that so many people in Melbourne turned up to watch a subtitled film. As with Speilburg's 'Shindler's List' and Haneke's 'The White Ribbon', it was shot in black and white. It didn't disappoint, containing some of the most startling scenes I've ever seen on film. There wasn't much character development, but it didn't need it, instead going for a more overarching view in order to capture the unimaginable scale of events.

Normally I would have returned back home to sleep, but instead I turned up at midnight at the petrol station near the Calder raceway, meeting 150 or so other bikes for the icicle ride. This is a group ride run overnight in the middle of winter which is well-known in Victoria and has been running annually for 30 years. The ride is run over three legs of about 120 kilometers each, finishing this year in Healsville at about 6 or 7 in the morning. I wouldn't call it a fun ride but it was certainly challenging, with temperatures dropping to zero in some places. Getting my commemorative badge upon finishing brought a sense of achievement: I can now say that I have completed an icicle ride. There was a lot of wildlife about, with two riders colliding with kangaroos and one other with a wombat. It emphasized to me one of the key dangers of riding at night in Australia.

Doing the icicle ride got me looking into issues concerning wind chill when riding. The National Weather Service in the USA use an equation to model the effective (i.e. wind chill included) temperature based on the air temperature and the wind speed. I've plotted it below using degrees Celsius for the temperatures and kilometers per hour for the speed. The equation is only valid for wind speeds of 10 kph and above, and for air temperatures below ten degrees.

The three lines represent different air temperatures: 5 degrees (sold line), 2.5 degrees (dashed line) and 0 degrees (dotted line). At these sort of temperatures a good rule of thumb is that the wind chill factor when riding is about ten degrees. The non-linearity in the curves is to be expected. Perhaps of more interest is the fact that differences in the air temperature become larger once the wind is taken into account. No wonder I was so cold.



Technical Note: The equation plotted is W = 13.13 + 0.6215T - 11.36V + 0.3962TV where T is air temperature (degrees Celsius) and where V is speed (in kilometers per hour) to the power of 0.16.

Riding Distance: 405 kms