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0.27 was estimated from a TT using Aerolab. Cervelo P2, disc, PX 50mm, giro advantage, skinsuit, overshoes... Obvious inaccuracies include traffic (although it was a quiet race) and the fact speed was recorded via the GPS and not a wheel magnet. Hence my intention to do some proper field testing this year. If I can get down to 0.22 by September with a position I can sustain for an IM then I'll be overjoyed. :-)
Looking at photos I actually think that my position was worse in 2014 than in 2013 and previously. Previously I usually wore a pair of Oakleys for races, whereas photos seem to reveal that for most of 2014 I unintentionally wore my regular specs. Obviosly the Oakleys covered a wider area of my vision and I think that this means that I had to hold my head much higher in order to see through the lenses on my normal specs, as opposed to keeping my head down and peeping our of the very top of the oakleys. Will try to arrange a visor for next season and will make an effort to race without glasses since I can still see fine and I don't get on with contacts.
Anyone should be able to get 0.25 without too much difficulty, as long as you've got an aero helmet/skinsuit etc.
I was stuck at 0.250m^2 for a while back in 2008, you really do have to keep plugging away at it and it'll reap dividends. I'm down to ~0.191m^2 now.