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The corresponding errors in the wind tunnel are under 1%. They were lucky to have near ideal conditions for the outdoor tests, which kept the measurement errors down to around 2% of total power. They compared wind tunnel data with track testing at the Lowe's Speedway and the Asheville velodrome, which consisted of several 10 mile and 1km time trials at a constant speed of 40km/h.

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In late July, Cote and his team did a series of tests comparing a standard road bike (Specialized Tarmac SL2 with HED Bastogne wheels) to a full time trial bike (Specialized Transition with HED3 Trispoke wheels and a Specialized TT3 aero helmet). Even if you have a smooth flat track and precise measuring equipment, like the SRM cranks and mobile weather station that we had, too much wind will give you large errors, even greater than what you are trying to measure. That said, it's time consuming and you still need to control as many variables as possible. Testing outdoors is useful because it's closer to real world conditions. The downside of doing this in a tunnel is that you can't account for handling in a crosswind, because the bike is fixed to a set of rollers. You also need to test over a range of yaw angles (wind direction relative to the rider's direction) to account for crosswinds, because aerodynamics are significantly affected by wind direction. You can test the bike alone, but it makes more sense to have someone on it, because the overall shape will be completely different. For best results, you need the rider on the bike to be able to hold their position stable while pedalling. Wind tunnel measurement is currently considered the gold standard of bicycle aerodynamic testing. But his experience as a wind tunnel subject, time trialist and of course his availability makes him an ideal test rider. He's coming off a 15 month ban (expired November 12, 2008) after testing positive for the appetite suppressant Phentermine, which bizarrely is legal out of competition but illegal in competition.

How to unsubscribe from emails from aero pro#

Plus they can compare wind tunnel data to on road data by using the nearby Lowe's Motor Speedway, a 2.3km banked NASCAR oval.įor the test, Mark enlisted the help of Nathan O'Neill, eight time Australian time trial champion who has raced for European and US pro teams for the past eight years. It's one of the cheapest in the US at $390 per hour (compared to $800/hr for the San Diego tunnel) and the tunnel managers Mike Giraud and Dave Salazar know exactly what they're doing when it comes to bikes. The A2 Wind Tunnel, the smaller brother to the AeroDYN tunnel, is used to test small vehicles and bicycles. It's NASCAR heartland here, and they put a lot of money into aerodynamic testing facilities. We were given the opportunity to spend a day with Specialized's young aerodynamicist Mark Cote at the A2 Wind Tunnel and Lowe's Motor Speedway in North Carolina. Luckily there are people called engineers in the cycling world whose job it is to find the answers to these questions. You need to know what you're doing, and most of us don't.

The answer is quantifiable but finding it is another matter.