British Cycling Gets Slippery Fast With Ducts And Chevrons?

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Recently published patent-applications have alluded to some surprising experimentation with aerodynamics on the part of Great Britain’s “Secret Squirrel Club.” With Rio looming on the Olympic horizon, British Cycling and UK Cycle Sports continue to stretch for gold. Get your fill of fast-and-slippery technology after the break…

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Our friends over at Road.cc have discovered these unorthodox aero designs filed by UK Sport on behalf of the English Institute of Sport. The application reportedly states the “flow of air from the rear of the helmet significantly improves the airflow patterns down the back of the rider, thus reducing drag.” There is also mention of a battery powered impeller that would be located within the ductwork to “assist the air flow through ducts.” The UCI’s potential response to this technology will be a matter of debate.

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Image: Boeing

Laminar flow is the uninhibited passing of a fluid over a body resulting in no turbulence of said fluid. This is the core principle of much aero technology, both on and off the bike. Boeing is making fuel-efficient strides in utilizing a perforated tail on their new 777X, and this is speculated to be the same principle used by British Cycling in their ducted helmet.

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The “how” is not fully understood, but one aspect of the perforation/exhaust-outlet technology is: by “ingesting the turbulent layer of air through the [perforations/vents], the overall drag over the [affected body] is reduced.” (Wired, Nov 2013) This is seen, theoretically, in both the 777X and the ducted helmet.

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With a cyclist’s body being the greatest contributor to drag, the skinsuit is consistently the subject of much aerodynamic attention. The second half of these patent applications employ unique “kicks” in the form of chevrons that are positioned on the cyclist’s arms’ trailing-edge. These chevrons are either plastic pieces attached to the skinsuit, post-production, or by heat-moulding of the suit itself.

raised chevrons

Quoted in the Telegraph, inventor/engineer Robert Lewis of aerodynamics consultancy TotalSim, which works with UK Sport, stated, “It has been found that in cycling, air to the rear of an arm or leg flows upwards along the arm or leg and is a significant cause of overall drag on the cyclist…By including an air flow disruption device on the rear of the arm or leg, this flow is broken up, reducing the overall drag.” Whether these technologies, still in development stages, see production or competition (or even Olympic gold) remains to be seen. But the British Cycling Team still has some time before their flight leaves for Rio.

Comments

chuckfinn - 11/25/13 - 11:18am

But really we dont want our professional riders looking like frog men in space. :)

Alex Kio - 11/25/13 - 12:18pm

@chuckfinn But really we want our national riders representing not only our countries’ athletes and athletic programs, but also our superior engineering resources on the world stage and winning titles.

Just for the record I’m not British and don’t care about nationalism or the Olympics. Just trying to figure out why this wonderful site has so many gosh darn haters.

AlanM - 11/25/13 - 12:57pm

“There is also mention of a battery powered impeller that would be located within the ductwork to ‘assist the air flow through ducts.’”

Hey, don’t mind the jetpack I’m sporting, it’s just to improve airflow.

LD - 11/25/13 - 3:59pm

there are no better aerodynamicists than the Brits (I am not one). At the pinnacle of aerodynamics….. Formula One, every designer is British….. even on non British teams. We may even see a connection between rider and bike reusing air flow one day. Mercedes created a very controversial rear wing that was able to redirect airflow back to the front of the car for an advantage. What is impossible to imagine now is probable tomorrow.

greg - 11/26/13 - 12:06am

im gonna put a small fan for cooling airflow in my helmet. it’s gonna be powered by a small kerosene turbine, creating wind speeds of a little over 300mph. but it’s not a propulsion device, it’s for cooling.

butt - 11/26/13 - 12:08am

1) Banned by the UCI for making bicycling faster.
2) It took them this long to figure out such basic concepts in aerodynamics?

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