The wind-averaged aerodynamic drag of competitive time trial cycling helmets | Zendy

Len Brownlie | Zendy; Peter Ostafichuk | Zendy; Erik Tews | Zendy; Hil Muller | Zendy; E. M. Briggs | Zendy; K. Franks | Zendy

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The wind-averaged aerodynamic drag of competitive time trial cycling helmets

Author(s) -

Len Brownlie,

Peter Ostafichuk,

Erik Tews,

Hil Muller,

E. M. Briggs,

K. Franks

Publication year - 2010

Publication title -

procedia engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.32

H-Index - 74

ISSN - 1877-7058

DOI - 10.1016/j.proeng.2010.04.009

Subject(s) - wind tunnel , drag , aerodynamics , lift to drag ratio , euler angles , lift (data mining) , aerodynamic drag , wind speed , cycling , marine engineering , aerospace engineering , engineering , environmental science , structural engineering , simulation , meteorology , physics , computer science , geography , archaeology , quantum mechanics , data mining

This paper documents a wind tunnel test program that measured the aerodynamic drag (Fd), lift (Fl) and side force (Fs) of 12 contemporary time trial (TT) helmets at yaw angles of 0 to 15∘. Fd measurements at yaw were subjected to a novel analysis technique adapted from the automotive fuel efficiency literature to provide a single wind averaged drag (F̄d) at a velocity (v) of 14.75 m sec−1 (53 km/h). Ranked wind averaged Fd measurements of TT helmets provide a simple performance index and it is recommended that this analytical procedure be adopted by the bike industry to permit uniform Fd comparisons of helmets, wheels, frames and other components that are subjected to yaw angle wind tunnel tests

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