Jeremy McCreary
Bought it anyway
- Region
- USA
- City
- Carlsbad, CA
Air drag is proportional to the square of the airspeed, so if you're traveling twice as fast (whether you're actually going twice as fast or you're going, say, 10 mph into a 10 mph headwind) it's four times the air drag.
True, and the mechanical power needed to overcome air drag (a force) at speed V through still air is proportional to V³. So doubling V increases the aerodynamic power loss by a factor of 8!
In assisted pedaling, the power lost to total (aerodynamic+rolling+slope) resistance is ultimately what drains your battery and drives perceived exertion. So that V³ is a fact of life that can't be ignored.
The aerodynamic power loss is also proportional to drag area CdA. This is the factor you reduce with more aero posture and clothing. Cutting CdA by 20% (quite doable) cuts aerodynamic power loss by 20% at all speeds. That's no small thing.
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