Originally Posted by
noglider
The lesson here (for you, anyway) is that your position makes the most difference, not the value of the equipment. Are you, by chance, thin? I'm a thin person, and headwinds affect me a lot, and hills don't. A heavy friend has the opposite observation. I think it's the surface-area-to-mass ratio.
You just invented "sectional density," which has units of pressure, similar to wing loading for aircraft. It's related to "ballistic coefficient" which has an additional fudge factor for the projectile shape. Mathematically it's a little strange and has a messy history because it needed to be made into lookup tables for artillery use before computers
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."