Originally Posted by
shasta
If there is an equation its going to have to factor in how wide you are, what your wearing, etc. It would be cool to know though. I'm going to throw out a guess and say that every mile an hour of headwind equals 1 percent more effort.
1% would be an unrealistically low estimate.
http://www.exploratorium.edu/cycling/aerodynamics1.html
Yes, it's not a comprehensive calculator. But its good enough to make a point.
15mph cycling into a 0mph headwind = 94w
15mph cycling into a 1mph headiwnd = 108w
15mph cycling into a 2mph headiwnd = 125w
15mph cycling into a 3mph headiwnd = 142w
Looks non-linear to me.