How many MPH do you drop when going against headwind???

[SnappyPix]

The force that acts against you riding into the wind is proportional to the square of the relative wind velocity. If you are going into a 10 mph wind at 10 mph, the force is K*(10+10)^2 = 400 * K. If you are going 20 mph into a 10 mph wind, the force is K * (10+20) ^ 2 = 900 * K

The multiplier K depends on your frontal area and how aerodynamic you and your bike are, and the viscosity of the fluid you are moving through. It's harder to bike through water.

I THOUGHT it must be something like that!!!

All you need to know is that the wind is never with you, it's either against you, no wind at all, or you're just having a really good day!
And even if it's against you, stone me if it doesn't change direction, so it's there again on your way back!

[mimitabby]

And even if it's against you, stone me if it doesn't change direction, so it's there again on your way back!

i thought that was a Seattle weather condition. It happens in New Zealand too?