Originally Posted by
waterrockets
Unfortunately, the wind did start up, and the first couple coast-downs were clearly invalid.
So, rather than waste the ride, we decided to head to a more flat course and try something new: One of us would ride in a repeatable static position (locked straight elbows, in the drops) and target 350W. The other, who was testing positions, would match speed from about six feet off to the side. Then we would compare power.
I've never tried this because it requires two people and two power meters but I've heard of people doing this. In theory it's a good way to control for wind and terrain though since I've never seen the data produced by these kinds of runs I can't say for sure. But it was a good idea to try.