jeepers wrote:
Drafting, by definition, is "running in the aerodynamic shadow." Saying that someone gets the equivalent of a 15mph tailwind by drafting is exactly the same as saying that running in the "aerodynamic shadow" gives "energy savings" of up to 15mph.
Wrong. First, you and "old tymer" both overlooked the significance of the words "up to." I didn't say that drafting (or running in the aerodynamic shadow of some object) at 4-minute pace is the equivalent of a 15-mph tailwind. If you're a tall runner drafting off a short, skinny runner who is two meters ahead of you, the energy savings is significantly different from (for example) Geb's drafting off of two or three tall runners just ahead of him in his vaious marathon time trials, or Geb's drafting off of a motor vehicle in his 10K time trial. (Even more blatant drafting arrangements have been used in cycling, where a vehicle specifically designed as a windblock has been used by cyclists seeking to break speed records.)
Second, in addition to saying "up to," I also said "approximately," because drafting on a quarter-mile oval track doesn't have the same effect as drafting on a straight course, and also because air molecules are not simply parted by a windbreak, but rather curl around the windbreak to create a variety of air movements that can either increase or decrease the energy savings, depending upon the shape of the windbreak and the precise location of the following runner.
My statement was, I believe, precise and correct. More important, of course, is the more general point that drafting off of other runners can provide a significant energy advantage that is equivalent to a manipulation of the course conditions to provide a constant tailwind or a downhill slope from start to finish, so permitting a "paced" run to count as a record without permitting a wind-aided or downhill run to count as a record is an artificial distinction of convenience, not a reflection of some objective and universal standard of "legitimacy."