4% slower than 2:00:25 Is 2:05:13

Hicham le Rouge wrote:

...as high as 6%...

DAM. 'Nuff said.

Nikolai wrote:

Overcoming air resistance, which hasn't been changed with the shoes.

Oh is that crazy tear drop shape just for decoration??

mileage_man wrote:

calculo wrote:

posters need to acquaint themselves with physics

4% more efficient means 4% better energy return

the conversion to speed improvement is using drag equation which is speed^3

-> speed increase is :

1.04 ^ ( 1/3 )

=

1.0132

for a 2"00'25, the conversion is :

2"02'00

First, isn't it true that drag is proportional to v^2 at running speeds, not v^3?

only in a vacuum with no air resistance

in the real world, air resistance is the deciding factor & drag is the relevant concept, which requires another "v" factor to be multiplied to "v^2" -> "v^3"

Second, drag isn't the only, or even primary, limiting factor in running performance, so this is not a valid conversion technique.

no

if you understand physics, drag is the limiting factor of any motion thru a fluid

it is the factor which determines maximum constant speed

As

YEAH BUDDY wrote:

thefastestone wrote:

That is all correct.

But 4% more than 100, is not the same as a reduction of 4% equaling 100. Which is what your original thesis posited.

I think my original thesis was that 4% slower than 2:00:25 is 2:05:13. In fact, I'm sure of it.

As evidence for your conclusion (thesis) that 2:00:25 is the 4 percent reduced speed, presumably.

But yes, if that was not your thesis, then this was just an irrelevant musing with no relation to the actual Nike Sub 2. Forgive me for presuming what you actually did mean.

thefastestone wrote:

As

YEAH BUDDY wrote:

I think my original thesis was that 4% slower than 2:00:25 is 2:05:13. In fact, I'm sure of it.

As evidence for your conclusion (thesis) that 2:00:25 is the 4 percent reduced speed, presumably.

But yes, if that was not your thesis, then this was just an irrelevant musing with no relation to the actual Nike Sub 2. Forgive me for presuming what you actually did mean.

It's okay, next time just try to read what's actually written

That's rubbish if you think his effort was equivalent to a 2:05 without the shoes. Desisa and Tadese did nothing spectacular. I don't think the shoes really made any difference. Kipchoge is just the GOAT.