Re: Technical: heels on foot plate?


KC wrote:
Paul,

Also, consider your own example of the kayaker lunging for the finish
with his boat. He throws the lightweight part of the system (the boat)
forward by throwing the heavy part of the system (his torso) sternward,
resulting in a surge of the hull toward the finish line.

Exactly! and the system has deccelerated more rapidly than at any other
time during the event, this is why it can only be used for this single
"lunge". Otherwise, the system just has to be reaccelerated from the
lower speed, something we like to avoid while in the middle 1995m.
[;o)

The rowing example I illustrated to Mike is exactly the same... throw
the body to stern, the bow lunges forward, then creep back toward bow,
without overcoming hull/water friction, and you'll be able to inch your
way sternward.

Now you have it!
Fast Recovery = Throwing body to the stern
Slow Drive = Creep back toward the bow
Then you will "Inch your way sternward". (The opposite direction in
which the boat was drawn rapidly!)

Either you just confused yourself, or changed your position to agree
with what I had already said. Which is it?

I just went and tried this in a rolling chair on a hard floor. I
couldn't spin in circles (chair was too cumbersome) but I could inch
forward: I lurched the chair and my feet forward, by throwing my torso
backward. Then I slowly moved my torso forward again, so as not to
overcome the friction of the wheels on the ground, then repeated... I
inched along in forward progression, with technique opposite to your claims.

-Kieran

No, bad example, since the chair wheel friction is not variable enough.
Similar to a C2 being on Slides having differences as compared to a
boat on water (the C2 gains velocity during the recovery, as it reacts
against the bodies gathering mass), and explains why the C2 on slides
should allow us to find a well defined COM that does not move relative
to the ground while rowing. That is, if the rower is controlling their
momentum well.

- Paul Smith

.

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