5 Sep
2011
5 Sep
'11
12:37 a.m.
Agreed, but if you tell a new dancer to pull in, you might wind up with
him glued to your chest, making no counterbalance possible at all. We
began by talking about how we are going to try to convey this wonderful
sensation to new dancers. I still haven't heard something really pithy
and direct that will give them the sensation they need to understand. I
did try the gallop with an allemande last night to fairly good effect.
I am going to keep working on this point.
Andrea
On 9/4/2011 6:49 PM, barb kirchner wrote:
lol. thank you, jeff. i'm sure that's
exactly how i meant to explain it!!
but actually, you make a great point. when i think of the most satisfying swings
i've had, centrifugal force is a GREAT part of it. that's why leaning back
doesn't make sense - you should pull in. centrifugal force pulls you back - no need
to do it yourself. in fact, i think that counteracting centrifugal force by pulling in is
what makes the most satisfying swings seem totally effortless. balance IS the key.
barb
Date: Sun, 4 Sep 2011 18:35:23 -0400
From: jeff(a)alum.swarthmore.edu
To: callers(a)sharedweight.net
Subject: Re: [Callers] Re Swinging
John Sweeney wrote:
I think you must be talking about much slower swings than I'm talking
about. Let's say we have two 130 pound people who swing 3.5 times
around in a balance and swing. Physics geekery [1] says it takes
fourty pounds of force to hold the two of them together. I'd much
rather have that split over two people.
Jeff
[1] Let's approximate the dancers as point masses of 130 pounds nine
inches apart. There are 12 counts of swinging after the balance,
so about six seconds. Rotating 3.5 times in six seconds means 35
times in sixty seconds, or 35 rpm. Force here is M*w*w*r, where
M is 130 pounds, w is 35rpm, and r is 4.5 inches. This gives
20lbf for each dancer, or 40lbf total.
_______________________________________________
Callers mailing list
Callers(a)sharedweight.net
http://www.sharedweight.net/mailman/listinfo/callers
_______________________________________________
Callers mailing list
Callers(a)sharedweight.net
http://www.sharedweight.net/mailman/listinfo/callers
If the
lady additionally has their left hand on the back of the
the gent's right shoulder, then the lady is doing more of the
holding together and the gent can do less.
Centrifugal force is not that great -
if you are in balance the
pressure is tiny.