## PSN-L Email List Message

Subject: RE: Pendulum in a fluid?
From: "Paul Cianciolo" Paulc@........
Date: Mon, 18 Aug 2008 16:22:54 -0400

```I think this would lower the "Q" to a very low value, but not increase the
period significantly.
One newbies opinion

PauLC
W1VLF
http://www.rescueelectronics.com/
-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@.................
Behalf Of tchannel1@............
Sent: Monday, August 18, 2008 1:44 PM
To: psn
Subject: Pendulum in a fluid?

Hi All,   Just a thought...Has anyone explored a simple 36"? pendulum, say
having a 2? second period, then containing the pendulum in a fluid.  The
pendulum still should move from side to side, but with a longer period?    I
have no idea, how to do this, or what the result would be.

I think the result would be similar to an "oil damper"....but an oil
damper does not change the period, does it?

To ask it in a  different way......Picture the 36" vertical pendulum
swinging in a large tube filled with air,  Now the same pendulum, but with
the tube filled with water.
Would this change the resulting period?

Thanks, Ted

I =
think this=20
would lower the "Q" to a very low value, but not increase the period=20
significantly.
One =
newbies=20
opinion

PauLC
W1VLF
http://www.rescueelectronics.c=
om/

-----Original Message-----From: =
psn-l-request@.................
[mailto:psn-l-request@...............On Behalf Of=20
tchannel1@............Sent: Monday, August 18, 2008 =
1:44=20
PMTo: psnSubject: Pendulum in a=20
fluid?
Hi All,   Just a =
thought...Has anyone=20
explored a simple 36"? pendulum, say having a 2? second period, then=20
containing the pendulum in a fluid.  The pendulum still should =
move from=20
side to side, but with a longer period?    I have no =
idea, how=20
to do this, or what the result would be.

I think the result would be =
similar to an=20
"oil damper"....but an oil damper does not change the period, does=20
it?

To ask it in a  different=20
way......Picture the 36" vertical pendulum swinging in a large tube =
filled=20
with air,  Now the same pendulum, but with the tube filled with=20
water.
Would this change the resulting=20
period?

Thanks, =
Ted
```