You aren't missing anything. You are exactly correct ... it doesn't
matter. It's simple physics.
Dave AB7E
On 12/11/2017 7:34 PM, Gary Schafer wrote:
I have from time to time seen it professed that mounting two antennas on
opposite sides of the mast will equalize the torque supplied by wind.
The only thing mounting on opposite sides of the mast will do is equalize
GRAVITY forces on the mast (that try to bend it over) which will be rather
small differences given only a few inches distance apart.
Torque is rotational. Both antennas are going to exert the same amount of
torque no matter which side of the mast they are on.
What am I missing here?
73
Gary K4FMX
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Jim Thomson
Sent: Monday, December 11, 2017 6:38 PM
To: towertalk@contesting.com
Subject: [TowerTalk] PST61 Rotor Reliability?
Date: Mon, 11 Dec 2017 00:46:45 -0700
From: David Gilbert <xdavid@cis-broadband.com>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] PST61 Rotor Reliability?
<I don't think you read my post.?? A paddle isn't applicable here at
<all.? In fact, it would make things worse by adding cross sectional
area
<to the system.
<Dave AB7E
### Are your pair of optibeam yagis even Torque balanced to begin with,
probably not, since I dont see any form of tq comp used on any
commercially made yagi.
If not,your swirling winds will make your situation even worse.
That paddle the fellow was talking about is actually called a torque
compensator.
If you dont have an equal amount of boom on either side of the mast, it
will not be
tq balanced. If you have more boom on one side of the mast than the
other side,
it has been mounted at the center of gravity. If you do that, you
require a small tq comp plate
down at the shorter end of the boom.
## method 2 is to mount the boom to mast... dead center in the middle of
the boom. Then
use a small counter weight at the light end of the boom. Ditto with
both yagis.
## with 2 yagis on a mast, they need to be mounted on opposite sides of
the mast.
## do all of the above, and most of your issues will be alleviated.
## I thought that prosistel made bigger rotors like the 71 and the
110 / 115 ??
## My SMALL k7nv PP is good for 1250 ft lbs of tq, thats 15,000 inch
lbs of rotating tq.
Its lighter than my M2 OR-2800. OR-2800 only has 233 ft lbs of tq =
2800 inch lbs.
### on a PP, the final big gear is meshed,and driven by 3 smaller
gears, every 120 degs.
PP also come in the medium and large size.
## are u saying your swirling winds are essentially blowing in 2
directions at once, like N at
one end of boom, and S at other end of boom ?? With the boom oriented
E-W. If that's the
case, you have a real serious problem. And any TQ imbalance will make
it even worse, a lot worse.
Jim VE7RF
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