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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