[TowerTalk] PST61 Rotor Reliability?

[David Gilbert]

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 at contesting.com] On Behalf Of
>> Jim Thomson
>> Sent: Monday, December 11, 2017 6:38 PM
>> To: towertalk at contesting.com
>> Subject: [TowerTalk] PST61 Rotor Reliability?
>>
>> Date: Mon, 11 Dec 2017 00:46:45 -0700
>> From: David Gilbert <xdavid at cis-broadband.com>
>> To: towertalk at 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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