[TowerTalk] Opposing boom to mast plates?

[Gene Smar]

I believe the problem that's looking for a solution here is balancing the twisting torque imparted on the rotator, not bending moment exerted on the mast. Mounting hf Yagis on opposite or alternating sides of the mast will reduce the twisting torque versus having them on the same side.
73 de Gene Smar AD3F 

Sent from my Radio Shack TRS-80 model 100 laptop 
 
  On Sun, Sep 17, 2023 at 8:33 PM, Stan Stockton<wa5rtg at gmail.com> wrote:   Seems to me if you really believe mounting antennas on opposite sides of the mast is going to make a difference in whether the mast bends you already have a problem regardless of how you mount the antennas. I would think mounting the top antenna just a few inches lower would make more difference.

73…Stan, K5GO

> On Sep 17, 2023, at 7:22 PM, Chuck Dietz <w5prchuck at gmail.com> wrote:
> 
> Well my masts are very heavy. Weight of the antennas is not a real factor.
> And saying someone is not an engineer doesn’t help either.
> I believe It is a fact that the wind forces on Yagi antennas pointing in
> the same direction are transmitted to the mast in the exact same manner
> regardless of which side of the mast they are clamped to. It is a fallacy
> to think that they would exert force in the opposite directions and cancel.
> 
> Chuck W5PR
> 
> On Sun, Sep 17, 2023 at 4:03 PM <k7lxc at aol.com> wrote:
> 
>>> They were minimizing eccentric loads off the vertical centerline by
>> putting one on either side. It won't do anything for reducing turning
>> torque or wind loading, of course.
>> 
>>    Looks like you're not a Professional Engineer.
>> 
>> Cheers,
>> Steve      K7LXC
>> TOWER TECH
>> 
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