Re: [TowerTalk] KT34XA Torque Balance

[Red <RedHaines@centurytel.net>]

Hi, Tod and TTers;

Tod presents 'an elegant solution."  Furthermore, by optimizing the 
length and diameter of the arm versus area of the vane, one can minimize 
the wind loading on the tower and mast.

I recall that this aspect of antenna design and the calculations are 
addressed in David Leeson's book, "Physical Design of Yagi Antennas."   
I don't believe he includes calculations for any of the KT34 series, as 
he does for several popular antennas, but he offers all you need to 
calculate the wind induced torque.

73 de WOØW

Tod - Minnesota wrote:

> Mike:
>
> My plan is to install a 'wind sail' slightly above the
> antenna boom.  This will be a single rectangular piece of
> metal (probably aluminum; maybe galvanized sheet metal)
> mounted on an arm that extends out from the mast. The arm
> will be fastened to the mast using a clamp that allows the
> length of the arm from mast to sheet metal to be varied.
> This way I will be able to adjust the angle of the sheet
> metal 'wind sail' relative to the antenna boom and also the
> moment arm length. 
>  
>
>
> Michael Tope
>  
>
> > > Sent: Friday, January 07, 2005 2:06 AM
> > > To: TowerTalk
> > > Subject: [TowerTalk] KT34XA Torque Balance
> > >
> > > Has anyone on the list attempted to wind torque balance a
> >    
> KLM
>
> > > KT34XA? I just went thru the numbers and my calculations
> >    
> show
>
> > > that the KT34XA should be a great weather vane. The
> >    
> factory
>
> > > specs show that the boom-to-mast connection is about 20" 
> > > inches behind the physical center of the boom. Presumeably
> >    
> >
> > > this is done to compensate for the fact that most of
> >    
> weight
>
> > > from the elements is concentrated towards the back-end of
> >    
> the > antenna boom.
>
>
>  
_______________________________________________

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