[TowerTalk] Calculating Turning Radius when using Rings or IIX RM-16

[Grant Saviers]

What does this mean?    "-3 feet or less"

Consider that elements and booms move UP with some wind conditions. So 
it depends on the guy angles what you might choose for clearance.   Also 
ice loading on guys.   Your tower bends with wind load, so 1 or 2 guys 
slack a bit depending on the wind direction.  1 foot sounds too tight to 
me (in any direction).

If you have the ring rotator, then the diameter is known,  what is the 
question?

I designed swing arms with axis of rotation at 5" from the od of the 
tower leg and 38" long arms to get max swing on R65.  The best azimuth 
coverage (where the DX is at) for my QTH is when the boom is not 
perpendicular to the arm.  If your tower is up then you are stuck with 3 
mounting points unless azimuth coverage isn't important.   Is that in 
your calcs?  Then I decided to go with rings, but would probably go with 
swing arms if a do-over.

If guywire is EHS, then there is a big different problem, IMO.

Grant KZ1W

On 8/11/2016 10:56 AM, n1rr at comcast.net wrote:
> I am calculating the turning radius that is lost when using two sidemount methods I have on-hand.
> IIX RM-16 & Ringrotor
>
> Turning radius of tower is: From the vertical leg (some distance below the guy attachment point) to guy wire.
> Turning radius of antenna is farthest tip to: to centerline of attachment mast (for IIX)
> or CG point on boom.(on a Ring) >> NB: This may be a director tip on larger yagis.
> Turning radius is NOT calculated from the centerline of the tower section.
> These distances include sag of guy wire and one foot spacing from guywire.
>
> Ringrotors (-3 feet or less)
> This varies based on size or ring used and size of tower (Gap between vertical leg and ring)
>
> IIX RM-16's (-4.5 feet or less)
>
> Are these distances accurate or too conservative ?
> Is one foot away from the farthest antenna tip (reflector) to guywire enough spacing ?
> -Charlie N1RR
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