On 8/29/2021 1:24 AM, Bruce Beck wrote:
Hams with big antennas probably know a lot about that.
On Sat, Aug 28, 2021 at 10:56 PM J Farmer <jfarmer@xxxxxxxxxxxxx <mailto:jfarmer@xxxxxxxxxxxxx>> wrote:
On 8/24/2021 7:05 PM, William Claybaugh wrote:
> I’m in the final stretch of finishing an (initially) 24 foot tall
> launch tower of triangular cross-section and fairly hell for stout.
>
> The last (known) problem is setting up the guys to keep the
front end
> from whipping during launch and under wind loads.
>
> I’ve worked out the geometry (four ground anchors on 24 foot
centers)
> to give a near 45 degree ground angle (52 degrees calculated).
But I
> am interested in the details of rigging:
>
> What wire rope diameter is appropriate and how does one calculate
> that? Does the sizing of the turnbuckles matter (12” of draw vs
> 6”?). Is stainless preferable? What do experienced riggers know
about
> this problem that I do not yet know?
>
> Bill
No answers from me(*), but I would query boatyards, especially
ones that
focus on sailboats of decent size.
(*) Eg. I have some reference books on sailboat design that talk
about
it, but real life has prevented me from digging into the subject.
John
