Now you have to get whatever information you need for the base. The base,
needless to say, is very important for an unguyed tower. (you only have to
worry about the tower not sinking into ground for a guyed tower.)
Good luck,
Hans - N2JFS
-----Original Message-----
From: Patrick Greenlee <patrick_g@windstream.net>
To: towertalk <towertalk@contesting.com>
Sent: Tue, May 20, 2014 12:06 pm
Subject: Re: [TowerTalk] Fwd: Mast/tower design close in guyed by shrouds and
spreaders?
I got a bargain tower that is a current project for refurb and
reinstall. It started life as a 100 ft tall tower with a wind generator
on top. Gyroscopic forces generated by wind shifts without the wind
slowing before changing directions resulted in the top 60 ft and the
generator falling to the ground in a twisted mess. I bought the bottom
40 ft for about $200. I have tilted it over to the ground and will soon
dismantle it for transport to my location. The legs are made of 6 each
20 ft lengths of 4 inch ID 1/4 inch thick steel tube with welded on
flanges for bolts. Hopefully I will have better luck with the tower than
the original owner. I do not anticipate massive gyroscopic forces in
the service for which lit will be used.
73
Patrick NJ5G
On 5/19/2014 9:56 PM, Hans Hammarquist via TowerTalk wrote:
> I think you can find what you are looking for if you check out design of
towers for wind generators. They are usually a cone shaped structure. A other
approach is how towers for high voltage (and i mean really high voltage) power
lines are designed.
>
>
> The power line towers appears much more like "standard" ham radio towers (My
opinion.)
>
>
>
> I would not try to design something from scratch.
>
>
> Hans - N2JFS
>
>
>
> -----Original Message-----
> From: Ray, W4BYG <w4byg@att.net>
> To: towertalk <towertalk@contesting.com>
> Sent: Mon, May 19, 2014 3:19 pm
> Subject: [TowerTalk] Mast/tower design close in guyed by shrouds and
spreaders?
>
>
> Is there any readily available design/build information for designing a
> modest height (35 to 46 feet) ham tower or mast, that would be close guyed
> using spreaders? This would allow guying with close in dimensions, probably
> anchored about the same distance from the base as the spreaders are long.
>
> It would be something like what is done with spreaders and shrouds on
> sailboats. I have studied the subject relating to sailboats but the related
> sail mast bending forces seem to complicate the subject.
>
> Close in guying is practical and possible with proper design. I am aware of
> an original 1000' TV tower in Jacksonville, FL (ch 4) that the guys (no
> spreaders just straight guys) went out somehting less than 200'. Ch 17's
> original 1000' tower (in downtown Atlanta) was self supporting and as I
> recall only had a base of about 50 maybe 75'. So wide 2/3h and 3/4h guying
> is not always necessary. With good information, close in guying schemes
> should be in some circumstances, possible and practical.
>
> Anyone have any insight on the subject?
>
> Ray, W4BYG
>
> "The Republic (America), can survive a fool like Barack Obama, who is after
> all, merely a fool. It is less likely to survive a multitude of fools,
> such as those who made him their president." Vaclav Klaus, Former Premier
> Czech Republic
>
>
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