[TowerTalk] [Bulk] Re: tower insulators

[Bill Aycock]

Steve--
I think YOU didn't understand what was said. Gordon, (I think) said:
" So you use 3/8 fiberglass rod into each leg and the rods go into the
concrete?" (Direct cut-and-paste)
That is NOT guying with fiberglass rod. That is the scenario I think is a 
hazard. If that is not one of the options being discussed, then I retract my 
comment.
Bill--W4BSG

-----Original Message----- 
From: Steve Maki
Sent: Monday, September 01, 2014 6:54 PM
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] [Bulk] Re: tower insulators

Which scenario, Stan's or Gordon's? Gordon didn't understand Stan's
(obviously). Stan is shearing grade 8 bolts with fiberglass (leg) rod
(c. 1-1/8" or so) in an unguyed situation, which kind of proves that
fiberglass rod is pretty damn strong and won't be a weak link.

Then he decided to guy the towers with 3/8" fiberglass rod. I'm guessing
that that would have avoided the need to beef up the leg insulators, but
he did both, now he's got a towers that will stay up in most strong breezes.

-Steve k8LX

On 9/1/2014 6:16 PM, Bill Aycock wrote:

> Pardon me, but this looks like a disaster watching for a place to happen.
> Bill--W4BSG
>
> -----Original Message----- From: w2ttt at att.net
> Sent: Monday, September 01, 2014 11:22 AM
> To: Stan Stockton ; Grant Saviers
> Cc: Gordon Beattie ; towertalk at contesting.com ;
> comtechgroup at yahoogroups.com
> Subject: Re: [TowerTalk] [Bulk] Re: tower insulators
>
> Stan,
> So you use 3/8 fiberglass rod into each leg and the rods go into the
> concrete?
> If you have photos, that would be helpful.
> 73,
> Gordon, W2TTT
> 201.314.6964
>
> Sent from Samsung tablet
>
> -------- Original message --------
> From: Stan Stockton <wa5rtg at gmail.com>
> Date: 2014/09/01  11:35  (GMT-05:00)
> To: Grant Saviers <grants2 at pacbell.net>
> Cc: "J. Gordon Beattie, Jr., W2TTT"
> <W2TTT at ATT.NET>,towertalk at contesting.com
> Subject: Re: [TowerTalk] [Bulk] Re:  tower insulators
>
> I have four 60 foot 25G towers that have a solid rod of fiberglass in
> each leg.  These towers were in guyed for several years in a pretty
> harsh environment on top of a mountain.  After having grade. 8 bolts
> break several times I then bridged the upper and lower sections on each
> leg with a piece of fiberglass plate which is something like 4 inches
> wide, a foot long and about. 3/8 thick. It is held with galvanized. U
> bolts.  After seeing the towers bend in about a. 60 mph wind, I used 3/8
> fiberglass rod to guy them to small, homemade anchors - rod welded to a
> short piece of angle.  Each anchor is in about a bag of Quickcrete.
>
> Sent from Stan's IPhone
>
>
>
>> On Sep 1, 2014, at 10:12 AM, Grant Saviers <grants2 at pacbell.net> wrote:
>>
>> The max wind combined guy loads for a 100' tower can be around 4000#
>> downforce on the tower base (plus the tower weight) so something more
>> than 1" delrin will be required between the legs.  That amount of
>> force obviously works ok with the tapered pier pin base, but the leg
>> span of straight R25 or larger will require some steel structure
>> behind whatever insulator is used.  I think modifying a tapered pier
>> pin base section bottom plate for an insulator block of delrin/nylon
>> would be easier/cheaper.
>>
>> Grant KZ1W
>>
>>
>>> On 9/1/2014 7:29 AM, J. Gordon Beattie, Jr., W2TTT wrote:
>>> Bob, Steve et al,
>>>
>>> Any thoughts on what might be a good approach to insulating a Rohn 25
>>> tower
>>> from the ground?
>>> I was thinking of a pin base in a lower slab of nylon or delrin
>>> insulating
>>> material sandwiched with another upper slab of insulating material
>>> that has
>>> bolts into the tower legs.  These could be bolted together at the
>>> corners.
>>> When I say, "slab" I am thinking about 0.5-1.0 inches in thickness.
>>>
>>> My concerns are that the might be stronger and possibly cheaper.  Any
>>> thoughts?
>>>
>>> 73,
>>> Gordon, W2TTT
>>> 201.314.6964

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