[TowerTalk] Re. Phillystran

[Roy Maull]

At 10:03 AM 03/02/2000 -0500, you wrote:
>
>On 3/2/00 9:31 AM, K7LXC@aol.com at K7LXC@aol.com wrote:
>
>>
>>In a message dated 03/02/2000 6:13:52 AM Pacific Standard Time, 
>>JSheinb785@aol.com writes:
>>
>>> PHILLYSTRAN might be great, but I've been using Dacron rope for over 20 
>>years 
>>> 
>>>  & the sun doesn't affect it, & once the initial stretch is made, no more 
>>>  stretching occurs. AND, it's less expensive.
>>
>>      You better not be using it for tower guying - it's TOTALLY unsuitable 
>>for that application. 
>
>Doesn't that depend on how BIG the rope is?
>
>It's an interesting thought problem -- how big would a Dacron rope have 
>to be to have the 4000 lb breaking strength (assuming a small tower) of 
>typical EHS or Phyllistran tower guys?  Second thought problem -- how 
>much would such a mongo Dacron rope cost per foot, compared to EHS or 
>Phyllistran?
>
>Any mechanical engineers out there?
>
>Certainly one can't replace 3/16" EHS with 1/2" Dacron rope. They aren't 
>even in the same league strength-wise.
>
>Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@radio.org
>Quote: "Boot, you transistorized tormentor! Boot!"
>            -- Archibald Asparagus, VeggieTales
>
	There are some ropes made for boats that have about the same breaking
strength as 3/16" wire.  But, you have to get to 5/16 or greater for 4400#
breaking strength.  The REALLY low stretch stuff is over $2.50 a foot, but
you can use lower stretch and pull like crazy to take up the stretch.  It
goes for about $1.00 per foot.
	I personally would not like to depend on rope (even Dacron) after sun
exposure for any real length of time.  Now, for a temporary guy during
construction, it would be great.  Light enough to be attached to the top of
the new section and hold it steady until a permanent wire guy can be attached.
	Just food for thought.




     73.. Roy  N8YYS
  Keep West Virginia beautiful.. Grow ALUMINUM!!


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