I drove some adjusted plastic rods into the end and bottom of 4 x 6
meters 50 mmm x 3mm alu. tubing. All were bolted together through
adjusted allu. sleeves. I just took care the plastic rods won't absorb
humidity. Indeed I did remember when I went to stone groves with my
father ( half a century ago ) Splitting of stones of about 6 cub meters
was done simply by drilling holes then putting dry wood rods in the
holes and put water on it. It took about an hour to split the stone off.
No explosives during were allowed during wartime.......and no choc waves
damage which was a great advantage of this method.
So just be aware not all wood specie may be used.
Looking at the bright bleu sky today, I just wonder why nobody thought
about bleu...... hi hi
BTW high wind torsion on this allu. mast is about 10 to 12 degrees. Not
dramatic for a 3 elements beam when stations are real DX. On the other
hand I gues torsion on the rotor will be somewhat less with this upset.
But that?s just a feeling. Someone can confirm correctness ?
Have fun all.
Jos on4kj ( Also oo4kj in 2005 and OR5G in, contest
-----Message d'origine-----
De?: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] De la part de MIKE GREENWAY
Envoyé?: mardi 1 février 2005 13:50
À?: Barkey, Patrick M.; towertalk@contesting.com
Objet?: Re: [TowerTalk] How to stiffen a mast
I thought about this some years ago and had a friend turn some solid oak
dowels on his lathe that would just go into the mast. I used a hammer
to
tap them into place but I brushed on epoxy just to take up any spacing
between the two. I capped the mast on both ends. It has been there for
years. I asked a structual engineer afterward about doing this and he
said
they sometimes combine wood with metal to increase the strength.
Whether it
is worth doing or not I cannot say but it made me feel a lot better.73
Mike
K4PI
----- Original Message -----
From: "Barkey, Patrick M." <pbarkey@bsu.edu>
To: <towertalk@contesting.com>
Sent: Wednesday, January 26, 2005 8:15 PM
Subject: [TowerTalk] How to stiffen a mast
I've been using 24 foot, half inch wall, 2.5 inch OD aluminum masts
on all of my towers for quite a few years, with no failures or real
problems. During the recent ice storm, however, a couple of them
flexed a little more than I'd like to see (they've since sprung back).
Now that I have the opportunity to think this over, I am wondering
if it would be of any value to try to add a little more stiffness to
the existing mast by driving something into the hollow center.
I've got a 1.5 inch ID hole to work with - perhaps some pipe or
solid rod could be driven into it?
Wondering if anyone has ever tried anything like this?
- Pat
N9RV
.
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
any
questions and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
any questions and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
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