[TowerTalk] Trylon software

Fri Jun 27 02:11:13 EDT 2003

Guy:

     I had a copy of this software available when I was designing my own
Trylon 500-64 system.  It sure was an eye-opener to see that the tower would
fold considerably above ground level in an overload.  Also, the ground level
reaction for my system was the main reason I went with the larger
foundation - the standard foundation was inadequate by a small amount.  And
yes, ice is a real bugger.

     All in all, my system will withstand winds that are rarely seen in the
DC area.  I can sleep OK at night as a result.

73 de
Gene Smar  AD3F

----- Original Message ----- 
From: "Guy Olinger, K2AV" <olinger at bellsouth.net>
To: "EUGENE SMAR" <ersmar at comcast.net>; "Pete Smith" <n4zr at contesting.com>;
"TowerTalk" <Towertalk at contesting.com>
Sent: Friday, June 27, 2003 12:11 AM
Subject: Re: [TowerTalk] Trylon software


> Hi, Gene.
>
> Thanks for the URL.
>
> Got out the data for my Trylon and antennas and put stuff in,
> including the mast. Got basically the same overall figures as by other
> means.
>
> It was interesting to note the Kips going down the tower showing where
> the tower would go if stressed to the limit, right in the middle
> (30-40' down on 80').
>
> If it's designed right a tower of this sort will collapse in the
> middle at over stress, since the base had better not be moving at all.
>
> Was also interesting to see that at collapse, the overturning moment
> was only about a third of what it would take to move my base.
>
> According to the figures, my setup would have ridden out Hurricane
> Fran at this distance from the coast (80MPH out in the open at RDU
> airport), with a small margin of safety, tho the antennas probably may
> have been damaged. Have to take off 16 feet down at the coast tho.
>
> Also did 1/2 inch radial ice (estimated) and 50 mph, which it did NOT
> survive.
>
> Did 1/2 radial ice and 25 mph, which it DID survive.
>
>
> ----- Original Message ----- 
> From: "EUGENE SMAR" <ersmar at comcast.net>
> To: "Pete Smith" <n4zr at contesting.com>; "TowerTalk"
> <Towertalk at contesting.com>
> Sent: Thursday, June 26, 2003 3:49 PM
> Subject: Re: [TowerTalk] Trylon software
>
>
> > Pete:
> >
> >      Agreed.   In the version of the posting that I did NOT send out
> I had
> > included details of my antennas and what method I used in the model.
> I
> > thought better of providing this info for fear it may be misapplied.
> I will
> > say that I took a conservative approach when I modeled my
> installation.
> >
> >      However, what the Trylon software DOES demonstrate is that one
> gets
> > dramatically different results when assuming the antenna elements
> are round
> > vs flat plate.  It also shows what happens to the stresses on a
> selected
> > tower when the antenna load is moved up the mast.  One can see how
> easily a
> > tower can fail by installing a significant antenna sail area ten
> feet above
> > the top of the tower.  Plus, at least in the model of my tower and
> antennas,
> > the first tower segment to fail is NOT the bottom one.  Interesting.
> >
> >      BOTTOM LINE:  Caveat Amateur.
> >
> > 73 de
> > Gene Smar  AD3F
> >
> >
> >
> > ----- Original Message ----- 
> > From: "Pete Smith" <n4zr at contesting.com>
> > To: "EUGENE SMAR" <ersmar at comcast.net>; "TowerTalk"
> > <Towertalk at contesting.com>
> > Sent: Thursday, June 26, 2003 2:11 PM
> > Subject: Re: [TowerTalk] Trylon software
> >
> >
> > > At 12:03 PM 6/26/03 -0400, EUGENE SMAR wrote:
> > > >TT:
> > > >
> > > >      I found an interesting piece of software on the Trylon
> Titan web
> > page:
> > >
> >http://www.trylon.com/lightdutytowers/selfsupporttwrs_size_towercalc.
> asp
> > .
> > > >It's the program Trylon use to determine whether a selected tower
> will be
> > > >adequate for a combination of proposed antenna loads.  You'll
> need to
> > input
> > > >the antennas' wind area and other parameters regarding the
> physical
> > > >arrangement on the mast.
> > > >
> > > >      I suggest you read the instructions and thoroughly
> understand them
> > (and
> > > >the caveats) before you apply them to a proposed configuration of
> TRYLON
> > > >TITAN TOWERS (emphasis intended.)  If nothing else, you can see
> the
> > effect
> > > >of increasing antenna mounting height on the reactions at each
> section of
> > > >tower.
> > > >
> > > >73 de
> > > >Gene Smar  AD3F
> > > >P.S.  Don't forget to include the wind area and weight of your
> mast.
> > >
> > >
> > > And K7NV would be disappointed if I didn't also caution to be
> careful that
> > > the antenna wind area figures you use are calculated on the same
> basis as
> > > the numbers that Trylon uses to rate its towers.  Combining apples
> and
> > > oranges can result in trying to put as much as 1.5 times the rated
> amount
> > > of antenna area on the tower.
> > >
> > > 73, Pete N4ZR
> > > The World HF Contest Station Database was updated 17 June 03.
> > > Are you current? www.pvrc.org/wcsd/wcsdsearch.htm
> > >
> > >
> > >
> >
> > _______________________________________________
> >
> > 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 at 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 at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk