[TowerTalk] Tilting tower query

[Roger (K8RI)]

> There are a lot of windmill monopoles for sale on the web
> that use this method of tilt up.  Suggest you read about
> them.  I've used this technique many times.  The "rigging"
> matters a lot.  The other pitfall is that the "stub mast" (also
> known as a "falling derrick") can buckle.  This buckling is
> encouraged if it sags from its own weight.  The fix for this
> is to put a mid span guy on it connected to the tower.

There were several towers that used this method for "folding over" available 
back in the 60s and 70s as I recall.  I thought ROHN even offered one at 
some time, but I may be confusing it with a similar set up.

These towers used a truss arrangement that looked almost like an add on to 
the upper portion of a standard tower. This truss extended down almost all 
the way to the base from the hinge point. They used a winch to pull the 
truss down which raised the upper portion.  I've seen tubular towers 
constructed in much the same manner.

Triasto I believe was one manufacturer.

73

Roger (K8RI)
>
> One fortunate aspect of buckling is that if the falling
> derrick is going to buckle, it will do so as soon as you
> try to lift off the tower.  Always lift the tower a foot
> or so and check for buckling.
>
> If you have a big yard, like I do, where you have room to
> lay down a tower, I highly encourage this methodology.
>
> On my web site (www.n6rk.com) there are photos of my 50 ft
> Glen Martin tower being erected with a falling derrick.
>
> Rick N6RK
>
>
>
>
>
> John Tait wrote:
>>
>>
>> Barry Kirkwood wrote:
>>> Greetings:
>>> Has anyone experience or comments on non telescoping tilting towers?
>>> That is: A rigid tubular or lattice mast with a stub mast and hinge.
>>> In the down posture looks like an assymetrical seesaw.
>>> Remember years back in a photo in the front pages of QST saw one of
>>> tubular
>>> steel maybe 100ft tall.
>>> In my case have a rugged lattice tower, 6x 10ft sections, wondering
>>> about
>>> making it a tilt tower.
>>> Would value any opinions, reports on experience before I spend money on
>>> calculations by a professional engineer.
>>> tnx es 73
>>> Baz ZL1DD
>>>
>>>
>> In one of the old ARRL handbooks, there was  a design for a tiltover
>> tower made of well casing. I've drawn a pic from memory at
>> http://www.iol.ie/~bravo/Well%20Casing%20Tower.htm. A friend EI9FE,
>> successfully built a scaled up version of this, in the region of 90ft .
>>   Vy 73
>>      John EI7BA
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>>
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk