Bob,
You can build a tilt over fixture for this. Drop me a note and I will send you
details.
73
NJ0F
Sent from my iPad
> On Oct 13, 2017, at 10:16 PM, Grant Saviers <grants2@pacbell.net> wrote:
>
> It's nearly impossible as you ask since as the angle to the ground decreases,
> it is a full person reach upward with more than the tower weight as the force
> needed. It's a lever, so holding at 1/4 the length from the base and man
> height (5.4', 45 degree angle) the center of mass exerts more than the tower
> weight on the people who are then the pivot point. At that angle of tilt and
> support point the force on the tower pivot bolts is upward. I've seen a
> tower permanently bent when a well intentioned helper placed a support too
> near the pivot of a partially tilted tower.
>
> Something to consider when a stepladder is used as a temporary support. It
> might be instantly temporary or bend the tower or both. Also remember that
> rotator, mast, and antennas move the center of mass upward/outward
> significantly since they are effectively all concentrated loads beyond 22'.
>
> A derrick or falling derrick is what you need. A couple of sticks of Rohn 25
> as a fixed derrick next to the pivot, with a strong back guy, some side guys,
> and a winch. The guys MUST be low stretch, wire or low stretch rope, NOT
> nylon.
>
> Grant KZ1W
>
>
>> On 10/13/2017 16:44 PM, Bob Matthews wrote:
>> Hello All,
>> I have a Hygain 52SS crank-up tower on a hinged base. Has anyone on here
>> tried to walk a tower down this size? It's 22 feet nested. Weighs about 400
>> lbs I believe. Wondering how many men it would take to walk it down on it's
>> hinged base from the vertical to the horizontal position on the ground. I
>> don't believe there's enough room to get a crane in to do this, so I'm
>> wondering how many people it would take to walk it down.
>> Thanks in advance for your input.
>> Bob KT3RR
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|