[TowerTalk] rigging for lifting a heavy mast?

[n8de at thepoint.net]

The simple solution:

Drill a hold through the upper end of the mast and insert a long 'screw eye'.

Hook the crane cable to the 'screw eye' and haul it up.

Most cable operators will know how to release this when it's in place.

73
Don
N8DE


Quoting n4zkf <towertalk at n4zkf.com>:

> We haul stuff up towers everyday with the Marline Hitch or Single Hitch as
> it's called. A Little tape at the bottom so it doesn't slip in the
> beginning and your off to the races.
>
>
> 73 Dave n4zkf
> e-mail: n4zkf at n4zkf.com
> web: http://www.n4zkf.com
> AR-Cluster node: 145.05 Mhz. or telnet://dxc.n4zkf.com:23
> N4ZKF/R 147.375 Mhz. Tone 103.5
>
>
>
>
>
>
> On 11/8/13 8:21 AM, "Earl Morse" <kz8e at wt.net> wrote:
>
>>
>>
>>> I'm going to be installing a 20' heavy steel mast in my tower (a Trylon
>>> 72' self-supporting tower).  I will be renting a crane to lift the mast
>>> and drop it from above.  What >kind of rigging do I use on the mast so
>>> it can be lifted up vertically, without the sling slipping up off the
>>> top of the mast?
>>
>> I have always used a clove hitch with an extra turn (
>> http://www.realknots.com/knots/hitches.htm#mwvsl  ) which I tie just
>> above center of gravity on the mast to prevent tipping on the way up.
>> Never knew it was called a rolling or magnus hitch.  To ensure that this
>> doesn't slide I usually put a muffler clamp on the pipe for the knot to
>> pull against.  A 22 ft. mast is just about at the limit of my gin pole so
>> sometimes I tie a tag line (loop) from the lifting line to the top of the
>> mast in order to prevent tipping.
>>
>> Tie it good.  If I remember right that mast weighed nearly 200 lbs and
>> was quite a pull.
>>
>> Earl
>> N8SS
>>
>>
>>
>>
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