And yes, I will back guy the target tower.
Using this rope calculator for two different height anchors, I set one end
at H= minus 40ft to simulate the load lifted. and set the other height to
92, which adds up to the total height. Total tension = 1529 lbs. at that
point.
I realize the forces will change as the load position changes.
https://www.ropelab.com.au/two-point-anchor-calculator-2/?fbclid=IwAR1VmtTjTBDz37LrllZcp38nRUhBya9j06djqytUMxv6DI2-X32ZLRFPndw
H1= 175
The horizontal distance from anchor 1 to the load.
V1= -40
The vertical distance from anchor 1 to the load.
H2= 135
The horizontal distance from anchor 2 to the load.
V2= 92 (132-40)
The vertical distance from anchor 2 to the load.
Load = 313
The weight of the load.
Calculations:
L1= 179.5
The calculated length from the load to anchor 1.
L2= 162.5
The calculated length from the load to anchor 2.
T1= 701
The line tension to anchor 1.
T2= 828
The line tension to anchor 2.
Included angle: 158 deg
The angle between strands at the load. (180 degs = zero sag)
On Sat, Sep 14, 2019 at 10:02 AM Charles Morrison <junkcmp@gmail.com> wrote:
> Will this work using a TRAM system and not a crane ?
>
> Antenna to raise: 310 lbs x 48ft boom to be installed at 123'
> Tower: 132' 55G (130MPH guying) with starguy at 122'
> Tram wire: 1/4" EHS
> Pulley on tram wire
> Tram anchor point: at ground level @ 300ft away from target tower.
> Slope: 0.41
> Antenna launch point 135 feet away from target tower. (h=0) (165 ft from
> Tram anchor point)
> Attach 1/2" rope to TRAM WIRE PULLEY - up to pulley @ 130ft - then down to
> electric rope capstan.
> Begin tightening tram wire to slope thereby raising antenna located 165 ft
> from target tower off the ground.
>
> Then begin tramming antenna with electric rope capstan.
>
> What weight/mass do I need at the tram anchor point ?
> Tree ?
> Vehicle ?
> Deadman anchor in ground ?
>
> Antenna launch point can not be moved. Lot is too narrow and theres
> another tower nearby.
>
> As an alternative, I may a usable tram anchor point 400+ feet away. - I'm
> going out to look ant how that lines up now ....
>
> -Charlie N1RR
>
>
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