What this calculator models
✓Static load at any X/Y position. Both sides locked off, full equilibrium. Use these values for anchor sizing, component selection, and MBS verification.
✓Worst-case anchor design loads. A package stopped at any position represents the maximum credible static force that position could impose on each anchor.
—Not a real-time tension model during active traverse. When one side hauls and the other lowers, actual rope tensions are operator-controlled through each DCD — not purely determined by geometry. Field studies show TTRS tension distribution ranges from 80:20 to 20:80 during movement. The geometry-based forces shown here are not the instantaneous forces on a moving system.
—Wide angle near an anchor is expected geometry. When the package is close to one anchor, the far rope spans nearly the full width and flattens — producing a wide interior angle. This is normal traverse geometry, not a force hazard, provided static forces stay within WLL. The alert system evaluates force against WLL, not angle alone.
—Not modeled: Dynamic loads, shock loads from arrest events, rope stretch under load, DCD friction losses (typically 20–30% efficiency reduction in practice), or lateral loading from terrain asymmetry.
Left T1 Left T2 Right T1 Right T2 Resultant
Package position — X axis
One side hauls, other lowers → package moves horizontally  |  Forces shown are static (both sides locked)
Package position — Y axis
Both sides haul → rises  |  Both lower → descends  |  Exit = Y at anchor height
System parameters
Forces — static equilibrium at current position
Interior angle
—°
Load
—kN
Left apex
—kN
Right apex
—kN
WLL (MBS÷SF)
—kN
Peak static force
—kN
Margin to WLL
—kN
—

Left anchor

Angle from vertical—
Static resultant—
Per rope (÷2)—
Role during traverse—

Right anchor

Angle from vertical—
Static resultant—
Per rope (÷2)—
Role during traverse—
Vortex AHD leg force analysis
A-frame easel — front leg compression, rear leg base anchor tension
▼
Apex load feeds from static TTRS calculation above. Leg forces calculated in the fore-aft plane. All Vortex tubes are identical aluminium components — C/T labels indicate axial loading direction. Rear base anchor (▲) is the tension element, not the tube.
Left Vortex — side view
Right Vortex — side view

Left Vortex

Apex
—
kN
Front ×2
—
kN C
Rear ▲
—
kN T
—
Lateral component—

Right Vortex

Apex
—
kN
Front ×2
—
kN C
Rear ▲
—
kN T
—
Lateral component—
C = compression in front leg tubes. T = tension at rear base anchor (▲). Lateral loading from X-traverse loads front legs unequally. Guy wires must be pre-rigged. Verify all values against Vortex rated component capacities.
Cross Haul System Calculator — TTRS with Vortex AHD  |  Static analysis only  |  For educational and pre-operational planning purposes. Always verify with qualified rigging assessment. © Rigging Lab Academy