Tower Safety Top Pulley + Heel Pulley Simulator
Tower Safety Rigging Lab • Forces Are Not Hidden
Top Pulley + Heel Pulley Simulator
Adjust the top pulley, heel pulley, load, hoist, and tag-line geometry. The image overlay moves with the inputs and keeps the same familiar Tower Safety simulator layout.
Animated Lift Visualization
Live overlay: 0° load angle • 0° hoist angle • 0° tag angle
Hoist Angle
0°
Load Line Angle
0°
Tag Line Angle
0°
Sling Angle θ
60°
Top Pulley Force
0 lb
0 N
0%
Heel Block Force
0 lb
0 N
0%
Resultant Anchor
0 lb
0 N
0%
Fy Horizontal
0 lb
0 N
0%
Fz Vertical
0 lb
0 N
0%
Geometry
Top: 100 ft
Heel: 20 ft
Load: 80 ft
Preset: SST
Mode: Teaching
Math Snapshot
Load line angle = DEGREES(ATAN(Load Distance ÷ (Top Pulley Height − Load Height)))
Tag line angle = DEGREES(ATAN(Load Height ÷ Tag Distance))
Hoist angle = DEGREES(ATAN(Heel Pulley Height ÷ Hoist Distance))
Sling factor = 1 ÷ SIN(Sling Angle θ). Lower sling angles increase sling-leg tension.
Spreadsheet force math: Fy(N) = TAN(Hoist Angle) × Hoist Distance × Load Weight. Fy(lb) = Fy(N) × 0.225. Fz(N) = Load Weight × Load Height ÷ SIN(Tag Line Angle). Fz(lb) = Fz(N) × 0.225. Resultant Anchor = √(Fy² + Fz²).
Teaching Reminder
This simulator is for education and planning. It does not replace a qualified rigging plan, engineered review, manufacturer instructions, WLL verification, or a site-specific hazard analysis.
