sin() — DESK
SLING
ANGLE.
Two-leg bridle. θ from height and length. Tension from sin(). Compare T to the tag. Bookmark this URL. Print the numbers you just ran. Open once on a network — the desk stays on this device when the trailer Wi-Fi is dead.
Open once on a network. This desk stays on the device after that.
Last reviewed: September 5, 2026
01 — θ FROM THE TAPE
θ = SIN⁻¹ (H / L)
- H / L
- 0.500
- sin(θ)
- 0.500
- θ FROM HORIZONTAL
- 30.0°
02 — T FROM SIN()
T = W / (2 × SIN θ)
θ FROM THE TAPE30.0°
- sin(θ)
- 0.500
- 1 / sin(θ)
- 2.000
- T PER LEG
- 4000
03 — COMPARE TO THE TAG
T ≤ WLL
SAME UNITS AS WTAG
Optional. Read the sling tag after hitch and angle — not before.
Two equal legs. Centre of gravity in the middle. Vertical lift. θ from the horizontal — not the angle between the legs. H is hook centreline to the load connection. L is along the sling. This is the tag WLL. Choker and basket still apply. Three- and four-leg: if the load can tilt, design as two legs carrying.
| H / L | θ | SIN θ | FACTOR | T IF W = 4000 | WHAT IT MEANS |
|---|---|---|---|---|---|
| 0.500 | 30° | 0.500 | 2.00 | 4000 | Floor. Each leg sees W. |
| 0.707 | 45° | 0.707 | 1.41 | 2829 | Working bridle. |
| 0.866 | 60° | 0.866 | 1.15 | 2309 | Steep. Lower tension. |
| 0.966 | 75° | 0.966 | 1.04 | 2071 | Almost vertical. |
| 1.000 | 90° | 1.000 | 1.00 | 2000 | Vertical hitch. No spread. |
https://sin.ae.org/sling · Printed copy uncontrolled · Last reviewed: September 5, 2026