Kevin's truss calculator

Kevin's Truss Calculator

For use only by Kevin Coelho also check my math because this is proabbly wrong

General Truss Cantilever Calculator explainer

Cantilever length (A) — feet Back span length (L) — feet Applied load at end of cantilever (P1) — pounds Rigging cable weight at F1 — pounds Rigging cable weight at F2 — pounds Applied weight at F2 (W1) — pounds Truss type

Total truss length

36.00 ft

Truss self-weight: 270.0 lb (7.5 plf)

Equivalent simply supported span

Le = 48.00 ft

Equivalent point load P2 = 12.0 lb

Load at F1 (back rigging point)

288.0 lb

Load at F2 (cantilever rigging point)

< 250 lb

-6.0 lb

Add at least 256.0 lb at F2. Includes 1.5× safety for uplift (9.0 lb)

Back span (L) is less than 3× cantilever length (A). Increase back span.

Cantilever length exceeds 10 ft maximum.

Truss Types (per Christie Lites)

Type	Size	Weight (plf)
A	12"	6
B	16"	7.5
C	20.5"	8.5
D	Swingwing	18
E	Tall Swingwing	20
F	Track Truss	15.75

General Notes

Verify against Christie Lites simply supported span tables for Le with P2 at mid-span.
No faceplates are allowed in a cantilever.
Cantilever point load must be hung evenly across both bottom chords.
Stability analysis by a competent engineer is recommended.