Rope is civilization's connective tissue — it builds, lifts, secures, climbs, and rescues. This campaign covers fiber selection, cordage construction, splicing, rigging, and load calculations for every application.
Chapter 1: Fiber Sources for Cordage
Fiber
Breaking Strength
Rot Resistance
Flexibility
Availability
Best Use
Manila (abaca)
Very high
Good
Moderate
Tropical cultivation
Heavy rigging, mooring
Hemp
High
Good
Good
Temperate cultivation
General purpose, marine
Sisal
Moderate-high
Moderate
Stiff
Tropical/subtropical
Agriculture, baling
Cotton
Moderate
Poor
Excellent
Warm climate cultivation
Soft applications, sash cord
Jute
Low-moderate
Poor
Good
Tropical
Light binding, burlap
Linden bark (bast)
Moderate
Moderate
Good
Temperate forests (wild)
Emergency, primitive cordage
Nettle
High
Moderate
Good
Temperate (wild)
Fine cordage, fishing line
Yucca/agave
Moderate-high
Good
Stiff
Arid/subtropical
Desert cordage, sandals
Rawhide
Very high
Poor (if wet)
Low (dry)
Any (from animals)
Lashing, binding
Sinew
Very high
Moderate
Moderate
Any (from animals)
Bowstrings, sewing
Chapter 2: Cordage Construction
Type
Strands
Twist Direction
Strength
Flexibility
Time to Make
Two-ply (simple)
2
S-twist (reverse lay)
Moderate
High
1 ft/5 min
Three-strand (laid)
3
Z-twist strands, S-lay
High
Moderate
1 ft/10 min
Four-strand (square)
4
Alternating
Very high
Low
1 ft/15 min
Braided (8-strand)
8
Interlocked
High
Very high
1 ft/20 min
Cable-laid
3 ropes twisted together
Opposite to rope twist
Very high
Low
Requires finished rope
Two-ply cordage (fastest field method): 1) Prepare fibers (strip, ret, or pound to separate). 2) Bundle fibers into two equal groups. 3) Twist one group clockwise (Z-twist) between fingers. 4) Wrap that twisted group counter-clockwise (S-direction) around the other. 5) Now twist the second group clockwise. 6) Wrap counter-clockwise around first. 7) Repeat — the opposing twists lock together. 8) Add new fibers by overlapping 2-3 inches into existing strand. 9) Result: cord that holds together under tension because twist fights untwisting.
Three-strand rope (standard): 1) Spin fibers into yarn (tight Z-twist). 2) Combine 3-20 yarns into strand (S-twist — opposite direction). 3) Lay three strands together (Z-twist — back to original direction). 4) Each reversal of twist direction locks the previous level in place. 5) Rope diameter and strength scale with number of yarns per strand.
Chapter 3: Strength and Load Calculations
Rope Diameter
Manila Breaking Strength
Safe Working Load (5:1)
Weight/100ft
Common Use
1/4 inch
600 lbs
120 lbs
1.5 lbs
Light lashing, clothesline
3/8 inch
1,350 lbs
270 lbs
3.5 lbs
General utility, tent lines
1/2 inch
2,650 lbs
530 lbs
5.5 lbs
Moderate lifting, rigging
5/8 inch
4,400 lbs
880 lbs
8 lbs
Heavy lifting, anchoring
3/4 inch
5,400 lbs
1,080 lbs
10.5 lbs
Construction, mooring
1 inch
9,000 lbs
1,800 lbs
16 lbs
Heavy construction, towing
1.5 inch
18,500 lbs
3,700 lbs
36 lbs
Ship mooring, heavy rigging
Safety factors: Always divide breaking strength by safety factor to get working load. Minimum 5:1 for general use. 8:1 for life safety (climbing, rescue). 10:1 for overhead lifting of people. Knots reduce strength 25-50% (figure-8 loses 25%, bowline loses 35%, square knot loses 50%). Wet rope loses 10-15% strength. Aged/worn rope: inspect and retire when fibers are broken or rope is stiff.
Chapter 4: Essential Knots and Hitches
Knot
Purpose
Strength Retained
Difficulty
Untie After Load
Bowline
Fixed loop (won't slip)
65%
Moderate
Easy
Figure-8 loop
Fixed loop (climbing)
75%
Low
Moderate
Clove hitch
Attach to post/pole
65%
Low
Easy
Taut-line hitch
Adjustable tension
65%
Moderate
Easy
Sheet bend
Join two different ropes
55%
Low
Easy
Trucker's hitch
Mechanical advantage tie-down
65%
Moderate
Easy
Prusik
Slide-and-grip on rope
65%
Moderate
Easy
Timber hitch
Drag logs/poles
70%
Very low
Falls off when slack
Constrictor knot
Permanent binding
60%
Low
Cannot untie (cut off)
Anchor bend
Attach to ring/anchor
70%
Low
Moderate
Chapter 5: Splicing
Splice Type
Purpose
Strength Retained
Difficulty
Time
Eye splice
Permanent loop in rope end
90-95%
Moderate
15-30 min
Short splice
Join two rope ends (thicker)
85-90%
Moderate
20-40 min
Long splice
Join two ropes (same diameter)
85%
High
30-60 min
Back splice
Prevent end from unraveling
100% (no loop)
Low
10-15 min
Eye splice (three-strand rope): 1) Unlay 6-8 inches of rope end into three strands. 2) Form loop of desired size. 3) Tuck first strand under one strand of standing rope (against the lay). 4) Tuck second strand under next strand. 5) Turn over, tuck third strand under remaining strand. 6) Continue tucking each strand over-one-under-one for 3-5 full tucks. 7) Trim ends. 8) Result: permanent loop that retains 90-95% of rope strength (vs. 65% for bowline knot).
Chapter 6: Rigging and Mechanical Advantage
System
Mechanical Advantage
Rope Needed
Complexity
Max Practical Load
Single fixed pulley
1:1 (direction change only)
1x height
Very low
Rope's working load
Single movable pulley
2:1
2x height
Low
2x human pull
Block and tackle (2 pulleys)
3:1 or 4:1
3-4x height
Moderate
3-4x human pull
Compound (3+ pulleys)
5:1 to 8:1
5-8x height
High
5-8x human pull
Spanish windlass
4:1 to 10:1
Short rope + lever
Low
Limited by lever/rope
Capstan/windlass
10:1 to 50:1
Wrap around drum
Moderate
Very heavy loads
Reference Card
Opposite twists lock (Z-twist yarn, S-twist strand, Z-twist rope — each level locks the one below). 2. Safety factor 5:1 minimum (never load rope above 20% of breaking strength for general work). 3. Knots weaken rope (every knot reduces strength 25-50% — splice where possible). 4. Wet rope is weaker (10-15% strength loss when wet — account for this). 5. Inspect before every use (broken fibers, stiffness, discoloration = retire the rope). 6. Splice beats knot (90-95% strength retained vs. 55-75% for knots). 7. Pulleys multiply force (each additional pulley adds mechanical advantage — 4 pulleys = one person lifts 400 lbs). 8. Never stand under load (if rope fails, anything underneath dies — always stand clear).
