Monday, January25, 2021
Privacy Policy

Line Stretch Comparison

Leave the force blank to display the line breaking strength for the lines and sizes listed as well as the published stretch at 10%, 20%, and 30% of breaking strength. Enter a force and the stretch at that force, using interpolated stretch values, will be displayed in percent. Enter line length in feet and the table will be line stretch in inches. You can enter the load force directly (leaving winch power blank) or put the effort on the winch handle (probably around 20 to 35 pounds) and the winch power ratio to let the program calculate the total force. The power ratio is the gear ratio times the ratio of the handle length to drum radius. Enter a safety factor (5 is typical) and all entries that exceed that safety factor will be in red. The line lenght with a winch is the length from the winch to the clew for example. For a multi-part system, it is the length between the blocks, not the total lenght of the line running through the blocks. The Jib Wind Load Calculator may be useful in estimating load numbers.

If your favorite line is not shown, contact me in the Forum and I will add it if strength and stretch data is published.

NOTE: Strength and Stretch data is from manufacturers data sheet. Some of these numbers are suspect so please double check anything presented here as there may be errors. It was recently pointed out that the data showing VPC has more stretch than StaSet is certainly not correct but that is what the data sheets show. .

Force in pounds (use 20 to 50 for human power). Blank for strength table:
Winch power ratio (if winch)
Length (of system if multi part, not line) feet. Blank for %:
Safety Factor (results will be red)

Strength (pounds), or stretch (% or inches)
Size Load7/64"1/8"3/16"1/4"5/16"3/8"7/16"1/2"9/16"5/8"3/4"@10%@20%@30%
7x19 wire1,7603,7007,000.16%.32%.48%
Endura Braid2,5004,0007,00010,00014,00019,00025,20030,00037,4001.00%
Flight Line2,5004,0004,7001.25%1.4%1.7%
MLX (updated)1,7003,4006,9008,70012,20014,0000.70%0.90%1.10%
Progen II5,5008,00011,00017,50024,00030,00036,50046,00068,0000.5%0.74%1%
Regatta Braid2,5003,4004,5005,9007,50011,0001.5%3%4.5%
Regatta Lite1,0502,5603,2002.5%5.0%6.5%
Samson MLX1,8003,8004,5007,2009,50015,0000.7%1.1%1.4%
Sta-Set X1,6002,7004,4005,5007,4009,6000.75%1.8%2.8%
Tenex TEC3,2004,7006,1009,50013,10018,80024,8001.4%2.3%3.0%

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