Practical Application of Line Stretch
Stretch is a concern for most serious sailors, especially when it comes to
halyards where stretch results in sag. Sag, in turn, allows for improper sail
shape which increases drag.
Traditionally, rope manufacturers list stretch over 100'. To measure stretch,
the line is set to a load that is usually 20% of its rated breaking strength.
However it is somewhat difficult to compare stretch characteristics, as most
lines have different breaking strengths.