This is an improved Fender Whip that holds knots much better than a standard Fender Whip and is much easier to handle than standard double braid or three strand line. I got this trick from the Chief on a Coast Guard 41 ft Patrol Boat. I was helping with a combined Coast Guard Auxiliary, Coast Guard training exercise. At the end of the day while we were going over what went right and what could have been done better. I noticed that the fender whips on the Coast Guard fenders had the core stripped from the double braid line used to tie the fenders on the boat. When I ask why, their response was that the knots held better.
That evening when I got home I took a piece of double braid line, removed the core and tested the no core line with different knots around different objects that simulated boat parts. I found that knots in the double braid line without the core were more secure. The double braid line with no core was also easier to handle.


