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Re: Forces on a dockline while docking....
I would be sure to use as stretchy a line as possible to absorb the impact. I would think either plait or three strand. I don't think this is a good use of double braided. You might want to put in some sort of rubber snubber on it to help make it a bit more comfortable.
A stretchy line will also store energy. If that cleat breaks loose from the dock, the more energy stored in the line the more will be transferred to the cleat, making it a several pound metal projectile. (google: Disneyland-boat-accident-death)
This whole maneuver is asking for trouble. If you miss the cleat, you crunch your boat. If you get the loop over the horns of the cleat, but don't get you fingers out of the way, you could easily lose a finger (or more). If the cleat parts ways with the dock, you have a projectile and a still moving boat.
Docking rule #1: never approach the dock faster than you're willing to hit it.
Never forget them. Do something to prevent it from happening again.
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