Take a look at about 1:48. The big drum to the right of the chain is a band brake, and the handwheel tightens the band around it. After 1:50 the two sailors aren't thinking clearly. The chain is hung up and they keep on loosening the brake band far beyond where it makes any difference. Then when the chain starts to run they have to frantically wind it back up again.
Slightly wrong - The anchor holds the ship, but the weight of the chain holds it level to the sea bed, so when chain is pulled from the actions of tide and wave the pulling is 100% laterally, and never upward toward the ship, and this means that the anchor is effectively drawn deeper into the sea bed, I think you need the chain to be at lest 6 times the depth in order that the chain lies on the sea bed.
Not when under test conditions. U NEED to be able to anchor and BRAKE it Manually if ship suffers TOTAL LOSS of POWER to avoid shipwreck. In Safety regs somewhere I think
The chain's catenary sag cushions shock loads and is a function of lateral force, scope, and the unit weight of the chain. The angle of pull at the anchor can generally be 5 to 10 degrees above horizontal and still allow the anchor to bury. In strong winds most of the chain's sag vanishes in whoich case a nylon rope and chain hook (known as a "devils claw") should be used to grasp the chain and restore shock absorbing to the system.
