There were some astonishing pictures in the press some weeks ago of a Royal Marine employing a jetpack to launch himself from a RIB to land on the deck of a ship with extraordinary precision. You cannot imagine that it would be a feasible proposition to equip pilots with such a device, but it did cross my mind after reading a horrible catalogue of disgraceful seamanship and poor design exhibited in what ought to be the simple matter of keeping pilots safe as they board and leave ships.
Many consider the Bristol Channel pilot cutter to be the finest sailing boat design ever. Fast, seaworthy and beautiful to behold, the pilot cutter is the perfect combination of form and function - a thoroughbred perfectly adapted to a life in one of the Britain's most treacherous stretches of water. Sailor and writer Tom Cunliffe explores the life of the pilots and sails a perfectly restored cutter to find out just what drove these men and their wonderful machines.
This video shows an introduction on the Spiral-Test-Manoeuvre and describes the procedure how to steer through this manoeuvre and measure the data needed. The results will be displayed in a characteristic diagram allowing to identify stable and unstable conditions and related, detailed information, e.g. spiral loop width and height, rudder angle of neutral effect. Samples of stable and unstable ship behaviour demonstrations will be shown by Fast Time Simulation using the SAMMON Planning tool.
