The tactical diameter of a
ship
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying cargo or passengers, or in support of specialized missions, such as defense, research, and fishing. Ships are generally distinguishe ...
is the distance:
* travelled on sea surface
* during a
turning circle
The turning diameter of a vehicle is the minimum diameter (or "width") of available space required for that vehicle to make a circular turn (i.e. U-turn). The term thus refers to a theoretical minimal circle in which for example an aeroplane, a g ...
test
* with maximum rudder angle
* by the
center of gravity
In physics, the center of mass of a distribution of mass in space (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may ...
of a ship
* taken perpendicular to the initial track followed at approach speed
* when the heading has changed by 180°
The ratio of the tactical diameter divided by the ship's length between
perpendicular
In elementary geometry, two geometric objects are perpendicular if they intersect at a right angle (90 degrees or π/2 radians). The condition of perpendicularity may be represented graphically using the ''perpendicular symbol'', ⟂. It can ...
s gives a dimensionless parameter which can be used to compare ships maneuverability.
External links
*http://ittc.sname.org/new%20recomendations/pdf%20Procedures%202008/7.5-04-02-01.pdf
Marine engineering