Aircraft carrier high-speed maneuvering for extreme rudder tests videos
In the above video, you can see a US Nimitz-class SUPERCARRIER Abraham Lincoln (CVN 72) engages in a series of EXTREME RUDDER TESTS during sea trials!
The aircraft carrier USS Abraham Lincoln (CVN 72), USS Harry S. Truman (CVN-75), USS Dwight D. Eisenhower (CVN 69) and USS Milwaukee (LCS-5) combat ship performs high-speed maneuvers and rudder tests.
In the above video, you can see Arleigh Burke-class warships in action Performing HIGH-SPEED HAIR-PIN TURN Indeed its a superb performance from a 505-foot-long, 9000-ton guided missile destroyer! This remarkable demonstration confirmed exactly why these Arleigh Burke-class warships are such prized assets within the United States Navy – they possess very impressive speed (in excess of 35 knots) and extreme maneuverability.
These evolutions put CVN 72 aircraft carrier steering systems to the test as the ship rolled more than 13 degrees in each direction.
During Aircraft carrier, rudder tests Aircraft carrier maxed out at 30 plus knots during the full-speed run and passed the rudder swing check.
When you are swinging the rudder fully left or right, it has to swing in a very precise position.
If it is off by even a degree, the rudder can cause serious damage to itself or the systems that control it.
Making sure the rudder was ready was not a one-man job.
It took the work of everyone, especially Sailors working in the hydraulics division.”
What is a ship Maneuvering test?
Following are a Maneuvering test that is tested on a ship
Full astern stopping test
Full astern stopping test determines the distance along the path described by the midship of a ship measured from the position at which an order for full astern is given to the position at which the ship stops.
The maneuver used to search for a man overboard.
It brings the ship on opposite heading and the same track as at the beginning of the maneuver.
The rudder is laid initially hard starboard, then at e.g. 60° relative to the initial heading.
It is laid hard port, and at, e.g. –130° to the midship position again.
The appropriate angles (60° and –130°) vary with each ship and loading condition and have to be determined individually so at the end of the maneuver the deviation in the heading is approximately 180° and in track approximately zero.
After a turning circle with the steady rate of turn, the rudder is returned to midship. If the ship is yaw stable
the rate of turn will decay to zero for turns both port and starboard. If the ship is yaw unstable, the rate of turn will reduce to some residual rate of turn.
The pull-out maneuver is a simple test to give a quick indication of a ship yaw stability,
however, requires very calm weather.
Turning circle maneuver
Starting from straight motion at the test speed
The rudder is turned to 35° or the maximum rudder angle permissible and kept at this angle
until the ship has performed a turning circle of at least 540°.
The trial is performed for both starboard and port side.
The main information obtained from this maneuver consists of tactical diameter, maximum advance, transfer at 90° change of heading, times to change heading 90° and 180°, transfer loss of steady speed.
Zig-zag test – 10°/10°
The zig-zag test is the maneuver where a known amount of helm (10°) to either side when a known heading deviation (10°) from the original heading is reached.
The test yields initial turning time, yaw checking time and overshoot angle.
After a steady approach, the rudder is put over to starboard (first execute).
When the heading is 10° off the initial course, the rudder is reversed to the same rudder angle to port
After counter rudder has been applied, the ship continues turning in the original direction (overshoot) with decreasing turning speed until the yaw motion changes direction.
In response to the rudder, the ship turns to port. When the heading is 10° off the initial course, the rudder is reversed again to starboard (third execute).
This process continues until a total of, e.g., five rudder executes have been completed.
20°/20° zig-zag test is performed using the same procedure with 20° rudder angles and 20° change of heading.