Sea ranger loran manual

The size of the tube at the top is 2 inches in diameter. This makes the attack periscope difficult to detect, either by eye or by radar. The length of the attack periscope is 44 ft. This enables the submarine to be slightly deeper when attacking, a tactical advantage in case of aircraft and enables the submarine to save previous seconds if forced to go deep by an escort.

It is fitted with the following:. The magnification in low power is 1. The size of the tube at the top is 7. This makes this periscope a good visual and a good radar target. The length of the search periscope is 40 ft.

To estimate the range of a target: 1 Switch on the scale illuminating lamps, if necessary. NOTE : When using the periscope for normal observation the operator should first check that the estimator prisms are swung out of the beam, lest definition is adversely affected.

This is done by rotating the estimator control so that the scale reads zero, then pushing fully inwards and rotating to 'OUT'. Magnification in low power 1.

General Description The equipment comprises en air dose rate detector, a water activity detector, an indicating unit and a power unit. General Description Cont'd b Indicating Units One display unit Mark 4NV is fitted at the central control position and contains the meters which provide measurement of the level of radiation in the air and water around the submarine. The information provided is as follows: Air Dose Rate meter range 10 -4 - 50 rad.

Water Activity meter range 0. These levels may be pre-set between the following limits: A. The audible warning can be silenced by depression of the 'mute' switch. A 'reset' switch is provided to reset the alarms. Magnetic indicators show when each channel is:.

The second power unit is a spare. The ratemeter and alarm units are identical for the two channels. The test unit enables the ratemeter and alarm units to be set up and checked and the power supply voltages to be monitored. Basic Principles The initial purpose of a Submarine Fire Control System is to resolve the track on which the torpedo must travel in order to intercept the target. This track can be considered as a lead angle from the target bearing on firing, and is therefore influenced by both target movement and own motion.

Another function, no less important, of the system is to relay weapon settings of depth, speed, track and pattern of run from the Control Room to the individual torpedoes.

The final function is to pass command signals to a wire guided torpedo after discharge. The Fire Control Problem As with any guidance and direction system, the aim is to place a weapon, or pattern of weapons, on a given target. The variables affecting submarine fire control problems are:. The Fire Control Problem Cont'd With these known variables, the fire control calculator or computer will produce and transmit headings on which the torpedoes must travel in order to intercept the target.

Fire Control Computer The computation that has to be made by the fire control system is to determine the torpedo track required. Own and target data is continuously updated either manually or automatically from sensors. This track is then related to own ships head to give a precision gyro angle to the weapon. In the case of a multiple weapon firing, this angle becomes a mean angle and is converted to the linear spread; each torpedo then receiving different track.

Adjustments can be received by the torpedo up to the moment of individual release. Folks, C. Richard Pekelney Webmaster. To operate the set, the submarine reduces to the maximum self quiet state Ultra Quiet State and swings in. The limitations of this set are: i Susceptible to high self noise ii Poor stern arc coverage iii Loss of detection when firing torpedoes this has been reduced with "swim out" torpedoes. Sonar Sets Capabilities and Limitations 2 Type Cont'd The sensitivity of the set falls off at very low frequencies but can be maintained constantly down to about cycles.

The sets limitations are: i The set has a low detection range due to its high operating frequency. Sonar Sets Capabilities and Limitations 4 Type Type is the main underwater communication set; it has 3 transducers each with beam width, one mounted on the casing looking upward, and one each in Port and Starboard tanks. The tape is played back at slow speed to allow a more accurate evaluation of:. Antennas used dived near the surface.

It is used for the following:. ARL Table Cont'd 1 Dead reckoning navigation when dived 2 Local operation plot at action stations 3 Anti collision plot at blind pilotage 4 Navigators work bench stowage is provided beneath the plot for charts and nay. It is fitted with the following: 1 Artificial horizon sextant 2 Action broadcast microphone 3 Split image range finder 4 Range transmission to the fire control calculator 5 Bearing transmission to the fire control calculator and the bearing indicator above the chart table 6 Top window de-icing heaters.

It is fitted with the following: 1 Ranging radar - very short transmission 2 Action broadcast microphone 3 Split image range finder 4 Camera aperature. The Search Periscope Cont'd 5 Bearing transmission to the fire control calculator end the bearing indicator above the chart table. Magnetic indicators show when each channel is: i On.

This alarm indication can only be reset when the level falls below the pre-set level. The variables affecting submarine fire control problems are: 1 Target range and relative speed across the line of sight 2 Own speed across the ling of sight 3 Weapons characteristics.

Fire Control Computer Cont'd In addition to solving the gyro angle for a particular target set up, the computer can track a target on a given course, speed and range and is able to receive updating ranges and bearings. Retransmission Component Parts Previous mention was made to the ability of the system to transmit torpedo settings to the weapon.

Much depends upon the type of weapon as to what settings are required. These fall into two catagories: 1 Synchronous The Synchronous settings are those set from the computer and are: a Gyro Angle torpedo track b Enabling distance c Depth 2 Non-Synchronous The Non-Synchronous settings are put on by a separate instrument in association with the system.

The nature of these settings will vary with type and mod of weapon, but usually include: a Speed b Homing mode c Horizontal Search d Stratum E.

Guidance Certain types and 'Mods' of torpedo can be given guidance after release from the submarine. This is made possible by maintaining continuity between the fire control system and the weapon by a light single core wire. Commands to the weapon are given in azimuth and depth from the submarine where a D. Further developments in submarine weapons are followed, and in particular new 'Mods' to the MK 37 torpedo which it is anticipated will be considered for RCN submarines.

System Components 1 Calculator - located in the control room Inputs a Own speed log b Own course gyro c Torpedo characteristics set by hand d Enemy co, speed, and range estimations set by hand Output Mean Gyro Angle MGA 2 Gartu - located in the control room gyro angle retransmission unit This accepts the MGA from the calculator and spreads the salvo about it. Some of the torpedoes in the salvo will travel to the right and some to the left of the MGA for greater target coverage.

The synchronous and non synchronous settings are also set on the torpedo from the TOFI. Finally, the torpedo is fired from the TOFI. This instrument is used to guide the MK 37 mod 1 and mod 2 torpedoes after they have been fired.

The operator keeps two pointers aligned; one represents the torpedo, the other represents the target. Then "BANG". Diesel Engines. Oberon Home Page. Learn More - opens in a new window or tab Any international shipping is paid in part to Pitney Bowes Inc. Learn More - opens in a new window or tab.

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