Eo Heavy Weight Torpedo, comes in 533mm size!

Name : Eo
Nickname : 'Rool Talisizie' , 'Rool'
Designation : BTHO Mod 1 (Battero-Talisizie-Havsv-Okaa, Battery Powered Heavy Torpedo)
Class : Heavy Weight Torpedo
Role: Anti submarines, anti ship
Length: 7 meters
Diameter: 533mm (21 inches)

Powerpack : 6x Al/AgO 'UWTB' module
Motor : Integrated Motor Propulsor Unit 'IME-1'
Propulsion configuration : IMP-Pumpjet System 'IMPE-1'
Maximum Attack Depth : 600 meters
Cruise Speed : 35 knots
Top Speed : 55 knots
Maximum Range : 50 km@55 knots, 120 km@18 knots

Weight: 1550 kg
Maximum Warhead Weight : 300 kg
Warhead : GeMT-1 or NTTS (5kt, 20 kt, 150kt, 250kt) or AMeT-1
Fuzing : Contact and computer controlled electronic proximity fuze.

Sonar System : Ilo Active/Passive Compact Sonar Array
Additional Sensor Systems : Vuums Wake-Homing System
Control System : Urna Digital Control System
Active Sonar Range : 600 meters
Cost : NSD 2.75 million

Writeup

Eo resulted from a joint project ran by 'Kato' Deep Sea Installation Institute and Hahao Kinematics Institute to find a suitable torpedo weapon in order to fill the gap of ASW capabilities of the Haishan's navy. Development of the new torpedo weapon started on third quarter year 2007 as mandated by Sashan Vidin which was advised by Haishan's Office of Admiralty to produce a completely native-derived weapon to reduce foreign dependencies and ensure resilient strike capability. Battery-dependent design was selected over thermal type design over advantages of being substantially cheaper and easier to manufacture (less critical components). The weapon is intended to be used against common submarines and for anti shipping use; currently Eo is a submarine-exclusive launched weapon primarily for ASW purposes.

Eo is a 7 meter long and 533mm diameter torpedo that utilize a composite structure to reduce its magnetic presence significantly. The main framework material of the torpedo is LM 25, BS:1490 aluminum alloy which gives Eo a good corrosion resistance inside seawater and this framework is supported by incorporation of Kevlar-carbon composite fiber weave for added durability. Power provided to the torpedo via utilization of several high energy density block batteries made out of Aluminum - Silver oxide (Al/AgO), connected to a GaAs power circuit. Contrary to common battery powered heavy weight torpedoes, Eo uses a completely new type of propulsion; an integrated motor propulsion unit called as 'IME-1' that puts the electric motor inside the propeller head opposed to common design of having the motor inside the torpedo. The 'IME-1' unit uses a brush-less permanent five blade magnet motor design, which turn itself when activated and drive the propeller housing giving better performance and significantly more silent operation compared to conventional arrangement considering gear couplings and bearings are reduced to a minimum level.

Coupling this motor would be the IMP-Pumpjet System 'IMPE-1' , which is a specialized water pumpjet system that incorporate extendable curved radial surface control fins to give Eo better maneuverability. The system is essentially an ordinary pumpjet that covers the propeller in exception of inclusion of four extendable curved radial control surface fins inside the recess of the inlet port of such system. The control surfaces protect the propeller from incoming water flow when the torpedo is launched and will be extended out when the torpedo assumes its active operation. To change direction, the torpedo can simply adjust the position of the extended curved radial control surface fins. These arrangements made it plausible for Eo to hit up to 55 knots top speed for its weight and allow quick maneuver or quick sprint over a distance while being underwater.

Common warhead fitted on Eo would be high explosive warhead GeMT-1 (General Mode Torpedo version one) consisting of a special mixture of FOX-7/CL-20 cocrystal explosive binded together with GAP. Alternate warhead arrangement of Eo would be NTTS scalable yield thermonuclear warhead which yield can range between 5kt to 250kt or AMeT-1 (Armour Breaching Mode Torpedo version One) consisting of a reactive liner warhead which liner is made of zirconium alloy and high explosive consisting of FOX-7 and GAP.

Fuzing is provided by contact fuzing and computer controlled electronic proximity fuzing system which interlinked with the sonar seeker of the torpedo. Guidance and control of Eo is provided by Ilo Active/Passive Compact Sonar Array, Vuums Wake-Homing System and Urna Digital Control System. Ilo Active/Passive Compact Sonar Array or simply called as Ilo is a dedicated sonar seeker consisting of several omnidirectional hydrophones and directional hydrophones; the array is capable to emit or receive sonar waves for purpose of intelligence in several focused sonar beams. It's capable to switch into passive mode when seeking a target and switch to active mode when attacking the target or completely stick to passive mode which sonar seeker operation depends on preset mission profile.

The array is capable to filter off non-designated acoustic signature which allow it to lock on a specific frequency, echo locate potential target with its LPI/LPR sonar mode and capable to differentiate collected acoustic data which includes IFF query emitted by nearby Eo torpedoes. Accuracy of the sonar array is improved by incorporating active acoustic canceller, to reduce false data or error in acoustic signature measurements. Commonly, as a torpedo moves through the sea, it will encounter sea resistance and considerable acoustic noise as the water flows around the torpedo's head where the sonar system would be. So the acoustic canceller seek to reduce these flow noises via implementation of several specific hardware and software; the canceller is composed of several accelerometers to measure structural vibration and attachment of the hydrophones to movable actuators for purpose of reducing acoustic flow noise mechanically and electronically.

The accelerometers installed on specific axises of the torpedo will give an electronic output to take into account of low frequency acoustic signature noise caused by the vibrating frame of Eo during maneuvering or by hydrodynamic flow noise acting on the torpedo and this output will be subtracted from the sonar seeker's data. These accelerometers are accompanied by several angular momentum sensors to increase their noise signal output to be of any use. The actuators on the hydrophones then instructed to move forward or backwards in a specific distance, to counteract these low frequency noises and as well flow noises caused by water flowing over the torpedo's head. All of these add up to basically extend practical active sonar range of Eo and as well better target discrimination given the canceller reduces instances of flow noise clutter acting on the torpedo.

The tracking capabilities of Eo is further supplemented with Vuums Wake-Homing System which is capable to track on surface waves caused by a passing vessel and interpret those wakes characteristics to a certain degree based on given preset mission profile, allowing limited target selection capability of Eo. Urna Digital Control System on the other hand is an fiber optic communication module which allows the torpedo to be controlled by the launcher via a fiber optics cable up to 50km out to the sea and which system processes the sensor outputs of Eo to make appropiate adjustments according to given mission profile.

References

Integrated motor propulsion ref 1
Integrated motor propulsion with magnetic blades
Integrated motor propulsion ref 2
LM25 alloy constructed torpedo depth reach
Radial control surface fins maneuvering
DM24A Torpedo
Mk48 Torpedo
Black Shark Torpedo
LM25 alloy
Active noise canceller

I seriously doubt that you'll get 50 km at 55 knots.

Using RL torpedoes as a baseline, they typically only get about 50 km maximum, and they have to travel at slower speeds for much of their travel in order to do this before they run out of fuel/battery power. I also very seriously doubt that you'll be getting a maximum range of 180 km, for the same reason. If you're going to have a weapon with such extreme ranges, then please be prepared to defend them.

55 knots...ah should have put it as terminal stage speed; the information on the torpedoes i referred are doable being military secrets and they(DM24A and/or Black Shark) seem to suggest to me that they can reach 50km at 50 knots speed. By the way, it's around 120km max range, not 180km and at such ranges it's at low speed of 18 knots. Since integrated motor propulsion is a new technology, there is not much can be said about it, other than i claim substantial improvement of speed, that and with the torpedo being longer(and heavier) to incorporate more batteries to handle with the increased motor load thus the top speed of 55 knots.

55 knots...ah should have put it as terminal stage speed; the information on the torpedoes i referred are doable being military secrets and they(DM24A and/or Black Shark) seem to suggest to me that they can reach 50km at 50 knots speed. By the way, it's around 120km max range, not 180km and at such ranges it's at low speed of 18 knots. Since integrated motor propulsion is a new technology, there is not much can be said about it, other than i claim substantial improvement of speed, that and with the torpedo being longer to incorporate more batteries to handle with the increased motor load thus the top speed of 55 knots.

As a terminal attack speed, 55 knots is doable.

I still don't see how you plan on getting a max range of 120 km, given that RL modern torpedoes aren't capable of doing that, even if you were to stuff more batteries into them.

Intelligent power management system? Well just had thought of such idea. Also claiming it's plausible due to incorporation of pumpjet (shroud over the integrated motor propulsion) arrangement compared to naked contra-rotating propeller arrangement. Claiming that pump jet arrangement allows greater speed compared to the referred torpedoes (they all use contra-rotating propellers except Mk48 ADCAP) due to the pumpjet arrangement increases the thrust of the torpedo compared to contra-rotating propellers per weight and size ratio. Due to the same reason, pumpjets are more efficient than contra-rotating propellers in using power, and the integrated motor propulsion eliminates the sources of power losses(bearings, gearings) thus giving overall increased range compared to common propulsion units.

Blackshark and DM24A do indeed get 50km at 50-55knots(depending on the fish) - and they are wire guided.

So fifty km isnt merely feasible, its done.

inb4 drone submarine laden with explosives