UDT 2020 ASW using LWTs from Submarines ORUWA / Thomas Petersson 2020-02-25 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
ASW Using LWTs from Submarines • Background • ASW – The Challenge • ASW from Surface Units • ASW from Submarines • LWTs on Submarines • Current Swedish LWTs • Summary 2 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
3 Background – HWTs in Sweden Operational 3 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
4 Background – LWTs in Sweden Operational and New 4 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
Background – LWTs in Sweden Craft of Opportunity Surface Ship Submarine Aircraft 5 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
ASW – The Challenge X Z In deep waters the distance to the target Y • In blue waters: can be in the same order of magnitude as the water depth. - Few problems exist with hydro acoustic disturbances caused by reverberation and other sources of noise. This can be generalised into a three - When a target is detected, the possibilities to dimensional scenario (X-Y-Z volume). escape are limited. - A fire-and-forget torpedo can be used effectively. The launch trajectory and the time required to enter a controlled and stable run are less critical. - A torpedo must be dimensioned to sustain the water pressure when combating deep sea targets. • In shallow waters: In shallow waters the combat- and detection ranges can be much greater than - Reverberation from the surface and from the seabed, the depth. Here the majority of actions and other sources of noise, are frequent. take place over a horizontal area. - Influence from sound-velocity gradients are generally larger, meaning that significant refraction occurs. This can be generalized into a two - A submarine can hide near or on the seabed, dimensional scenario (X-Y plane). in areas where seabed reverberation is high. - The systems must be designed for shallow waters X and a complex hydro acoustic environment. Y 6 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
ASW – The Challenge Baltic Sea - Winter Conditions Baltic Sea - Summer Conditions Sound Velocity Sound Velocity Shadow Zone Shadow Zone Distance from the transmitter Distance from the transmitter Sound Velocity Sound Velocity Shadow Zone Distance from the transmitter Distance from the transmitter 7 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
ASW from Surface Units • In Anti-Submarine Warfare (ASW) from a surface unit there is an asymmetry between hunter and target: - The detection range for a Hull Mounted Sonar (HMS) or a Dipping Sonar (DS) can be extremely reduced. - The submarine takes advantage of hydro-acoustic shadow zones . - The surface units may be affected by adverse weather conditions and hostile activities. 8 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
ASW from Submarines • In Anti-Submarine Warfare (ASW) from a submarine the asymmetry between hunter and target is reduced: - The detection ranges for the submarine sensors (FAS and CAS) are comparable. - Both submarines can utilize hydro-acoustic shadow zones to their advantage . - Both submarines operate in the same environment and are not affected by the sea state and weather conditions. 9 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
LWTs on Submarines – Dedicated Tubes VGD Class Arrangement GTD Class Arrangement 6 x HWT Tubes 4 x HWT Tubes 3 x LWT Tubes (x 2 Torpedoes) 2 x LWT Tubes (x 2 Torpedoes) Total: 6 + 6 Torpedoes (RTF) Total: 4 + 4 Torpedoes (RTF) 10 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
LWTs on Submarines – 53 cm Tubes A tube insert that can be handled as a unit load is used to adapt the existing 53 cm torpedo tubes to the LWTs. For integration of LWTs on submarines equipped with HWT tubes. 11 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
LWTs on Submarines – Dedicated Tubes Torpedoes are taken onboard using the same systems and methods as used for HWTs. 12 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
LWTs on Submarines – Logical Integration GTD Class Arrangement 4 x HWT Tubes 2 x LWT Tubes (x 2 Torpedoes) Total: 4 + 4 Torpedoes (RTF) 13 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
Current Swedish LWTs Torpedo 45 Torpedo 47 ASW/(ASuW) ASW/(ASuW) 14 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
Current Swedish LWTs - Tp47 Overview Torpedo 47 Key Features • Homing System Resolution Stator / Rotor / Duct Motor • Communication by Wire Connector • Wide Speed Range • Neutral Buoyancy Proximity • Endurance Fuse SAI • Silent Run Warhead Servos / Rudders FLS (Lithium Iron Phosphate) Wire / Fibre Magazine Battery FLS Electronics Computer & Electronics 15 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
LWTs on Submarines – Benefits • From an operational perspective - Optimized solution using a submarine for ASW - Provides a secondary additional ASuW capability - Can be used as a self defence weapon - Evolutionary use as an Anti-Torpedo Torpedo (ATT) • From a logistics perspective - Weapon system with smaller on-board footprint - Increases the number of ready to fire torpedoes • From a design perspective: - Robust and can withstand higher shock-loads 16 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
Summary • LWTs on Swedish Submarines - Utilizes dedicated smaller torpedo tubes - Have been operational for decades • A Tube Insert can be used for integration - Can be handled as a unit load - Compatible with existing HWT handling systems - Flexible use of the fixed HWT tubes • Using LWTs from submarines - Smaller on-board footprint - Increased number of RTF torpedoes - Robust system - Additional self defense capability 17 COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
Thank You Thomas Petersson / ORUWA COMPANY RESTRICTED | NOT EXPORT CONTROLLED | NOT CLASSIFIED ORUWA / Thomas Petersson | Issue 1
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