Edit Rationale

Japanese Torpedo Fire Control

The original article stated that the IJN did not have automated torpedo fire control. I have found two credible references that state otherwise. ^[1] ^[2] Unfortuately, there are web references that say that the Japanese did not develop any torpedo fire control computers. This does not appear to be accurate.

TDC Only Useful Against Surface Target

The TDC really had no ability to deal with a target with depth. In fact, while torpedoes have a fixed depth setting, the TDC does not even have a depth input. ^[3]

TDC Still in Service

The original article discussed some recent (1980s) maintenance activity by the US Navy with the TDC. Since the TDC is still in service with at least one foreign navy, Taiwan, I thought it was better to mention this activiy and the support going toward keeping the TDCs operational. Therefore, I removed the original contribution.

References/Endnotes

^ Friedman, Norman (1995). US Submarines Through 1945: An Illustrated Design History. Naval Institute Press. p. 195. ISBN=1-55750-263-3. No other navy developed a comparable instrument [to the TDC]. The Germans and Japanese used angle solvers without position keepers (at least in the Japanese case, the device also had a timer that allowed it to dead reckon target position for indirect fire through smoke or mist). Probably because the Japanese had no TDC, they abandoned stern torpedo tubes in their later cruiser and fleet submarines on the grounds that they would require excessive gyro angles. {{cite book}}: Missing pipe in: |id= (help)
^ Jackson, USNR, Lt.(jg) J.G. (February, 1946). Japanese Torpedo Fire Control (PDF). US Naval Technical Mission to Japan. Fascicle O-1, Target O-32. The Japanese spent considerable effor on the design and manufacture of torpedo fire control equipment. The various units were well constructed and function with good accuracy. their submarine torpedo data computers and auxiliarly equipment were more simplified and less accurate than US equipment, while above water torpedo control gear (especially for cruisers) is more complicated and equal in merit to that of U.S. design. {{cite book}}: Check date values in: |date= (help)
^ Submarine Torpedo Fire Control Manual. Historic Naval Ship Visitor's Guide. 1952. Retrieved 3-July-2006. {{cite book}}: |work= ignored (help); Check date values in: |accessdate= (help)

[DesignHistory-1] Friedman, Norman (1995). US Submarines Through 1945: An Illustrated Design History. Naval Institute Press. p. 195. ISBN=1-55750-263-3. No other navy developed a comparable instrument [to the TDC]. The Germans and Japanese used angle solvers without position keepers (at least in the Japanese case, the device also had a timer that allowed it to dead reckon target position for indirect fire through smoke or mist). Probably because the Japanese had no TDC, they abandoned stern torpedo tubes in their later cruiser and fleet submarines on the grounds that they would require excessive gyro angles. {{cite book}}: Missing pipe in: |id= (help)

[JapanTechnology-2] Jackson, USNR, Lt.(jg) J.G. (February, 1946). Japanese Torpedo Fire Control (PDF). US Naval Technical Mission to Japan. Fascicle O-1, Target O-32. The Japanese spent considerable effor on the design and manufacture of torpedo fire control equipment. The various units were well constructed and function with good accuracy. their submarine torpedo data computers and auxiliarly equipment were more simplified and less accurate than US equipment, while above water torpedo control gear (especially for cruisers) is more complicated and equal in merit to that of U.S. design. {{cite book}}: Check date values in: |date= (help)

[tdc-3] Submarine Torpedo Fire Control Manual. Historic Naval Ship Visitor's Guide. 1952. Retrieved 3-July-2006. {{cite book}}: |work= ignored (help); Check date values in: |accessdate= (help)

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