Bliss-Leavitt Mark 4 torpedo

{{Use dmy dates|date=September 2024}}

{{Infobox weapon

| name = Bliss-Leavitt Mark 4 torpedo

| image =

| caption =

| origin = United States

| type = Anti-surface ship torpedo{{cite web | title = Torpedo History: Bliss-Leavitt Torpedo Mk4 | url= http://www.history.navy.mil/museums/keyport/html/part2.htm | archive-url= https://web.archive.org/web/20121109202125/http://www.history.navy.mil/museums/keyport/html/part2.htm | url-status= dead | archive-date= 9 November 2012 | accessdate = 10 June 2013}}

| is_ranged = yes

| is_explosive = yes

| is_missile = yes

| service = 1908–1922

| used_by = United States Navy

| wars =

| designer = Frank McDowell Leavitt

| manufacturer = E. W. Bliss Company

| design_date = 1908

| number = 100

| variants = Mod 1{{cite web | title = United States of America Torpedoes Pre-World War II | url= http://www.navweaps.com/Weapons/WTUS_PreWWII.htm | accessdate = 24 June 2013}}

| weight = approximately 1500 pounds

| length = 197 inches (5.0 meters)

| diameter = 17.7 inches (45 centimeters)

| range =

| filling =

| filling_weight =

| detonation = War Nose Mk 1 contact exploder

| engine = Vertical turbine

| speed =

| guidance = gyroscope

| launch_platform = submarines

}}

The Bliss-Leavitt Mark 4 torpedo was a Bliss-Leavitt torpedo developed and produced by the E. W. Bliss Company in 1908. It was the first American-built torpedo specifically designed to be launched from a submarine. About 100 Mark 4s were purchased for experimental purposes by the United States Navy, which led to design improvements to the gyro and the reducing valve. It was used on submarines of the C and D classes. The Mark 4, and all other torpedoes designed before the Bliss-Leavitt Mark 7 torpedo, were considered obsolete and withdrawn from service in 1922.