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As the strength of gun steel is increased, resistance to fatigue failure and cracking under high pressure decreases. gun and the M110 8-inch howitzer had identical carriages but different tubes. Unfortunately, what was to later become the science of fracture mechanics and related fatigue failure was not well understood or appreciated at this time, and the original 175mm M113 Gun experienced premature catastrophic brittle fracture at a very low round count. Figure 2 – French 75mm Field Gun, Dayton, Ohio (author’s photo). Actually the shells themselves are quite cheap, under $100 each (I have read reports that the shell, by itself, costs as low as $20 each). Retubing could also be used to convert the 175 mm M107 to the 203 mm (8 inch) M110. An M107 provides fire support for ground forces in Vietnam War, 1968. gun fired a 174-pound projectile almost 33 kilometers. The M107 was retired from the U.S. Army in the late 1970s but it continues to see use in many armies around the world. When these guns were outranged by rocket fire from Tyre, they were upgraded with the addition of extended range, full bore ammunition and new powder supplied by Gerald Bull's Space Research Corporation. The M110s eventually were replaced by the M207 MLRS. Put another way, as strength, pressure, and performance increase, cannon life decreases, sometimes dramatically. Free shipping. One such artillery piece is the M107 self-propelled howitzer.This 175mm artillery piece entered service in 1962, alongside the M110, an eight-inch self-propelled howitzer.It could fire shells as far as 25 miles away – and this long range proved very handy during the Vietnam War. Two cranes were used – one on either end of the barrel. The firing of the 175mm self-propelled guns on 19 November 1965 in Vietnam was the first time ever fired in combat. The gun didn't see service long past the Vietnam War. In fact, Olive-Drab.com reported that the two self-propelled howitzers could exchange guns, thus a M107 could become a M110, and vice versa. The M107 self-propelled 175-mm. Longer tempering times allowed impurities to migrate to grain boundaries. SGT Max Cones (gunner) fires a M107, 175mm self-propelled gun, Btry C, 1st Bn, 83rd Arty, 54th Arty Group, Vietnam, 1968. The M107 was also used by the Israel Defense Forces in the various Arab–Israeli conflicts. The weight of the M55, at 44 metric tons, prohibited air transportation and its gasoline engines limited its range to approximately 260 km, as well as presenting an explosion hazard in combat. "true" : "false") + "; expires=" + d.toUTCString() + "; path=/";
Electron microscopic examination (a very recent tool for the period) revealed that the impurities in the lower life tubes were most prevalent in the grain boundaries, where in the longer life tubes they appeared well distributed longer life tubes, they appeared well distributed. The number one cannoneer opens and closes the breech, verifies ramming of the round with ram rod and powder load red on the rag (which means he can see the red igniter patch to verify that the powder is not put in backwards),[6] loads the primer, hooks up the lanyard (pig tail), pulls lanyard on command, and unlocks the right spade lock. At field force the proportion of 8-inch and 175-mm. $200.00. Description. In addition to its long range it was also noted for its inaccuracy at longer ranges. The gun was assigned to corps artillery units and a number of M107/M110 composite units were formed allowing the option of responding with the longer range M107 or the more accurate M110. Temper embrittlement also contributed to brittle failure mode. Weapons used by Vietnamese irregular forces, http://www.military-today.com/artillery/m107.htm, http://www.youtube.com/watch?v=OWCNfR50jsc, https://vietnamwar.fandom.com/wiki/M107_Self-Propelled_Gun?oldid=5497. The M107 was used extensively in Vietnam to provide long range firesupport (being able to fire more than 30 km) and took part in numerous cross-DMZ duels with NVA guns. Some of the most notable are the French 75 of World War I, or the Napoleons used during the Civil War, or the German 88. Paccar received the M107 and M110 design contracts and initial manufacturing single source bid from Detroit Arsenal. From Latvia. Although withdrawn from U.S. service in the late 1970s it continues in service with some armies as of 2010. The M107 had a long reach, but it was not accurate – rounds like the laser-guided Copperhead or the GPS-guided Excalibur had not been developed yet. The projectile is a hollow steel shell filled with 14.6 pounds of TNT or 15.4 pounds of Composition B.The shape is ogival with a boat-tail for aerodynamic efficiency. Cannons that could fire effectively (based on the new wear additive) past 1,000 rounds were now being taken out of service at 400 rounds or less. Free shipping. It was exported to several other countries including Germany, South Korea, Spain, Greece, Iran, Israel, Italy, the Netherlands, the United Kingdom, and Turkey. The only projectile used by the American army is HE M437A1 or M437A2 whose range is approximately 32.7 KM. script.setAttribute("src", "//www.npttech.com/advertising.js");
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