『 陸軍武器 』－ M48 巴頓將軍(Patton)坦克

克里斯Chris

M48 Patton
Developed from the M47 "General Patton" tank, the M48 was the mainstay of the US Army and Marines in Vietnam. Some 11,703 M48s were built between 1952 and 1959. Originally they had 90mm guns, but upon moficiation to the M48A5 standard they were given the British 105mm. The M48 was withdrawn from American service in favor of the M60, a further development of the M48, but the M48 Patton remains in service in a number of armies around the world.


The M48-A2C featured a gasoline engine which was very prone to fire. This model  was replaced in 1968 by the M48-A3 powered by a diesel unit. In the 1970's development of the AVDS 1790 2C/2D series of engines, rated at 750 Horsepower, were utilized in the M60A3, Retrofited AMX-30 Tank, Modernized Centurion Tank, M88A1, Retrofited M47, and Modernized M48A5 Tank. In the 1980's the AVDS 1790 Red Seal Engines, rated at 750 Horsepower were used on the Upgraded M48A5 and the Upgraded M60A3 Tanks. In the 1990'S, the AVDS Gold Medallion Engine, producing 750 Horsepower was produced and used in the upgraded M48A5 Tank.
The M48 vehicle is separated into three compartments: the driver's compartment, the fighting compartment where the Gunner, Loader, and Tank Commander [TC] fought, and the engine compartment. Above the main gun was a 1 million candle-power Xenon searchlight. This light had both a white light and an infrared mode. It was boresighted with the main gun and gunsights so that it could be used to illuminate a target at night.

The M48 was been designed for combat in Europe against Soviet tanks.  When first deployed, the M48-A3 had for the 1960s a state-of-the-art fire control system. At the time computers were mechanical, and range to the target was provided by a stereoscopic range finder, which functioned similarly to a 35mm camera. An end-box on each side of the turret exterior held a prism-type mirror. Turning a hand-crank on the range finder would pivot these mirrors until the double-image in the range finder merged.   As the distance between the mirrors is exactly  known, a little trigonometry provided the range (in meters) to the target. This information was displayed on a range indicator, and also fed to the ballistic computer by a rotating shaft. The ballistic computer was a collection of gears and cams--nothing was solid-state--which had a handle so that the gunner could select the type of ammunition that was to be fired. Each round had a different muzzle velocity, and therefore the computer had a different cam for each type. The computer would take the range data, merge it with the velocity data, and via a set of rotating shafts, supply this information to the gun's super-elevation mechanism, resulting in the gun being elevated above the gunners line of sight sufficiently for the round to overcome the downward pull of gravity on its way to the target. The gunner's sight however remained locked onto the target.

克里斯Chris

A good crew in Europe was able to put the first round on target 90% of the time, but this required excellent teamwork and communication on the part of the entire crew. In peacetime qualification, it was possible to stop from a speed of 20 mph, acquire the target, and get off a first round kill at 2,000 yards in seven seconds. This precision fire control system was almost irrelevant in Vietnam where typical engagement ranges could be measured more reasonably in feet than in  yards.  So in Vietnam it was common to take the gunner out of the  turret and put him on the back deck with an M16 or M79 for close-in protection.  This also afforded him some protection from mines, and indeed the tank commander and loader often rode on the turret roof or the hatch lips when mines were expected.   The TC laid the main gun by eye, and fired using the commander's override control or a lanyard to the manual trigger on the main gun. Most M48's in Vietnam had the commander's .50 cal. mounted on top of the cupola on a simple pintle mount.   This location gave a better field of fire, was faster to reload, and less prone to jamming than when the M2 was placed on its side inside the armored cupola. But the TC was terribly exposed to fire when firing the M2.

Rocket Propelled Grenades were a constant threat in Vietnam, and M48 tanks countered this threat by mounting Pierced Steel Plank, chain link fence, and spare track blocks on the fenders to prematurely detonate incoming RPG's.  The bustle rack was extended with welded steel, and  the turret sides buttressed with extra .50 cal. ammo, C-ration cases, and the crew's duffel bags. The cases of C-rations strapped to the infantry rail on the turret, like the PSP and track blocks, acted as a stand-off shield. If an enemy anti-tank rocket struck the C-rations, it would explode prematurely. Since anti-tank rounds require a certain stand-off distance to function effectively, the C-rations dissipated the force of the explosion away from the armor.   It was also the only place to store the rations, since space in the vehicle was at a premium and occupied mostly by ammunition.

Canister and HE were the primary main gun ammunition types used in Vietnam. Beehive was effective, but usually in short supply. WP was useful, but dangerous to carry since it ignited if split open by a mine or RPG strike, so crews tended to expend it as soon as possible. HEAT briefly was popular after NVA tanks were engaged at Bien Het, but HE was usually preferred against bunkers.

克里斯Chris

Variants

• M48A5K South Korean variant with 105mm, improved FC system, and considered more capable than early M60s.
• M48A5E Spanish variant with 105mm, laser rangefinder.
• M48A5T1 is a Turkish upgrade, similar to M48A5, the T2 variant includes a thermal sight.
• CM11 Taiwan variant with a modified M48H turrets mated to M60 hulls. An advanced fire control system includes a ballistics computer and stabilized sights with thermal imaging [similar to the US M1 Abrams tank] slaved to the 105mm gun, providing improved target tracking on the move.
• CM12 Taiwan variant mates the CM11 turret to existing M48A3 hulls.
• AVLB variant used by Israel and Taiwan.
• M67 flamethrower featured a shorter, thicker barrel than the normal 90mm armed version.

克里斯Chris

[tr][/tr][tr][/tr]

Specifications
Dimensions	Hull length	21ft, with gun forward 30ft 6 in
	Width	11ft 11in
	Height	10ft 1 in
	Ground Clearance	16 in
	Track Width	28 in
Weights:	Total	52 tons 107,997 lbs [M48A5]
	Hull	20 tons
	Turret	18 tons
	Engine/Transmission	6 tons
	Engine cover	2 tons
	Track	2 tons each
	Basic load	2 tons
Performance:
	Range	258 miles / 463 km
	Top speed	40 mph / 48 km/h
	Fuel consumption:	1 g/mi road, 2 g/mi offroad
	Fording:	1.2 m
	Vertical Obstacle:	0 .9 m
	Gap Crossing:	2.59 m
Powerplant:
	Engine	Continental AVDS
		1790 cu in 690 horsepower
	Transmission	Alison CD-850

克里斯Chris

Armament:
	Main gun	90 mm rifled cannon 64 rds 105mm /51 cal M68 rfled gun with 54 rounds [M48A5]
	Tank Commander	.50 cal M2 HB machine gun 3000 rds
	Coax	7.62mm M73 machine gun 10,000 rds
	Ammunition:	HEAT (High Explosive Anti-Tank)
		HEP (High Explosive Plastic)
		Canister
		WP (White Phosphorus)
		Beehive
Armor:		Homogeneous cast steel
	Hull Front	120 mm
	Hull Side, front	76 mm
	Hull Side, rear	51 mm
	Hull rear	44 mm
	Hull floor	25 mm
	Turret Front	110 mm
	Turret Side	76 mm
	Turret Rear	50 mm
Crew:		4 (driver, gunner, loader, TC)
Used by	Greece (714 M48A5), Iran, Israel (400 M48A5), Jordan, South Korea (950 M48A5K), :Lebanon (90A1&A5), Morocco (224 M48A5), Norway (38 remaining A5s awaiting disposal), Pakistan (280 M48A5), Portugal(86 M48A5), Spain (164 M48A5E), Taiwain (309 M48A5, 158 M48H), Thailand (100 M48A5), Tunisia, Turkey (578 M48A2C, 179 M48T-5, 1369 M48A5T1, 750 M48A5T2).

克里斯Chris

M48  三視 & 比例圖

克里斯Chris

M48 舊照

克里斯Chris

M48結構特點

　　一、總體布置

　　該系列坦克採用整體鑄造炮塔和車體，車體前部是船形的，內有焊接加強筋，車體底甲板上有安全門。車體分前部駕駛艙，中部戰鬥艙和尾部動力艙，動力艙和戰鬥艙間用隔板分開。

　　　

　　M48坦克無需準備即可涉水1.2m深，裝潛渡裝置潛深達4.5m。在潛渡前，所有開口均要密封，在發動機格柵右后位置豎立潛渡通氣筒；潛渡時需要打開排水泵。

二、武器系統

　　

　　1.主要武器

　　該系列坦克的生產型車主要武器都採用1門M41式90mm坦克炮，俯仰範圍為-9°～＋19°，炮管前端有一圓筒形抽氣裝置，砲口有導流反射式制退器，炮閂為立楔式，有電擊式擊發機構，炮管壽命為700發。

　　2.彈藥　

　　M48A3坦克裝90mm砲彈62發，其中駕駛員左側19發，右側11發，炮塔底板水準放置8發，炮塔座圈周圍豎立16發，炮塔內另有8發待用彈。該車可選用多種砲彈，包括M580曳光殺傷彈、M82曳光被帽穿甲彈，M77曳光穿甲彈、M318曳光穿甲彈、M336和M337榴霰彈、M71曳光榴彈、M431破甲彈、M332A1曳光高速穿甲彈、M353曳光教練彈和M313黃燐發煙彈以及比利時或以色列研製的新型尾翼穩定越速脫殼穿甲彈。

3.輔助武器　

　主炮左側安裝1挺7.62mmM73式並列機槍，車長指揮塔上安裝1挺12.7mmM2式高射機槍，其俯仰範圍為-10°～＋60°，且能在指揮塔內瞄準射擊。

克里斯Chris

三、推進系統

　　

　　1.動力裝置

　　該系列生產型車之間的差別主要是發動機的選用。M48、M48A1坦克採用AV-1790-5B、7、7B、7C幾種汽油機和CD-850-4、4A、4B幾種傳動裝置，燃料儲備均為757L，最大行程僅為113km。

　　

　　為提高最大行程，M48A2坦克改用AV-1790-8發動機和CD-850-4D傳動裝置。該發動機的特點是用新的燃料噴射系統取代了原來的汽化器，提高了燃油經濟性。此外，由於發動機油冷卻器位於發動機上方，因此發動機頂艙蓋加高。這樣既抑制了紅外輻射，又增加了燃料箱容積，從而提高了戰鬥行程。

　　

　　M48生產型車動力艙內還裝有1台用來帶動發電機發電的單缸4衝程風冷汽油機，燃料由主發動機燃料箱供給，在主機不工作時使用。生產型車還裝有總容積為830L的附加油箱。

　　

　　2.行動裝置

該系列坦克採用扭桿懸掛，每側有6個鋁制雙輪緣掛膠負重輪，M48A1每側有5個託帶輪並有1個履帶張緊輪(在主動輪和第六負重輪之間)，M48A2及以後各咱車型改裝3個託逞輪，並取消履逞張緊輪，第一、二、六負重輪處均裝液壓減振器。

克里斯Chris

四、防護系統

　　

　　該系列坦克均採用整體鑄選成型車體，車頭和車底均採用船身的圓弧形，炮塔是圓形的，不同部位的裝甲厚度從25mm到120mm不等，因此具有相當好的裝甲防護力。

　　

　　M48A2、A3和A5坦克採用制式三防裝置。