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Minggu, 06 Desember 2009

T-34


The T-34 was by far the best tank design in World War 2. In addition to having an excellent combination of firepower, armor, mobility, and shape, its superb technical design, which emphasized simplicity and durability, made it possible to mass produce it in enormous numbers, and gave it very high field and combat reliability, two critical attributes which the advanced German tanks lacked. It was the main war winning weapon of Russia in World War 2.
The T-34 was a medium tank which evolved from a series of pre-war Russian light tanks, which were designed for very high speed (53mph with tracks, and over 60mph in good roads without tracks!!) and long travel range, features which made them a formidable weapon for fast advances very deep into enemy territory, but they severely lacked firepower and armor, so they were not suitable as main battle tanks. Some modern wheeled military vehicles armed with powerful anti tank missiles and machine guns can be regarded as more successful descendants of this type of fighting vehicle.
As a result of the need for an all-purpose main battle tank, the T-34 was developed as a medium tank descendant of those fast light tanks, gradually evolving from their superb technical design, but designed to be a capable main battle tank. The T-34 was lower in height (8ft) than German and American tanks, which was better in using the terrain for taking cover and make it a smaller target to hit. It had sloped armor in both the front and side hull and the turret, which made it harder to penetrate, and of course it had a powerful 76mm gun, which was then a large caliber, and sufficiently thick armor. During World War 2 the gun of the T-34 was upgraded to a more powerful long-barrel 76mm gun and later to 85mm gun, to keep up with the advances in German tank guns and armor.
Initial production and deployment of the T-34 was before the German invasion of Russia. Small numbers of T-34 tanks participated in a series of border battles between Russian and Japanese forces in the far East in early 1941, just three months before the German invasion to Russia.
Both the new T-34 tank and Zhukov, who was later Russia's top military commander in World War 2, made their impressive early debut there, in the far East. Both were noticed and reported by the Japanese, but the Germans ignored those reports and were therefore shocked when they met the first T-34 tanks in combat later that year when they invaded Russia. The Germans so appreciated the performance of the T-34 that when the German military discussed the development of their next tank, the Panther, one of the suggested designs was simply a German copy of the T-34.
There were still small numbers of the new T-34 when the invasion began, and the rapid German advancement so deep into Russia, as far as Moscow, forced the Russian industry, which already lost countless factories, to an unprecedented operation of literally moving its entire remaining military industry factories over 1000 miles further East, to Siberia, to avoid losing it to the advancing Germans.
In those newly built factories, Russia's military industry restored and far exceeded its pre-war mass production capacity. The furious motivation of the Russian production workers to stop the terribly cruel German invaders which were more brutal than Russia's own brutal Communist regime, and the desperate draconic measures of the Russian regime itself, in which being late to work in a factory during the war could result in 10 years imprisonment, gave the wartime Russian military industry the high efficiency that Communism never reached before or after World War 2. In wartime Russia, workers and soldiers alike were motivated by the desire to revenge and the fear of draconic punishments, and were paid in food, which soldiers and workers received while the rest of the population starved severely during the war.
The immense production rate of the T-34 was further boosted by the fact that massive American and British material support enabled the Russian war industry to focus all its effort on the production of a small number of main weapon systems, while other greatly needed equipment, such as trucks and jeeps, field rations and even some aircraft types, were supplied in large numbers by the western allies.
So after the initial tremendous defeats in 1941 which cost Russia millions of soldiers and a huge lost territory, since mid 1942 the Russian army was equipped with rapidly increasing numbers of T-34 tanks which matched the German tanks and increasingly outnumbered them.
Since late 1942, in the late stages of the great battle of Stalingrad, and then in the huge tank battle in Kursk in mid 1943, and until the end of the war, T-34 tanks in ever increasing large numbers, outnumbered and crushed the German tanks, and pushed the German invaders all the way back to Berlin, serving as one of the main war winning weapons of World War 2.
The T-34 was a medium tank, weighed 26 tons. It had a crew of four, it had a good speed of 55kmh (34mph) and a range of 115 miles. During the late stages of the war, the Russian army perfected its mobility so much that tanks were sometimes refueled while still driving forward, without stopping, and the Russian infantry used to keep pace with the advancing tanks simply by riding on them from one battle to the next.
Some T-34 tanks are apparently still being used by some military forces even today, and the generations of Russian tanks developed since World War 2, which were produced in vast numbers during the cold war and still used by many armies, are direct descendants of the T-34, the best tank in World War 2.

sumber:2worldwar2.com

Minggu, 15 November 2009

C-47 Skytrain/Dakota



The DC-3 did not go unnoticed by one of Douglas's oldest customers -- the U.S. Army.
The military career of the Douglas DC series began in 1936 when the Army Air Corps ordered a pair of DC-2s under the designation C-32. A contract followed for 18 DC-2s in the C-33 freighter configuration and two more as C-34 staff transports. Then, in 1937, the Army ordered a plane built to its own specifications. It was a hybrid design that combined the fuselage of the DC-2 with a DC-3 tail. This was the sole C-38 prototype and it led to 35 production versions called the C-39. The C-39 represented the first serious effort by the Army to establish an airlift capability.
By 1941 the old Air Corps had been transformed into the Army Air Forces, and it selected a modified version of the DC-3 -- the C-47 Skytrain -- to become its standard transport aircraft. A reinforced fuselage floor and the addition of a large cargo door were the only major modifications. Other changes included the fitting of cargo hooks beneath the center wing section and the removal of the tail cone to mount a hook for towing gliders.
As a supply plane, the C-47 could carry up to 6,000 pounds of cargo. It could also hold a fully assembled jeep or a 37 mm cannon. As a troop transport, it carried 28 soldiers in full combat gear. As a medical airlift plane, it could accommodate 14 stretcher patients and three nurses. Seven basic versions were built, and the aircraft was given at least 22 designations, including the AC-47D gunship, the EC-47 electronic reconnaissance aircraft, the EC-47Q antiaircraft systems evaluation aircraft and the C-53 Skytrooper.
Every branch of the U.S military and all the major allied powers flew it. The U.S. Navy version was the R4D. The British and the Australians designated it the Dakota (a clever acronym composed of the letters DACoTA for Douglas Aircraft Company Transport Aircraft). The aircraft operated from every continent in the world and participated in every major battle. By the end of World War II, more than 10,000 had been built. For all of its official and unofficial names, it came to be known universally as the "Gooney Bird." General Dwight D. Eisenhower, Supreme Commander of Allied Forces in Europe, termed it one of the most vital pieces of military equipment used in winning the war.
C-47s remained in active military service long after the end of World War II. They played a critical role in the 1948 Berlin Airlift and saw action in the Korean and Vietnam wars.

Specifications
First flight: Dec. 23, 1941
Model Number: C-47/R4D
Wingspan: 95 feet 6 inches
Length: 63 feet 9 inches
Height: 17 feet
Service ceiling: 24,000 feet
Normal range: 1,600 miles
Maximum range: 3,800 miles
Weight: 31,000 pounds
Cruise speed: 160 mph
Power plant: Two 1,200 horsepower Pratt & Whitney R-1830 radial engines
Accommodation: Three crew and 6,000 pounds of cargo, or 28 airborne troops, or 14 stretcher patients and three attendants


sumber: www.boeing.com

Kamis, 29 Oktober 2009

u-47

U-47: Build Details and Technical Specifications

The following information covers the basic technical specifications of the Type VIIB U-boat in general, and U-47 in particular.




A. Build Details

Type: VIIB
Works: Krupp Germaniawerft, Kiel
Series: U45 - U55
Build Commissioned: 21.11.1936
Build Number: 538
Completed: 25.02.1937
First Launch: 29.10.1938
Handed over for Service: 17.12.1938
Field Post Number: 18837

B. Technical Specifications

Type VIIB Submarine
A side view of the Type VIIB U-Boat. The torpedo tubes are indicated in red.

Displacement:
Washington 517 metric tons
Surfaced (dry) 704 metric tons
Surfaced (fuel and water tanks full) 753 metric tons
Submerged 857 metric tons
Submerged (fully crewed and loaded) 1040 tons
Length:
Casing 66.5m (218.2')
Pressure hull 48.8m (160.1')
Beam:
Casing 6.2m (20.3')
Pressure hull 4.7m (15.4')
Draught:
4.7m (15.4')
Height:
9.5m (31.6')
Engines:
Two Germaniawerft 6-cylinder 4-stroke F46 diesels with superchargers totalling 2800 - 3200bhp
Motors:
Two AEG GU 460/8-276 electric motors totalling 750shp
Batteries:
Two rooms with 62 lead-acid AFA 27 MAK 800 battery cells producing 7500 amp hours
Fuel oil:
Maximum 108.3 metric tons
Normal load 99.7 metric tons (57.3 tons within pressure hull)
Speed:
Surfaced 17.2-17.9 knots
Submerged 8.0 knots
Range (surfaced):
3850nm at 17.2 knots
6500nm at 12 knots
8700nm at 10 knots
combined diesel/electric drive range 9400nm
Range (submerged):
90nm at 4 knots
Diving depth:
Operational - 100m (328')
Crush - 200m (656')
Maximum sustainable depth - c. 220m (733.3')
Diving time
30 seconds
Periscopes:
Sky - Standserohr C/2 with fixed eyepiece
Attack and night - Binokulare Nacht-Luftziel-Seerohr(NLSR)
Hydrophones:
Gruppenhorchgerat (GHG) (fixed hydrophone array) - 11 hydrophones per side, above forward dive planes
UWT:
Two underwater telephone membranes fitted on either side, above GHG (one for transmission and one for receipt of sound waves)
Armament:
» more info
88mm deck gun
20mm Flak gun
Torpedo tubes:
Bow - 4 x 21" (53.3cm) tubes
Stern - 1 x 21" (53.3cm) tube
Torpedo types:
» more info
G7a compressed air torpedo
G7e wakeless torpedo
Torpedo numbers:
Forward tubes - 4
Forward torpedo compartment - 6
Aft tube - 1
Aft torpedo compartment - 1
Between pressure hull and forward deck casing - 1
Between pressure hull and aft deck casing - 1
Total - 14. NB. Space was allocated in the deck casing for two additional torpedoes - one in the forward deck casing and one in the aft deck casing.
Mines
» more info
26 x TMA or 39 x TMB
Boats
1 dinghy, stored under forward casing forward of the torpedo loading hatch
Crew
December 1938 - 39
October 1939 - 40
February 1941 - 44