The Douglas A-3“Skywarrior”was a strategic nuclear bomber developed for the US Navy. The aircraft had a largely conventional semi- monocoque fuselage, with two J57 turbojet engines in underwing nacelles, A-3's wings can be folded for storage below deck, radar-controlled tail turret and a crew of three. The A-3 Skywarrior project started in 1947,The prototype XA3D-1 first flew on 28 October 1952, entered service with the Navy Heavy Attack Squadron One in 1956.Production ended in 1961. Douglas total built 282 Skywarriors.
The Chengdu J-10B is the multi-role fighter developed from the J-10A Vigorous Dragon.The prototype took the first flight in December,2008.Now the J-10B has been put into production.
The J-10B made a lot of changes such like the DIS air intake,the new vertical tail antenna and some latest avionics which cann’t be identified from the appearance.
Different from the prototype,the production J-10B updated the avionics,some antennas were added.The first production J-10B are now in test and soon will be put into service.
The Panzerkampfwagen IV (Pz.Kpfw. IV) Sd Kfz 161, commonly known as the Panzer IV, was a medium tank developed in Nazi Germany in the late 1930s and used extensively during the Second World War. Its ordnance inventory designation was Sd.Kfz. 161.
Designed as an infantry-support tank, the Panzer IV was not originally intended to engage enemy armour—that function was performed by the lighter Panzer III. However, with the flaws of pre-war doctrine becoming apparent, and in the face of Soviet T-34 tanks, the Panzer IV soon assumed the tank-fighting role of its increasingly obsolete cousin. The most widely manufactured and deployed German tank of the Second World War, the Panzer IV was used as the base for many other fighting vehicles, including the Sturmgeschütz IV tank destroyer, the Wirbelwind self-propelled anti-aircraft weapon, and the Brummbär self-propelled gun, amongst others.
The Saint-Chamond was the second French heavy tank of the First World War, with 400 manufactured from April 1917 to July 1918. Born of the commercial rivalry between the makers of the Schneider CA1 tank, the Saint-Chamond was an inadequate design. Its principal weakness was the "caterpillar" tracks . They were much too short in relation to the vehicle's length and heavy weight ( 23 tons ). Later models, however, attempted to rectify some of the tank's original flaws by installing wider and stronger track shoes, thicker frontal armor and the more effective 75mm Mle 1897 field gun. The Saint-Chamond tanks remained engaged in various actions until the late summer of 1918, belatedly becoming more effective after combat had moved out of the trenches onto open ground . Eventually, however, the Saint-Chamond tanks were scheduled to be entirely replaced by imported British heavy tanks.
The Messerschmitt Me262 was the first jet fighter in the world. Project work had begun at Messerschmitt as early as April 1939 on a new high-speed fighter plane the propulsion of which was to consist of the “turbine jet” system. And on 18 th July 1942 the Me262 took off on his first flight. The Me262 was powered by two Jumo 004B type engines giving the Me262 amaximum speed of870km/hat an altitude of6000m. Its service ceiling was11400mand its range was 1050km. Basic armament consists of 4 × 30mm MK108 cannon installed in the nose. In addition, 2 × 12 type R4Mrockets could be carried the wings.
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