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On 26 July 2021 (UTC), Japan's space agency JAXA successfully tested a pulse detonation rocket engine in space on a S-520 sounding rocket flight. [9] The upper stage of the rocket used a rotating detonation engine (RDE) as the main engine and a S-shaped pulse detonating engine was used to de-spin the stage after the main engine burn. PDE ...
From No. 941 the final assembly took place at the Gia Lâm works of Vietnam Railways. No. 981 to 1000 (built 2024–2025) which uses the 16V280ZJG engine (4,000 kW or 5,400 hp), Nevertheless, the design mirrors in part the modular concept found From CRRC other locomotives (the HXD1D HXD3D and DF11G and DF8B ).
Vietnam has purchased three CASA C-212 Aviocar Series 400 aircraft. The aircraft are equipped with MSS 6000 radar and the Naval Air Force will use them for general patrol purposes. Vietnamese Navy received two Eurocopter EC225 Super Puma to offshore patrol and search and rescue missions. [98]
In 2020, Vietnam and South Korea entered negotiations for the delivery of the South Korean SSE-750K turbojet engines to Vietnam, presumably for the VCM-01 project. This is the engine used in South Korea's SSM-710K Haeseong anti-ship missile , as well as its tactical land-attack variant SSM-750K Sea Dragon.
The CBU-55 was a cluster bomb fuel–air explosive that was developed during the Vietnam War by the United States Air Force, and was used only infrequently in that conflict. . Unlike most incendiaries, which contained napalm or phosphorus, the 750-pound (340 kg) CBU-55 was fueled primarily by propa
In spark-ignition internal combustion engines, knocking (also knock, detonation, spark knock, pinging or pinking) occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but when one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.
Unintentional detonation when deflagration is desired is a problem in some devices. In Otto cycle, or gasoline engines it is called engine knocking or pinging, and it causes a loss of power. It can also cause excessive heating, and harsh mechanical shock that can result in eventual engine failure. [29]
This engine produced 4,000 lbf (18 kN) of thrust. NASA has stated their intention to create a 10,000-pound-force (44 kN) thrust unit as the next research step. [17] On December 20, 2023, a full-scale Rotating Detonation Rocket Engine combustor was reportedly fired for 251 seconds, achieving more than 5,800-pound-force (26 kN) of thrust.