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Ukrainian KrAZ Spartan with RK-3 Corsar ATGM installed, [9] during a practice for the parade dedicated to the 23rd Independence Day of Ukraine (Kyiv, Ukraine). Ukraine's state-owned defense contractor State Kyiv Design Bureau, Luch started the project in the early 2000s.
PJSC Mayak modifies the grenade [7] into the RKG 1600 by changing the fuze timing and adding 3D printed fins to stabilise its trajectory when dropped from a commercial drone. [8] Footage of these being used by Ukrainian forces against Russian forces has been published officially. [9] [10] The estimated total cost is "less than $100". [11]
Apeks equipment is used by several militaries and emergency services, including the Royal Navy. [2] The company was founded in 1974 by Ken Ainscough and Eric Partington, with its name being an anagram of their initials. [2] In 1997, the company was acquired by the Aqualung Group, which at the time was called Aqua Lung International. [3]
Grid fins have a much shorter chord (the distance between leading and trailing edge of the surface) than planar fins, as they are effectively a group of short fins mounted parallel to one another. Their reduced chord reduces the amount of torque exerted on the steering mechanism by high-speed airflow, allowing for the use of smaller fin ...
This is a fin stroke for maintaining position and attitude at the surface, particularly while waiting for a pickup or taking a compass bearing. The fins are sculled from side to side using opening and closing motions of the legs, and the ankles rotated as best suited to the thrust needed to turn or hold the diver steady.
This is the ratio of the fin heat transfer rate to the heat transfer rate of the fin if the entire fin were at the base temperature, = ˙. in this equation is equal to the surface area of the fin. The fin efficiency will always be less than one, as assuming the temperature throughout the fin is at the base temperature would increase the heat ...