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Miller twist rule is a mathematical formula derived by American physical chemist and historian of science Donald G. Miller (1927-2012) to determine the rate of twist to apply to a given bullet to provide optimum stability using a rifled barrel. [1]
Name First elements Short description OEIS Mersenne prime exponents : 2, 3, 5, 7, 13, 17, 19, 31, 61, 89, ... Primes p such that 2 p − 1 is prime.: A000043 ...
Lucas numbers have L 1 = 1, L 2 = 3, and L n = L n−1 + L n−2. Primefree sequences use the Fibonacci recursion with other starting points to generate sequences in which all numbers are composite. Letting a number be a linear function (other than the sum) of the 2 preceding numbers. The Pell numbers have P n = 2P n−1 + P n−2.
The 6.5 Grendel is a 6.5 mm rifle cartridge developed by the small arms company, Alexander Arms, to serve as an intermediate power round, falling somewhere between the 5.56×45mm NATO and 7.62×51mm NATO. They also have a correlative round that is much more powerful, the .50 Beowulf
For instance, with a velocity of 600 m/s (2000 ft/s), a diameter of 0.5 inches (13 mm) and a length of 1.5 inches (38 mm), the Greenhill formula would give a value of 25, which means 1 turn in 25 inches (640 mm). Recently, Greenhill formula has been supplemented with Miller twist rule.
Grendel is a figure in the poem Beowulf, preserved in the Nowell Codex. [2] Grendel, being cursed as the descendant of the Biblical Cain, along with elves and other eotens, is "harrowed" by the sounds of singing that come every night from the mead hall of Heorot built by King Hroðgar. Unable to bear it any more, he attacks Heorot.
The case head diameter of the Grendel is the same as that of the 5.6×39mm (.220 Russian), 7.62×39mm and 6.5mm PPC cases. This diameter is larger than the 5.56×45mm NATO , thereby necessitating the use of a non-standard AR-15 bolt .
Grendel and "Grendel's ma" or "Grendel's mum" are also characters in Suniti Namjoshi's 1993 postmodern collection of feminist fairytales, St Suniti and the Dragon. [4] Consisting of non-sequential poetry and prose, St Suniti and the Dragon focuses on the adventures of St. Suniti, a female saint-in-training. During these adventures, St. Suniti ...