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Conventional eight groove rifling on the left, and octagonal polygonal rifling on the right. Polygonal rifling (/ p ə ˈ l ɪ ɡ ə n əl / pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile.
The 2.0 L (1,994 cc) 5R family was produced from 1968 through 1986. An LPG version, the 5R-LPG, was produced from 1968 through 1983. It is a 2-valve OHV engine. Cylinder bore and stroke are 88 mm × 82 mm (3.46 in × 3.23 in). Output was 79 kW (106 hp; 107 PS) at 5200 rpm and 169 N⋅m (125 lb⋅ft) at 3000 rpm.
Rifling of a 105 mm Royal Ordnance L7 tank gun Conventional rifling of a 90 mm M75 cannon (production year 1891, Austria-Hungary) Rifling in a GAU-8 autocannon. Rifling is the term for helical grooves machined into the internal surface of a firearms's barrel for imparting a spin to a projectile to improve its aerodynamic stability and accuracy.
Another issue that has an effect on the barrel's hold on the bullet is the rifling. When the bullet is fired, it is forced into the rifling, which cuts or "engraves" the surface of the bullet. If the rifling is a constant twist, then the rifling rides in the grooves engraved in the bullet, and everything is secure and sealed.
Although Mazda is well known for their Wankel "rotary" engines, the company has been manufacturing piston engines since the earliest years of the Toyo Kogyo company. Early on, they produced overhead camshaft, aluminum blocks, and an innovative block containing both the engine and transmission in one unit.
The engine was mated to a 4-speed automatic transmission or 5-speed manual transmission, the latter of which was not available in the United States. The T-5R was renowned as a sleeper car; despite its boxy, understated appearance, it boasted a drag coefficient of 0.29 and was capable of accelerating from 0 to 60 mph (97 km/h) in 6.8 - 7.0 ...
In declining to step aside from two high-profile Supreme Court cases, Justice Samuel Alito on Wednesday provided a rare window on the opaque process by which justices decide to step aside from cases.
SAAMI recommends a barrel with a 6 groove contour and a twist rate of one revolution every 9 in (229 mm) with each groove having a width of .095 in (2.41 mm). The recommended bore diameter is .256 in (6.50 mm) and the groove diameter is .264 in (6.71 mm). SAAMI recommends that rifling commence at .221 in (5.61 mm) from the chamber mouth.