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Vortex Optics is a DBA of Sheltered Wings, Inc., which was incorporated in Wisconsin in 1989. Sheltered Wings, Inc. DBA Vortex Optics began in 2002. In 2022 after extensive research, testing and reviews Vortex became an official supplier and contractor to the American Military as the U.S. Army selected Vortex‘s XM-157 fire control system for its Next Generation Squad Weapon program.
Leupold & Stevens, Inc. is an American manufacturer of telescopic sights, red dot sights, binoculars, rangefinders, spotting scopes, and eyewear located in Beaverton, Oregon, United States. The company, started in 1907, is on its fifth generation of family ownership.
The Strouhal number depends on the Reynolds number, [5] but a value of 0.22 is commonly used. [6] As the unit is dimensionless, any set of units can be used for the variables. Over four orders of magnitude in Reynolds number, from 10 2 to 10 5, the Strouhal number varies only between 0.18 and 0.22. [5]
The Bell AH-1Z Viper [3] is a twin-engine attack helicopter, based on the AH-1W SuperCobra, designed and produced by the American aerospace manufacturer Bell Helicopter. It is one of the latest members of the prolific Bell Huey family. It is often called "Zulu Cobra", based on the military phonetic alphabet pronunciation of its variant letter.
The Thomson Viper FilmStream Camera is a digital movie camera produced by Thomson Multimedia (now Vantiva). Introduced in the early 2000s [ 1 ] as makers of feature films were turning to digital cinematography , the Viper influenced subsequent HD , UHD, and HDR cameras.
"The Mountain and the Viper" is the eighth episode of the fourth season of HBO's medieval fantasy television series Game of Thrones. The 38th episode overall, it was written by series co-creators David Benioff and D. B. Weiss, and directed by Alex Graves. [1] It first aired on HBO on June 1, 2014. [2]
The Tomark Viper SD4 is a Slovak single–engine, all-metal, two-seat low wing monoplane with a fixed tricycle undercarriage and side-by-side seating for two people. The aircraft is built by Tomark s.r.o. of Prešov .
The Vortex lattice method, (VLM), is a numerical method used in computational fluid dynamics, mainly in the early stages of aircraft design and in aerodynamic education at university level. The VLM models the lifting surfaces, such as a wing , of an aircraft as an infinitely thin sheet of discrete vortices to compute lift and induced drag .