1 Operational history edit United States edit a flaming Marine ch-46 of hmm-265, after being hit by enemy aaa fire in "Helicopter Valley 10 Known colloquially as the "Phrog the sea knight was used in all. Marine operational environments between its introduction during the vietnam War and its frontline retirement in 2014. 11 The type's longevity and reputation for reliability led to mantras such as "phrogs phorever" and "never trust a helicopter under 30". 12 ch-46s transported personnel, evacuated wounded, supplied forward arming and refueling points (farp performed vertical replenishment, search and rescue, recovered downed aircraft and crews and other tasks. During the vietnam War, the ch-46 was one of the prime us troop transport helicopters in the theatre, slotting between the smaller Bell uh-1 Iroquois and larger sikorsky ch-53 sea stallion. During the 1972 Easter Offensive, sea knights saw heavy use to convey us and south vietnamese ground forces to and around the front lines. 13 ch-46 operations were plagued by major technical problems; the engines, being prone to foreign object damage (FOD) from debris being ingested when mba hovering close to the ground and subsequently suffering a compressor stall, had a lifespan as low as 85 flight hours; on, all.
Each of the rotors feature three blades, which can be folded to better facilitate storage and naval operations. 7 The ch-46 features a fixed tricycle landing gear, complete with twin wheels on all three legs of the landing gear; this configuration results in a nose-up stance, helping to facilitate cargo loading and unloading. Two of the main landing gear were installed within protruding rear sponsons ; the free interior space of the sponsons are also used to house fuel tanks, possessing a total capacity of 350 us gallons (1,438 L). 7 The interior of the ch-46 was largely taken up by its cargo bay, complete with a rear loading ramp that could be removed or left open in flight for the carriage of extended cargoes or for parachute drops. Various furnishings were normally provided to aid in its use as a utility rotorcraft, such as an internal winch mounted within the forward cabin, which can be used to assisting loading by pulling external cargo on pallets into the aircraft via the ramp and rollers. When operated in a typical configuration, the ch-46 would usually be operated by a crew of three; a larger crew could be accommodated when required, which would be dependent upon mission specifics. For example, a search and rescue (SAR) variant would usually carry a crew of five (Pilot, co-pilot, Crew Chief, Swimmer, and Medic) to facilitate all aspects of such operations. For self-defense, a pintle -mounted.50 in (12.7 mm) the Browning machine gun could be mounted on each side of the helicopter. 7 Service in southeast Asia resulted in the addition of armor along with the machine guns.
Citation needed The commercial variant, the bv 107-ii, was first ordered by new York airways during 1960. During July 1962, they took delivery of their first three aircraft, which was configured to seat up to 25 passengers., boeing Vertol sold the manufacturing rights of the 107 to japanese conglomerate kawasaki heavy industries. Under this arrangement, all Model 107 civilian and military aircraft built in Japan were referred to by the kv 107 designation. 5 On 15 December 2006, columbia helicopters, Inc acquired the type certificate for the bv 107-II; at the time, the company was reportedly in the process of acquiring a production Certificate from the federal aviation Administration (FAA). Plans for actual production of the aircraft were not announced. Marine watches two ch-46 sea knights, 2002 The boeing Vertol ch-46 sea knight is a medium-lift tandem-rotor transport helicopter, furnished with a set of counter-rotating main rotors in a tandem-rotor configuration. It was typically powered by a pair of General Electric T58 turboshaft engines, which were mounted on each side of the rear rotor pedestal; power to the forward rotor was transferred from the rear-mounted engines via a drive shaft. For redundancy, both engines are coupled so that either one would be capable of powering both of the main rotors in the event of a single engine failure or a similar emergency situation.
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Navy also acquired a small number of uh-46Ds for ship resupply purposes. 9 In addition, approximately 33 ch-46As were progressively re-manufactured to the ch-46D standard. 7 A door gunner manning a pintle-mounted.50-caliber M2 machine gun aboard a marine ch-46, august 201971, the. Marine corps received a number of ch-46F standard rotorcraft. This model retained the T58-ge-10 engines used on the ch-46D while featuring revised avionics and featured a number of other modifications.
The ch-46F was the final production model of the type. 1 During its service life, the sea knight received a variety of upgrades and modifications. Over time, the majority of the. Marine corps' sea knights were upgraded to the improved ch-46E standard. This model featured fiberglass rotor blades, reinforcement measures throughout the airframe, along with the refitting resume of further uprated T58-ge-16 engines, capable of producing 1,870 shp (1,390 kW) each; in addition, several ch-46Es were modified to double their maximum fuel capacity. 7 Starting in the mid-1990s, the dynamic Component Upgrade assistant (DCU) programmes was enacted, focusing on the implementation of strengthened drive systems and modified rotor controls.
Marine corps, where it was designated as the hrb-1., the. Air Force placed its own order for 12 xch-46b sea knight helicopters, which used the xh-49A designation; however, the service later decided to cancelled the order due to delays in its delivery; instead, the. Air Force opted to procure the rival sikorsky s-61R in its place. 6 Following the sea knight's first flight in August 1962, the military designation was changed to ch-46A. During november 1964, the introduction of the marines' ch-46A and the navy's uh-46As commenced. The uh-46a variant was a modified version of the rotorcraft to perform the vertical replenishment mission.
1 The ch-46A was equipped with a pair of T58-GE8-8B turboshaft engines, each being rated at 1,250 shp (930 kw these allowed the sea knight to carry up to 17 passengers or a maximum of 4,000 pounds (1,815 kg) of cargo. 7 Further developments edit during 1966, production of the improved ch-46D commenced with deliveries following shortly thereafter. This model featured various improvements, including modified rotor blades and the adoption of more powerful T58-ge-10 turboshaft engines, 1 rated at 1,400 shp (1,040 kW) each. The increased power of these new engines allowed the ch-46D to carry an increased payload, such as up to 25 troops or a maximum of 7,000 pounds (3,180 kg) of cargo. 7 During late 1967, the improved model was introduced to the vietnam theater, where it supplemented the. Marine corps' existing ch-46A fleet, which had proven to be relatively unreliable and problematic in service. 8 Along with the usmc's ch-46Ds, the.
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4 However, this order was later decreased to three helicopters; according to aviation author jay. Spenser, the cutback had been enacted in order that the. Army would be able to divert funds for the development of the rival V-114 helicopter, which was also a turbine-powered tandem rotor design but substantially larger than the v-107. 4 All of the. Army's three yhc-1As were powered by pairs of ge-t-58 engines. During August 1959, the first yhc-1A-model rotorcraft conducted its first flight; independently, it was shortly followed by the maiden flight of an improved model intended for the commercial and export markets, designated as the 107-ii., the. Marine corps evolved a requirement for a medium-lift, twin-turbine troop/cargo assault helicopter to replace the various piston-engined types that were then in widespread use with the service. 5 That same year, American aviation company boeing internet acquired Vertol, after which the group was consequently renamed boeing Vertol. 4 Following a competition between several competing designs, during early 1961, it was announced that boeing Vertol had been selected to manufacture its model 107M for the.
Contents development edit Origins edit during the 1940s and 1950s, American rotorcraft manufacturer piasecki helicopter emerged as a pioneering developer of tandem-rotor helicopters; perhaps the most famous of these being the piston-powered H-21 "Flying Banana an early utility and transport helicopter. During 1955, piasecki was officially renamed as Vertol (standing for vertical take-off and landing it was around this time that work commenced on the development of a new generation of tandem rotor helicopter. During 1956, the new design received the internal company designation of Vertol Model 107, or simply v-107 ; this rotorcraft differed from its predecessors by harnessing the newly developed turboshaft engine instead of piston-based counterparts. During that year, construction of a prototype, powered by a pair of Lycoming T53 turboshaft engines, each wind one being capable of producing 877 shp (640 kw commenced. 2 On, the v-107 prototype performed its maiden flight. 3 In order to garner publicity for the newly developed rotorcraft, it was decided to use the prototype to conduct a series of publicised flight demonstrations during a tour across the United States and several overseas nations. During June 1958, it was announced that the. Army had awarded a contract to vertol for the construction of ten production-standard aircraft based on the v-107, which were designated as the yhc-1A.
combat support, search and rescue (sar support for forward refueling and rearming points, casevac and Tactical Recovery of Aircraft and Personnel (trap). The sea knight also functioned as the. United States navy 's standard medium-lift utility helicopter prior to the type being phased out of service in favor of the mh-60S Knighthawk during the early 2000s. Several overseas operators acquired the rotorcraft as well. Canada operated the sea knight, designated as ch-113 ; the type was used predominantly in the search and rescue (SAR) role until 2004. Other export customers for the type included Japan, sweden, and saudi Arabia. The commercial version of the rotorcraft is the bv 107-ii, commonly referred to simply as the "Vertol".
On, the v-107 prototype performed its strange maiden flight. During June 1958, the. Army awarded a contract for the construction of ten production-standard aircraft, designated as the. Yhc-1a, based on the v-107; this initial order was later cut down to three yhc-1As though. Marine corps, who had been studying its requirements for a medium-lift, twin-turbine troop/cargo assault helicopter, selected boeing Vertol's model 107M as the basis from which to manufacture a suitable rotorcraft to meet their needs. Known colloquially as the "Phrog" and formally as the "sea knight it was operated across all. Marine corps' operational environments between its introduction during the. Vietnam War and its frontline retirement during 2014. The sea knight was operated by the.
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"sea knight" redirects here. For the mythological creature also named sea knight, see. The, boeing Vertol ch-46 sea knight is a medium-lift tandem-rotor transport helicopter powered essay by twin turboshaft engines. It was designed by, vertol and manufactured. Boeing Vertol following Vertol's acquisition by, boeing. Development of the sea knight, which was originally designated by the firm as the. Vertol Model 107, commenced during 1956. It was envisioned as a successor to the first generation of rotorcraft, such as the. H-21 "Flying Banana that had been powered by piston engines ; in its place, the, v-107 made use of the emergent turboshaft engine.