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18-592: For the Portuguese name, see Hélio . Helio may refer to: Helio AU-24 Stallion Helio (wireless carrier) , a defunct American wireless communications provider (2005–2010); originally a joint venture between SK Telecom and EarthLink, purchased by Virgin Mobile USA in 2008 Helio (Cambridge Glass) , a short-lived glassware range Helio Aircraft Company , an aircraft manufacturing company Helio Courier ,

36-586: A completely new design of the same general configuration and much of its design was initiated from components used in the Helio H-500 Twin. It was a much larger aircraft than the Courier, and Helio soon discovered that it was too expensive for the market. The United States Air Force (USAF) however, emerged as a buyer for the design, purchasing the aircraft for the Credible Chase programme as

54-660: A light C/STOL utility aircraft designed in 1949 Technology [ edit ] Helio, a series of mobile CPU and GPU developed by MediaTek . People [ edit ] Helio Castro (born 1917), Salvadoran former sports shooter. Helio Fallas Venegas (born 1947), Costa Rica economist and politician. Helio Gallardo , Chilean Philosopher and Professor of the University of Costa Rica . Helio Koa'eloa (ca. 1815–1846), Hawaiian Catholic lay missionary . Helio Vera (1946–2008), Paraguayan writer, lawyer and journalist. See also [ edit ] Hélio ,

72-559: A surname (including a list of people with the name) Helios (disambiguation) Elio (disambiguation) Heliocentrism Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Helio . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Helio&oldid=1193372470 " Category : Disambiguation pages Hidden categories: Short description

90-521: Is a 20 mm three-barreled electric Gatling-type rotary cannon used by the United States military . The M197 electric cannon was developed primarily for use by United States Army helicopter gunships . Development began in 1967 after experience in the Vietnam War revealed the inadequacy of the 7.62 mm Minigun for gunship use. The M197 is essentially a lightened version of

108-511: Is also mounted as a chin turret in South Korea's KAI LAH helicopter. The M197 was also mounted into the AU-23A as a handheld Door gun . The XM301 was an improved M197 intended to be the gun on the later canceled RAH-66 Comanche . The weapon's current contractor is General Dynamics Armament Systems . Iran has claimed downing one Iraqi MiG-21 fighter on 14 February 1986 during

126-659: Is different from Wikidata All article disambiguation pages All disambiguation pages Helio AU-24 Stallion The Helio HST-550 Stallion was an STOL utility aircraft developed in the United States in 1963, with the first prototype flying in July 1964. Initially conceived by the Helio Aircraft Company as a turboprop-powered variant of the Helio Courier , it eventually emerged as

144-509: Is to fire the cannon in 30- to 50-round bursts. With extended automatic firing from a hover, the recoil is sufficient that the application of forward cyclic to maintain one's position over the ground is inadequate. The M197 remains in use in the latest AH-1W Cobra and AH-1Z Viper gunships. Although the weapon's rotary drive is theoretically quite reliable, its ammunition feed has been anything but: Marine pilots initially reported an alarmingly high jam rate (sometimes greater than 30%). The USMC and

162-643: The AU-24A . This was the gunship version of the Stallion, with a PT6A-27 680 shp (510 kW) turboprop, equipped with an M197 three-barrel 20x102mm rotary cannon mounted in the left cargo door. It also had five underwing and fuselage hardpoints. Of the 18 aircraft purchased by the USAF, fourteen or fifteen were eventually delivered to the Khmer Air Force (KAF) between January and November 1972 under

180-780: The Air Force of the Kampuchea Liberation Army (AFKLA) of the new Democratic Kampuchea Regime, although poor maintenance and a chronic shortage of spare parts ensured that only one of these machines was still airworthy when the AFKLA was neutralized by the People's Army of Vietnam in February 1979 during the Cambodian–Vietnamese War . This remaining Stallion was subsequently taken after 1979 into service of

198-642: The General Electric M61 Vulcan cannon, with three barrels instead of six. Its maximum rate of fire is one quarter that of the Vulcan, largely to limit its recoil for light aircraft and helicopter use. It shares the Vulcan's M50 and PGU series 20 mm ammunition . The M197 went into service on later marks of the AH-1 Cobra , using either the M97 or A/A49E-7 armament subsystems, and

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216-618: The Foreign Military Sales program for use in border surveillance and counter-infiltration roles, where the threat of encountering anti-aircraft fire (other than small arms) was minimal. An important addition to the KAF, the AU-24A mini-gunships were assigned to a newly raised Mini-gunship Squadron ( French : Escadron AU-24 ) stationed at Pochentong Air Base near Phnom Penh , which broadened supply convoy escort operations on

234-538: The air force component of the Kampuchean People's Revolutionary Armed Forces (KPRAF; later, CPAF), remaining operational until 1993, when was finally decommissioned. Data from Jane's All The World's Aircraft 1976–77 General characteristics Performance Aircraft of comparable role, configuration, and era [REDACTED] Media related to Helio AU-24 Stallion at Wikimedia Commons M197 electric cannon The M197 electric cannon

252-591: The entire mini-gunship fleet. In the final months of the Cambodian Civil War , the KAF employed their AU-24A mini-gunships in night bombing operations against entrenched Khmer Rouge 107mm rocket positions north of Phnom Penh, but after virtually expended their entire ordnance reserves, three Stallions escaped on April 16–17, 1975 from Pochentong Air Base flown by their respective crews to safe haven in neighbouring Thailand . The Khmer Rouge did manage though to salvage intact nine AU-24A mini-gunships for

270-536: The lower Mekong - Bassac Rivers corridors. Such operations had been carried out in conjunction with the Khmer National Navy (MNK) since mid-1971, when the KAF began to provide air cover to MNK convoys with their Douglas AC-47D Spooky gunships. Under Project Flycatcher , an improvement programme for the KAF, the Americans delivered among other aircraft types a single AU-24A mini-gunship before

288-570: The manufacturer are aware of the problem and in 2011 a linkless feed system developed by Meggit Defense Systems was incorporated into the AH-1W and the Zulus. The system is capable of holding 650 +/-3 rounds in the storage unit with approximately 40 rounds in the feed chute. The M197 is also mounted as a chin turret in Italy's Agusta A129 Mangusta CBT helicopter, with a capacity of 500 rounds. The M197

306-467: The programme was officially terminated on June 30, 1973. Although the AU-24A mini-gunships delivered to Cambodia acquainted themselves well in the river convoy escort role, they were found to be beset with a long list of technical faults, which became painfully clear on August 10, 1973, after a Stallion crashed on a rocket pass, killing its crew and forced the KAF Air Command to temporarily ground

324-569: Was also fitted in a ventral turret on the U.S. Marine Corps YOV-10D Bronco NOGS . It is also the basis of the GPU-2/A gun pod , which incorporates the cannon, a battery and electric drive motor , and 300 rounds of linkless ammunition. In the Cobra, the weapon is supplied with a magazine of 700 linked rounds, with a total capacity including feeder system of 750 rounds. It has a cyclic rate of fire of 730+-50 rounds per minute. Standard practice

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