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Piasecki PA-97 Helistat
The Piasecki PA-97 Helistat was an American experimental heavy-lift aircraft, built by Piasecki by fastening four H-34J helicopters to a framework beneath a helium-inflated blimp envelope. The sole prototype was lost during a test flight, killing a test pilot and injuring another four in the course of a single incident. Design and development Helistat design concept The Helistat concept was to augment the helicopters' dynamic lift with the static lift of an air buoyancy envelope. This would give greater maximum lift capability for heavy-lift work. At low weights (i.e. traveling to site without a payload) it would also free up the helicopters' rotor thrust for forward thrust, requiring less dynamic lift and lower fuel burn. To maintain coincidence of the dynamic and static lifts (otherwise the envelope would pitch as helicopter power increased), it is impractical to use a single helicopter rotor, so multiple rotors are arranged around the center of buoyancy of the envelope. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piasecki Aircraft
The Piasecki Aircraft Corporation (PiAC) is a manufacturing, manufacturer of aircraft, principally advanced rotorcraft. It was founded by American vertical flight pioneer Frank Piasecki to develop compound helicopters and other advanced rotorcraft after he was ousted from the leadership of his first company, Piasecki Helicopter.Trimble 1982, pp. 257–258. History The company's origins dated back to 1936 with the formation of the P-V Engineering Forum in 1940 and it was renamed the Piasecki Helicopter Corporation in 1946. After a falling out with other owners, Frank Piasecki and some of his design team left to form Piasecki Aircraft Corporation in 1955. The Piasecki Aircraft Corporation is based in Essington, Pennsylvania and is run by Frank Piasecki's sons; Frederick Weyerhaeuser Piasecki is chairman and John Weyerhaeuser Piasecki is president and CEO. In 2005, the company was selected by the United States Army as the prime contractor for two Future Combat Systems (FCS) unman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AeroLift CycloCrane
The AeroLift CycloCrane was a unique US hybrid airship which adopted helicopter derived airfoil control for low speed flight manoeuvring by spinning on its axis. It was intended to be a heavy load lifter, initially aimed at the Canadian logging industry. A proof of concept vehicle flew at times during the 1980s, but no large production aircraft were built. Design and development AeroLift Inc was set up in 1980 by CycloCrane inventor Arthur Crimmins, with funding from five major Canadian logging companies, with the objective of building a hybrid airship capable of conducting aerial logging at remote sites inaccessible by conventional means. The CycloCrane was a most unusual aircraft, utterly unique in its method of three-dimensional drive and attitude control. Two proof of concept versions were built, identical in size and varying in some details. Each had a fabric, oblate spheroid gas bag, or aerostat, to provide aerostatic lift sufficient to support the aircraft and fift ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1980s United States Helicopters
__NOTOC__ Year 198 (CXCVIII) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Sergius and Gallus (or, less frequently, year 951 ''Ab urbe condita''). The denomination 198 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire *January 28 **Publius Septimius Geta, son of Septimius Severus, receives the title of Caesar. **Caracalla, son of Septimius Severus, is given the title of Augustus. China *Winter – Battle of Xiapi: The allied armies led by Cao Cao and Liu Bei defeat Lü Bu; afterward Cao Cao has him executed. By topic Religion * Marcus I succeeds Olympianus as Patriarch of Constantinople (until 211). Births * Lu Kai, Chinese official and general (d. 269) * Quan Cong, Chinese general and advisor (d. 249) Deaths * Li Jue, Chinese warlord and regen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cancelled Military Aircraft Projects Of The United States
Cancel, cancellation, or cancelled may refer to: Business *Project cancellation, in government and industry *Cancellation (mail), a postal marking applied to a stamp or stationery indicating the item has been used *Cancellation (insurance), the termination of an insurance policy *Flight cancellation and delay, not operating a scheduled flight Sociology *Cancel culture, boycotting and ostracism calling out offensive behavior on social media or in real life Technology and science *Cancel leaf, a bibliographic term for replaced leaves in printed books *Cancellation property, the mathematical property if ''a''×''b'' = ''a''×''c'' then ''b'' = ''c'' ** Cancelling out, a technique for simplifying mathematical expressions *Catastrophic cancellation, numerical error arising from subtracting approximations to nearby numbers * Noise cancellation, a method for reducing unwanted sound *Phase cancellation, the effect of two waves that are out of phase with each other being summed *Ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piasecki Aircraft
The Piasecki Aircraft Corporation (PiAC) is a manufacturing, manufacturer of aircraft, principally advanced rotorcraft. It was founded by American vertical flight pioneer Frank Piasecki to develop compound helicopters and other advanced rotorcraft after he was ousted from the leadership of his first company, Piasecki Helicopter.Trimble 1982, pp. 257–258. History The company's origins dated back to 1936 with the formation of the P-V Engineering Forum in 1940 and it was renamed the Piasecki Helicopter Corporation in 1946. After a falling out with other owners, Frank Piasecki and some of his design team left to form Piasecki Aircraft Corporation in 1955. The Piasecki Aircraft Corporation is based in Essington, Pennsylvania and is run by Frank Piasecki's sons; Frederick Weyerhaeuser Piasecki is chairman and John Weyerhaeuser Piasecki is president and CEO. In 2005, the company was selected by the United States Army as the prime contractor for two Future Combat Systems (FCS) unman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airships Of The United States
An airship, dirigible balloon or dirigible is a type of aerostat (lighter-than-air) aircraft that can navigate through the air flying powered aircraft, under its own power. Aerostats use buoyancy from a lifting gas that is less dense than the surrounding air to achieve the lift (physics), lift needed to stay airborne. In early dirigibles, the lifting gas used was hydrogen gas, hydrogen, due to its high lifting capacity and ready availability, but the inherent flammability led to several fatal accidents that rendered hydrogen airships obsolete. The alternative lifting gas, helium gas is not flammable, but is rare and relatively expensive. Significant amounts were first discovered in the United States and for a while helium was only available for airship usage in North America. Most airships built since the 1960s have used helium, though some have used thermal airship, hot air. The envelope of an airship may form the gasbag, or it may contain a number of gas-filled cells. An air ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1980s United States Experimental Aircraft
__NOTOC__ Year 198 (CXCVIII) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Sergius and Gallus (or, less frequently, year 951 ''Ab urbe condita''). The denomination 198 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire *January 28 **Publius Septimius Geta, son of Septimius Severus, receives the title of Caesar. **Caracalla, son of Septimius Severus, is given the title of Augustus. China *Winter – Battle of Xiapi: The allied armies led by Cao Cao and Liu Bei defeat Lü Bu; afterward Cao Cao has him executed. By topic Religion * Marcus I succeeds Olympianus as Patriarch of Constantinople (until 211). Births * Lu Kai, Chinese official and general (d. 269) * Quan Cong, Chinese general and advisor (d. 249) Deaths * Li Jue, Chinese warlord and regent * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forest History Society
The Forest History Society is an American non-profit organization dedicated to the preservation of forest and conservation history."Forest History Society." Echo Project. Center for History and New Media, George Mason University. http://echo.gmu.edu/node/144 The society was established in 1946 and incorporated in 1955. The Forest History Society headquarters in Durham, North Carolina, include the Alvin J. Huss Archives and the Carl A. Weyerhaeuser Library, which combine to provide a comprehensive compilation of materials related to the topic of forest history. The archives house large collections from several national organizations and companies such as the Society of American Foresters, the American Forest and Paper Association, the American Forestry Association, the American Tree Farm System, and the Weyerhaeuser Company as well as many other smaller collections of national and international significance. Additionally, the Forest History Society maintains a publication pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Airship Accidents ...
The following is a partial list of airship accidents. It includes both rigid airships and blimps, which operated differently from one another. Not included on this list are airships shot down or otherwise lost to military action. See also * List of ballooning accidents References {{DEFAULTSORT:List of Airship Accidents *Airships Airship Accidents Airships An airship, dirigible balloon or dirigible is a type of aerostat (lighter-than-air) aircraft that can navigate through the air flying under its own power. Aerostats use buoyancy from a lifting gas that is less dense than the surrounding ai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SkyHook JHL-40
The SkyHook JHL-40 was a proposed hybrid airship/helicopter. On July 9, 2008, Boeing announced that it had teamed up with SkyHook International, a Canada, Canadian company, to develop this aircraft. No further press releases appear after 2009 and Skyhook International has abandoned its domain name registration since 2010 as shown by the Internet Archive. According to company spokespeople, the aircraft would combine the best features of a blimp and a helicopter, and would be capable of carrying a 40 ton load up to without refueling. At long, it would classify as the largest helicopter in the world, and would be capable of flying up to without a load. The craft would use helium to provide enough lift to neutral buoyancy, carry its own weight, and would use four helicopter rotors to lift the load and to propel the aircraft. By using both helium and helicopter rotors, the aircraft can avoid having to jettison helium after unloading. In comparison, the CH-47 Chinook helicopter can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
