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Sikorsky S-69

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The Sikorsky S-69 (military designation XH-59) is an experimental co-axial compound helicopter developed by Sikorsky Aircraft as the demonstrator of the Advancing Blade Concept (ABC) under US Army and NASA funding. [1]

28 relations: Autorotation, Coaxial rotors, Density altitude, Flightglobal, Future Vertical Lift, G-force, General Electric T700, Gyrodyne, Helicopter, IEEE Spectrum, List of rotorcraft, NASA, Popular Mechanics, Popular Science, Pratt & Whitney Canada PT6T, Pratt & Whitney JT12, Retreating blade stall, Sikorsky Aircraft, Sikorsky S-72, Sikorsky S-97 Raider, Sikorsky X2, Slowed rotor, STOL, Turbojet, Turboshaft, United States, United States Army, United States Army Research Laboratory.


Autorotation is a state of flight in which the main rotor system of a helicopter or similar aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor.

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Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.

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Christmas and holiday season

The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.

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Christmas Eve

Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.

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Christmas traditions

Christmas traditions vary from country to country.

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Coaxial rotors

Coaxial rotors or "coax rotors" are a pair of helicopter rotors mounted one above the other on concentric shafts, with the same axis of rotation, but turning in opposite directions (contra-rotation).

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Density altitude

The density altitude is the altitude relative to standard atmospheric conditions at which the air density would be equal to the indicated air density at the place of observation.

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Flightglobal is an online news and information website which covers the aviation and aerospace industries.

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Future Vertical Lift

Future Vertical Lift (FVL) is a plan to develop a family of military helicopters for the United States Armed Forces.

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The gravitational force, or more commonly, g-force, is a measurement of the type of acceleration that causes a perception of weight.

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General Electric T700

The General Electric T700 and CT7 are a family of turboshaft and turboprop engines in the class.

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A gyrodyne is a type of VTOL aircraft with a helicopter rotor-like system that is driven by its engine for takeoff and landing and also includes one or more conventional propellers to provide forward thrust during cruising flight.

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A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors.

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IEEE Spectrum

IEEE Spectrum is a magazine edited by the Institute of Electrical and Electronics Engineers.

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List of rotorcraft

This is a list of rotorcraft, including helicopters, autogyros, rotor kites and convertiplanes.

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The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.

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New Year

New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.

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New Year's Day

New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.

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New Year's Eve

In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.

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Popular Mechanics

Popular Mechanics is a classic magazine of popular science and technology.

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Popular Science

Popular Science (also known as PopSci) is an American quarterly magazine carrying popular science content, which refers to articles for the general reader on science and technology subjects.

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Pratt & Whitney Canada PT6T

The Pratt & Whitney Canada PT6T Twin-Pac is a turboshaft engine designed for helicopters.

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Pratt & Whitney JT12

The Pratt & Whitney JT12, (US military designation J60) is a small turbojet engine.

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Retreating blade stall

Retreating blade stall is a hazardous flight condition in helicopters and other rotary wing aircraft, where the rotor blade with the smaller resultant relative wind exceeds the critical angle.

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Sikorsky Aircraft

The Sikorsky Aircraft Corporation is an American aircraft manufacturer based in Stratford, Connecticut.

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Sikorsky S-72

The Sikorsky S-72 was an experimental hybrid helicopter/fixed-wing aircraft developed by helicopter manufacturer Sikorsky Aircraft.

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Sikorsky S-97 Raider

The Sikorsky S-97 Raider is a proposed high-speed scout and attack compound helicopter based on the Advancing Blade Concept (ABC), under development by Sikorsky Aircraft.

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Sikorsky X2

The Sikorsky X2 is an experimental high-speed compound helicopter with coaxial rotors developed by Sikorsky Aircraft.

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Slowed rotor

Slowed rotor is a concept in designing and flying certain rotorcraft.

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STOL is an acronym for a short takeoff and landing aircraft, which have short runway requirements for takeoff and landing.

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The turbojet is an airbreathing jet engine, typically used in aircraft.

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A turboshaft engine is a form of gas turbine that is optimized to produce shaft power rather than jet thrust.

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United States

The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.

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United States Army

The United States Army (USA) is the land warfare service branch of the United States Armed Forces.

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United States Army Research Laboratory

The Army Research Laboratory (ARL) is the U.S. Army's corporate research laboratory.

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2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.

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2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.

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Redirects here:

Sikorsky H-59, Sikorsky XH-59, XH-59A.


[1] https://en.wikipedia.org/wiki/Sikorsky_S-69

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