Musée de l'Informatique - Grande Arche Paris La Défense - A. Torotrak's bookmarks on del.icio.us. Moteur a eau system pentone environnement. Auto-innovations : La suspension – liaisons au sol. Ramjet. Simple ramjet operation, with Mach numbers of flow shown A ramjet, sometimes referred to as a flying stovepipe, or an athodyd which is an abbreviation of Aero thermodynamic duct, is a form of airbreathing jet engine using the engine's forward motion to compress incoming air, without a rotary compressor. Ramjets cannot produce thrust at zero airspeed, thus they cannot move an aircraft from a standstill. Ramjets therefore require assisted take off like JATO to accelerate it to a speed where it begins to produce thrust. Ramjets work most efficiently at supersonic speeds around Mach 3.
This type of engine can operate up to speeds of Mach 6. Ramjets can be particularly useful in applications requiring a small and simple mechanism for high-speed use, such as missiles or artillery shells. Ramjets are frequently confused with pulsejets, which use an intermittent combustion, but ramjets employ a continuous combustion process. History[edit] Cyrano de Bergerac[edit] René Lorin[edit] Albert Fonó[edit] History and technical specifications of Djinn. History and use Developed by the Société Nationale de Construction Aéronautique du Sud-Ouest, the Djinn flight first time in the shape of a single-seat helicopter, January 2, 1953. Thereafter, a two-seat version was developed and built in series. This rotorcraft uses an operating mode very different from traditional helicopters : the main rotor is not pulled by a mechanical force of a turbine, but by the reaction produced by the ejection of compressed air in blade tip.
This process, which does not induce couple effect due to the force exerted on the rotor, makes it possible not to use a tail rotor. The Djinn was the only machine with reaction in the world to be serial built.In addition, it beat the altitude world record for its category of less than 500 kg : 4789 m. This record was still not beaten. The Djinn was used by French Army and German Bundeswehr as observation and linking helicopter, but also for medical evacuation missions. CELAG's specimen Standard specifications. Current events - PolyMac.
Focke-Achgelis Fa 330 Bachstelze (Wagtail) Focke-Achgelis Fa 330 Bachstelze (Wagtail) The Fa-330 was one of several German "gyro-kites". It consisted of a seat and an un-powered overhead rotor. The pitch of the blades is such that as the wind strikes them they produce lift. The intent of the Fa-330 was to permit it's launching from the conning tower of a moving U-boat attached to a cable. The cable would be let out until the Fa-330 had reached sufficient altitude to scan the horizon for merchant ships. If time permitted, the pilot would be winched back aboard. In an emergency he could disconnect the tow-line in mid-air and either ride the Fa-330 down (it would descend in a controlled manner like an autogiro or a modern helicopter in "auto-rotation") or come down in a parachute. Friends have been kind enough to send me photos from the Deutches Museum in Munich and Science Museum at Swindon/Wroughton in England.
You'll find much more about the Fa-330 on these websites: Hiller Aviation & Museum | Exhibits. The helicopter which has most sparked the interest and imagination of visitors to the museum is undoubtedly the collapsible Rotorcycle. Small enough when folded to carry in a pod under an aircraft's wing or on the luggage rack of your car, this contraption becomes a full sized helicopter in a matter of minutes - capable of taking off from your backyard and flying anywhere in the San Francisco Bay Area on a single tank of gas. One of the initial design requirements was a device which could be dropped with a parachute to a downed pilot.
Without any tools, the helicopter can be rapidly assembled, started, and can carry the pilot across enemy lines to safety. Originally designed by Hiller Helicopters in the mid-1950's, the museum has the original ground-test prototype and a evaluation model on permanent display along with continuously playing footage of several early flights.
History Saunders Roe, an English aircraft manufacturer, was contracted to build ten additional Rotorcycles. Coandă effect. A spinning ping pong ball is held in a diagonal stream of air by the Coandă Effect. The ball "sticks" to the lower side of the air stream, which (in combination with the Magnus effect) stops the ball from falling down. The jet as a whole keeps the ball some distance from the jet exhaust, and gravity prevents it from being blown away. Discovery[edit] The lateral pressure which urges the flame of a candle towards the stream of air from a blowpipe is probably exactly similar to that pressure which eases the inflection of a current of air near an obstacle. Mark the dimple which a slender stream of air makes on the surface of water.
A hundred years later, Henri Coandă identified an application of the effect during experiments with his Coandă-1910 aircraft which mounted an unusual engine designed by Coandă. Causes[edit] Applications[edit] The first Avrocar being readied at the Avro factory in 1958 The effect was also implemented during the U.S. Demonstration[edit] Problems caused[edit] NOTAR. NOTAR is the name of a helicopter anti-torque system which replaces the use of a tail rotor. Developed by McDonnell Douglas Helicopter Systems (through their acquisition of Hughes Helicopters), the name is an acronym derived from the phrase no tail rotor.
The system uses a fan inside the tailboom to build a high volume of low-pressure air, which exits through two slots and creates a boundary layer flow of air along the tailboom utilizing the Coandă effect. The boundary layer changes the direction of airflow around the tailboom, creating thrust opposite the motion imparted to the fuselage by the torque effect of the main rotor. Directional yaw control is gained through a vented, rotating drum at the end of the tailboom, called the direct jet thruster. Advocates of NOTAR believe the system offers quieter and safer operation.[1] Development[edit] The use of directed air to provide anti-torque control had been tested as early as 1945 in the British Cierva W.9. Concept[edit] Applications[edit] Arthur M. Young: About Arthur M. Young.
MD LUH Explorer Home. Helicopter Aviation.