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result(s) for
"helicopter"
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Rotorcraft Aeromechanics
A rotorcraft is a class of aircraft that uses large-diameter rotating wings to accomplish efficient vertical take-off and landing. The class encompasses helicopters of numerous configurations (single main rotor and tail rotor, tandem rotors, coaxial rotors), tilting proprotor aircraft, compound helicopters, and many other innovative configuration concepts. Aeromechanics covers much of what the rotorcraft engineer needs: performance, loads, vibration, stability, flight dynamics, and noise. These topics include many of the key performance attributes and the often-encountered problems in rotorcraft designs. This comprehensive book presents, in depth, what engineers need to know about modelling rotorcraft aeromechanics. The focus is on analysis, and calculated results are presented to illustrate analysis characteristics and rotor behaviour. The first third of the book is an introduction to rotorcraft aerodynamics, blade motion, and performance. The remainder of the book covers advanced topics in rotary wing aerodynamics and dynamics.
eBook
The Ingenuity Helicopter on the Perseverance Rover
The
Ingenuity Helicopter
will be deployed from the
Perseverance Rover
for a 30-sol experimental campaign shortly after the rover lands and is commissioned. We describe the helicopter and the associated
Technology Demonstration
experiment it will conduct, as well as its role in informing future helicopter missions to Mars. This helicopter will demonstrate, for the first time, autonomous controlled flight of an aircraft in the Mars environment, thus opening up an aerial dimension to Mars exploration. The
1.8
kg
,
1.2
m
diameter helicopter, with twin rotors in a counter-rotating co-axial configuration, will help validate aerodynamics, control, navigation and operations concepts for flight in the thin Martian atmosphere. The rover supports a radio link between the helicopter and mission operators on Earth, and information returned from a planned set of five flights, each lasting up to 90 seconds, will inform the development of new Mars helicopter designs for future missions. Such designs in the
4
kg
–
30
kg
range would have the capability to fly many kilometers daily and carry science payloads of
1
kg
–
5
kg
. Small helicopters can be deployed as scouts for future rovers helping to select interesting science targets, determine optimal rover driving routes, and providing contextual high-vantage imagery. Larger craft can be operated in standalone fashion with a tailored complement of science instruments with direct-to-orbiter communication enabling wide-area operations. Other roles including working cooperatively with a central lander to provide area-wide sampling and science investigations. For future human exploration at Mars, helicopter can be employed to provide reconnaissance.
Journal Article
Apache helicopters
When the United States Army needs to attack an enemy base, Apache helicopters are called into action. These fast, maneuverable vehicles are equipped with advanced technology to deal with any situation. This title explores the parts, weapons, and missions of Apache helicopters.
Book
AS-350B könnyű-többcélú helikopter a Magyar Légierőben
A helikopterek diadalmenetének kezdete a 20. század elejére tehető. Bár a technológia - a szó szoros és átvitt értelmében is - akkoriban még csupán a szárnyait bontogatta, a sokoldalúság és a számtalan felhasználási, alkalmazási lehetőség előrevetítette az új repülőeszköz majdani sikerét. A kor előrehaladtával sorra jelentek meg a korszerűbb típusok, amelyek egyre hatékonyabbak, erősebbek, gyorsabbak, és ami a fő, egyre biztonságosabbak lettek.
Journal Article
AH-6 Little Birds
\"Amazing photography accompanies engaging information about AH-6 Little Birds. The combination of high-interest subject matter and light text is intended for students in grades 3 through 7\"--Provided by publisher.
Book
Influence of Engine Dynamic Characteristics on Helicopter Handling Quality in Hover and Low-Speed Forward Flight
This study assesses the influence of engine dynamic characteristics on helicopter handling quality during hover and low-speed forward flight. First, we construct the helicopter–engine coupling model (HECM) based on the power-matching relationship between the engine and the rotor. The impact of the engine is evaluated by comparing HECM with a helicopter model without the engine. To assess the engine’s influence quantitatively, we consider torque response, height response, and collective–yaw coupling characteristics in ADS-33E-PRF handling quality criteria. The results reveal that the engine power output lag can deteriorate the helicopter’s torque and height response handling quality rate (HQR). After the increase in helicopter mass, the torque HQR caused by engine influence improved, and the altitude HQR further deteriorated. The engine dynamic characteristics can also reverse the yaw rate, decreasing collective–yaw coupling HQR. As the helicopter’s flight speed increased, the engine’s impact on the yaw rate increased by 41.8%. This study can provide valuable insight into the effects of engine dynamic characteristics on helicopter handling quality and offer a reference for the design of helicopter–engine coupling control laws.
Journal Article