by National Aeronautics and Space Administration, Ames Research Center, For sale by the National Technical Information Service in Moffett Field, Calif, [Springfield, Va .
Written in English
|Statement||K. Bartie ... [et al.] ; prepared by Boeing Vertol Company, Philadelpia, PA for Ames Research Center.|
|Series||NASA contractor report -- 177436., NASA contractor report -- NASA CR-177436.|
|Contributions||Bartie, K. M., Ames Research Center.|
|The Physical Object|
Each rotor had three ft-long blades with a deg twist rate. The hover performance data, with and without ground effect, were measured during the ﬂight for wheel heights of 10, 20, 35, and 75 ft. Figure 4 shows correlation of the out-of-ground effect (OGE) hover performance data for the XHA ﬂight. The ﬂight test data were ob-. The ideal blade geometry for high speed forward flight is unlikely to be ideal for efficient hover and the designer must reach a compromise solution. The final configuration will be achieved by giving different weightings to hover performance according to the tasks which the . Helicopter performance revolves around whether or not the helicopter can be hovered. More power is required during the hover than in any other flight regime. Obstructions aside, if a hover can be maintained, a takeoff can be made, especially with the additional benefit of. The effects of single-arc blade profile length on the performance of a forward multiblade fan are investigated in this paper by computational fluid dynamics and experimental measurement. The present work emphasizes that the use of a properly reduced blade inlet angle (β1A) and properly improved blade outlet angle (β2A) is to increase the length blade profile, which suggests a good physical.
Aerodynamic interactions between rotors are important factors affecting the performance of in-plane multirotor Unmanned Air Vehicles (UAVs) or drones, which are the majority of small size UAVs (or mini-drones). Optimal design requires knowledge of the flow features. The low Reynolds number of many UAV rotors raises the question of how these features differ from those expected by traditional. Helicopter Blade. Helicopter blades are still an area of research for morphing, incorporating piezo elements for actuation and with the long-term goal of reducing the complex and maintenance intensive rotor kinematics and decreasing vibrations and noise (e.g., ). Rechargeable lithium metal batteries could potentially double the cell-level energy of state-of-the-art lithium-ion batteries (LIBs). 1 It has been considered as one of the most promising next-generation battery technologies for electric vehicles with increased driving mileage and reduced cost. A tremendous effort has thereby been pursued to tackle the challenges of rechargeable lithium metal. In his book, McBeath () describes in detail procedures and guides for developing a competition car from composites. The development was assisted by advanced computer-aided design (CAD) software package. Materials testing and selection were given high priority prior to the fabrication process to ensure the product will perform well during.
Back in , the U.S. Army partnered with with Mallory Aeronautics with the hope of building a hoverbike, a rectangular prop-powered flying device that . Short Circuit Test. Over discharge Test. Temperature Test. Imbalanced Charging Test. Dielectric Voltage Test. Isolation Resistance Test. Vibration Test. Shock Test. Crash Test. Drop Test. Mold Stress Test. Water Exposure Test. Thermal Cycling Test. Label Performance Test. Strain Relief Tests. Motor Overload Test. Motor-Lock Rotor Test. 20mm End. ABSTRACT: Our Hover Bike project is a flying motorized machine. It flies with two mini helicopter blades in the front and a jet engine in the back. It will look a lot like a chopper. It will have thrusters to hover, but it will also be able to have wheels, if Hover Bike will be based on present motorcycle technology. The EC T2 is a light single-engine helicopter including all the latest technology and a roomy modular cabin that can accommodate 1 pilot plus up to 7 passengers.. It is the quietest helicopter on the market: its Fenestron® tail rotor and automatic variable rotor speed control result in a significantly reduced external sound level.