Results 71 to 80 of about 63,753 (279)

HELICOPTER ROTOR DESIGN

Journal of Industrial Design and Engineering Graphics, 2011
The objective of this paper is to analyze the role of helicopter rotor, to classify them by type, and to imagine new types of helicopter rotors that can equip future helicopters.
IONESCU Cristian Andrei
doaj  

A Straight-bladed Vertical Axis Wind Turbine with a Directed Guide Vane Row

Journal of Fluid Science and Technology, 2008
A straight-bladed vertical axis wind turbine with a directed guide vane row has been proposed in order to enhance its torque. The experimental study of the proposed wind turbine was carried out by a wind tunnel with an outlet diameter of 1.8m. The tested
Manabu TAKAO, Takao MAEDA, Yasunari KAMADA, Michiaki OKI, Hideki KUMA   +4 more
doaj   +1 more source

Separation of Main and Tail Rotor Noise Sources from Ground-Based Acoustic Measurements Using Time-Domain De-Dopplerization [PDF]

, 2009
A new method of separating the contributions of helicopter main and tail rotor noise sources is presented, making use of ground-based acoustic measurements.
Greenwood, Eric II, Schmitz, Fredric H.
core   +1 more source

Aerodynamic characteristics of a 1/6-scale model of the rotor systems research aircraft with the rotors removed [PDF]

A wind-tunnel investigation was conducted to refine the aerodynamic characteristics of the rotor systems research aircraft. For the investigation, a 1/6-scale model without a main rotor or a tail rotor was used.
Freeman, C. R., Hassell, J. L., Jr., Mineck, R. E.   +2 more
core   +1 more source

Controlling Aggregation‐Induced Emission by Sterics in Nitrogen–Boron–Nitrogen (NBN)‐Doped Tetraphenylethylene‐Like Molecular Propellers

Chemistry – A European Journal, EarlyView.
Nitrogen–boron–nitrogen (NBN)‐substituted molecular propellers are presented as structural framework for aggregation induced emission (AIE) applications. Steric hindrance is revealed to steer maximum‐AIE behavior, leading to refined control over assembly‐induced luminescence.
Nico Groß, Bojan Tanović, Frank Hampel, Henry Dube, Ani Ozcelik   +4 more
wiley   +1 more source

Green Maintenance Technology for Large Area Damage of Composite Tail Rotor Blade

Engineering Proceedings
Based on the analysis of the damage location, damage size, product layering structure, and internal filling structure of the composite tail rotor blade, the damage maintenance technical scheme was initially determined.
Miao Ren, Qidi Liu, Nan Lv, Lili Li
doaj   +1 more source

Rating helicopter noise [PDF]

The effectiveness of the EPNL procedure in quantifying helicopter blade slap and tail rotor noise heard on approach some distance from the flyover position is addressed.
Leverton, J. W., Pike, A. C., Southwood, B. J.   +2 more
core   +1 more source

Examining the stability derivatives of a compound helicopter [PDF]

, 2016
Some helicopter manufacturers are exploring the compound helicopter design as it could potentially satisfy the new emerging requirements placed on the next generation of rotorcraft.
Ferguson, Kevin, Thomson, Douglas
core   +1 more source

Purification, Fluorescent Labeling, and Detyrosination of Mammalian Cell Tubulin for Biochemical Assays

Cytoskeleton, EarlyView.
ABSTRACT Microtubules play essential roles in numerous cellular processes. All microtubules are built from the protein tubulin, yet individual microtubules can differ spatially and temporally due to their tubulin isotype composition and post‐translational modifications (PTMs).
Ezekiel C. Thomas, Yang Yue, Morgan L. Pimm, Takashi Hotta, Ryoma Ohi, Kristen J. Verhey   +5 more
wiley   +1 more source

Interactional aerodynamics and acoustics of a propeller-augmented compound coaxial helicopter [PDF]

, 2008
The aerodynamic and acoustic characteristics of a generic hingeless coaxial helicopter with a tail-mounted propulsor and stabiliser have been simulated using Brown's Vorticity Transport Model.
Brown, Richard, Duraisamy, Karthikeyan, Kenyon, Adam R., Kim, Hyo Wan   +3 more
core