Charts For Estimating Rotor Blade Flapping Motion Of High Performance Helicopters PDF Download
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Author | : Robert J. Tapscott |
Publisher | : |
Total Pages | : 692 |
Release | : 1956 |
Genre | : Charts, diagrams, etc |
ISBN | : |
Download Charts for Estimating Rotor-blade Flapping Motion of High-performance Helicopters Book in PDF, ePub and Kindle
Theoretically derived charts showing steady-state and first- and second-harmonic flapping coefficients are presented for helicopter rotors having hinged rectangular blades with a linear twist of 0, -8, and -16 degrees. The charts, showing the rotor flapping coefficients for combinations of inflow ratio and blade pitch angle, are presented for tip-speed ratios ranging from 0.05 to 0.50.
Author | : Alfred Gessow |
Publisher | : |
Total Pages | : 33 |
Release | : 1956 |
Genre | : Aeronautics |
ISBN | : |
Download Charts for Estimating Performance of High-performance Helicopters Book in PDF, ePub and Kindle
The charts may be used to study the effects of design changes on rotor performance and to indicate optimum performance conditions, as well as to estimate quickly rotor performance in forward flight. They are also useful in obtaining inflow-ratio and pitch-angle values for use in calculating flapping coefficients and spanwise loadings. The method of applying the charts t o performance estimation is illustrated through sample calculation of a typical rotor-performance problem.
Author | : Wayne Johnson |
Publisher | : Cambridge University Press |
Total Pages | : 949 |
Release | : 2013-04-29 |
Genre | : Mathematics |
ISBN | : 1107028078 |
Download Rotorcraft Aeromechanics Book in PDF, ePub and Kindle
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.
Author | : Alfred Gessow |
Publisher | : |
Total Pages | : 50 |
Release | : 1960 |
Genre | : Lift (Aerodynamics) |
ISBN | : |
Download Tables and Charts for Estimating Stall Effects on Lifting-rotor Characteristics Book in PDF, ePub and Kindle
Author | : United States. National Advisory Committee for Aeronautics |
Publisher | : |
Total Pages | : 1038 |
Release | : 1956 |
Genre | : Aeronautics |
ISBN | : |
Download Technical Note - National Advisory Committee for Aeronautics Book in PDF, ePub and Kindle
Author | : United States. National Advisory Committee for Aeronautics |
Publisher | : |
Total Pages | : 348 |
Release | : 1956 |
Genre | : Aeronautics |
ISBN | : |
Download Technical Note Book in PDF, ePub and Kindle
Author | : George G. Edwards |
Publisher | : |
Total Pages | : 658 |
Release | : 1956 |
Genre | : Aerodynamics |
ISBN | : |
Download Analysis of Wind-tunnel Tests to a Mach Number of 0.90 of a Four-engine Propeller-driving Airplane Configuration Having a Wing with 40 Degrees Sweepback and an Aspect Ratio of 10 Book in PDF, ePub and Kindle
An investigation has been conducted at speeds up to a Mach number of 0.90 to determine the effects of operating propellers on the longitudinal characteristics of a four-engine tractor airplane configuration having a 40 degrees swept wing with an aspect ratio of 10. Results of wind-tunnel tests of a model representing such an airplane configuration (see NACA TN 3789) show that these effects are of most concern in the low-speed high-thrust flight regime. In the present report the low-speed data are analyzed to determine the source of the various effects and to indicate how the adverse effects can be reduced, and the high-speed data are discussed primarily from the standpoint of Mach number effects. The analysis of the low-speed data indicates that the large variations of longitudinal stabil.itywith angle of attack resulted primarily from passage of the tail into and out of the slipstream. The slipstream also created large lift increments on the wing, particularly with flaps deflected, which resulted in increases in stability (with increasing thrust coefficient) from the outboard propeller and decreases in stability from the inboard propeller. It was concluded that the longitudinal stabiltty characteristics of the model couldbe improved by moving the nacelles outward, increasing the tail height, and reducing the tail span.
Author | : |
Publisher | : |
Total Pages | : 408 |
Release | : 1967 |
Genre | : |
ISBN | : |
Download NASA Technical Note Book in PDF, ePub and Kindle
Author | : Wilber B. Huston |
Publisher | : |
Total Pages | : 684 |
Release | : 1956 |
Genre | : Buffeting (Aerodynamics) |
ISBN | : |
Download Probability and Frequency Characteristics of Some Flight Buffet Loads Book in PDF, ePub and Kindle
The frequency characteristics and statistical properties of the buffet loads measured on the unswept wing and tail of a fighter airplane have been studied in the stall and in the shock regime. The results indicate that the wing loads in buffeting can be treated as the Gaussian response of a simple elastic system. The tail loads appear to represent a more complicated pattern.
Author | : United States. National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : 438 |
Release | : 1959 |
Genre | : Aeronautics |
ISBN | : |
Download NASA Memorandum Book in PDF, ePub and Kindle