Download or read book In flight Measurement of Rotor Blade Airloads Bending Moments and Motions Together with Rotor Shaft Loads and Fuselage Vibration on a Tandem Rotor Helicopter Volume Iv Summary and Evaluation of Results written by Richard R. Pruyn and published by . This book was released on 1967 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes and evaluates the results of an extensive program to measure the dynamic effects of flight on a tandem rotor helicopter. The flight test results are reviewed and then compared with theoretical predictions and with other flight test data. The airloads measurements from this program are similar to those of other flight test programs, with one major exception: single lifting-rotor helicopter data differ from the forward rotor data of a tandem. The aft rotor apparently produces an upwash which gives an increase in the airloads on the inboard region of the forward rotor. This effect results in an airload distribution that is similar to that which would be obtained with an increased blade twist of the forward rotor. For most longitudinal cyclic trim settings, the oscillations of the airloads of both tandem rotors tend to be similar to those of a single rotor, with intrarotor tip vortex intersections causing the predominant disturbances. Longitudinal cyclic trim settings can be obtained experimentally with the tandem helicopter which cause large airload pressure oscillations due to the intersection of forward rotor blade vortexes by the aft rotor blades. These pressure oscillations occur rapidly and do not appear to increase blade stresses, rotor shaft loads, or airframe vibration. (Author).

Download or read book In flight Measurements of Rotor Blade Airloads Bending Moments and Motions Together with Rotor Shaft Loads and Fuselage Vibration on Tandem Rotor Helicopters written by and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In Flight Measurement of Rotor Blade Airloads Bending Moments and Motions Together with Rotor Shaft Loads and Fuselage Vibration on a Tandem Rotor Helicopter written by Roy Golub and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In flight Measurement of Rotor Blade Airloads Bending Moments and Motions Together with Rotor Shaft Loads and Fuselage Vibration on a Tandem Rotor Helicopter Volume I Instrumentation and In flight Recording System written by Roy Golub and published by . This book was released on 1967 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensively instrumented tandem rotor helicopter was developed to measure the rotor blade airloads and the resulting rotor blade motions and bending moments, rotor shaft loads and moments, and fuselage vibration. The report details the design, assembly, and testing of the instrumentation system and documents the capability of the system for fulfilling the requirements of the program. The selection and testing of the system components are described in detail, along with the integration of these components into the overall instrumentation and recording system. The exhaustive tests of the system, both on the ground and in flight, are described in step-by-step sequence. The capacities and capabilities of the system are delineated and illustrated. Four technical appendixes, giving precise engineering data and statistical records, are included in the report. (Author).

Download or read book In flight Measurement of Rotor Blade Airloads Bending Moments and Motions Together with Rotor Shaft Loads and Fuselage Vibration on a Tandem Rotor Helicopter Volume Ii Calibrations and Instrumented Component Testing written by William J. Grant and published by . This book was released on 1967 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calibration and instrumented component testing were performed to provide reliable instrumentation for the measurement of dynamic airloads on a large tandem rotor helicopter. All equipment underwent single-load calibration and much of it was calibrated for combined loads. Blade tension instrumentation was calibrated by whirl testing. The combined-loads calibrations represent an extension of the state of the art, especially for elastic structures such as rotor blades. All calibrations were evaluated qualitatively and a summary of the quality of all calibrations is presented. The general error in all calibrations is less than 3 percent. Component testing consisted of whirl tests and dynamic response tests of the rotor blades, and functional testing of the airloads pressure transducers. These tests determined the structural itegrity of the blade instrumentation and provided references for isolating the effects of such factors as blade bending, acceleration, and temperature. (Author).

Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1975 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Helicopter Theory written by Wayne Johnson and published by Courier Corporation. This book was released on 2012-03-07 with total page 1122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monumental engineering text covers vertical flight, forward flight, performance, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, stall, noise, and more. 189 illustrations. 1980 edition.

Download or read book IN FLIGHT MEASUREMENT OF ROTOR BLADE AIRLOADS BENDING MOMENTS AND MOTIONS TOGETHER WITH ROTOR SHAFT LOADS AND FUSELAGE VIBRATION ON A TANDEM ROTOR HELICOPTER VOLUME 5 INVESTIGATION OF BLADE STALL CONDITIONS written by and published by . This book was released on 1968 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes the results of an investigation into helicopter rotor blade stall conditions. The goals of this research were to increase the comprehension of blade stall and to aid in the future design of rotor blades with greater aerodynamic efficiency. The problem of rotor blade stall is discussed, covering areas such as rotor performance limitations, static airfoil section performance, dynamic and aerodynamic effects of the rotor environment, and radial flow effects. The results of the tests are presented and described in detail; they include tests at the high dynamic loads boundary, evidence of stall in rotor loads and blade motion data, coefficients of rotor airloads, and indications of negative aerodynamic damping. The test results are weighed against theoretical methods of prediction for purposes of comparison. The use of airloads measurements in the synthesis of airfoil data is investigated and a method for doing so is provided. The conclusions drawn from these tests are presented and recommendations for future research in this field are given.

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Download or read book Tip Aerodynamics and Acoustics Test written by Jeffrey L. Cross and published by . This book was released on 1988 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Shock and Vibration Bulletin written by and published by . This book was released on 1968 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research and Development Reports written by and published by . This book was released on 1965 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NH 3A Vibratory Airloads and Vibratory Rotor Loads written by United Aircraft Corporation. Sikorsky Aircraft Division and published by . This book was released on 1970 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1968 with total page 1130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1968 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research and Development Reports Index written by and published by . This book was released on 1968 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: