Performance prediction of helicopters stepniewski and keys pdf
Volume II: ”Performance Prediction of Helicopters” offers practical application of the rotary-wing aerodynamic theories discussed in Volume I, and contains complete and detailed performance calculations for conventional single-rotor, winged, and tandem-rotor helicopters.
PDF The current status of Canadian research on rotor-based actively controlled technologies for helicopters is reviewed in this paper. First, worldwide research in this field is overviewed to
aerodynamic performance predictions of rigid blade helicopter and tiltrotor configurations in hover [19,20]. This work extends the validation to helicopter airloads in
直升机空气动力学和性能-Helicopter Aerodynamics and Performance – 直升机空气动力学和性能-Helicopter Aerodynamics and Per… 百度首页 登录
Dover Books on Aeronautical Engineering: Rotary-Wing Aerodynamics by W. Z. Stepniewski and C. N. Keys (1984, Paperback) Be the first to write a review About this product
A simple performance prediction can be analyzed in this phase in order to get a con?guration that better satis?es the design requirements as shown in Figure 2. Preliminary design Preliminary design starts with modelling the con?guration obtained in the conceptual design and then all disciplines related to the rotorcraft are analyzed. Parametric model The con?guration obtained from the
Basic theories of rotor aerodynamics (with application to helicopters) / by W.Z. Stepniewski –Performance prediction of helicopters / by C.N. Keys ; edited by W.Z. Stepniewski. Abstract: Clear, concise text covers aerodynamic phenomena of the rotor and offers guidelines for helicopter performance evaluation.
1 038 PERFORMANCE PREDICTION OF INLET BARRIER FILTER SYSTEMS FOR ROTORCRAFT Nicholas Bojdo 1 & Antonio Filippone The University of Manchester Manchester M60 1QD
工科学生的空气动力学，第五版 Aerodynamics for Engineering Students, Fifth Edition 直升机空气动力学-第4章 直升机空气动力学-第6章
January 1979.Volume 2 edited and revised by W.Z. Stepniewski.Prepared for Ames Research Center under contract NAS2-7007.Includes bibliographical references.v. 1. Stepniewski, W.Z. Basic theories of rotor aerodynamics (with application to helicopters).–v.2 Keys, C.N. Performance prediction of
Sample records for ladder design part THe model enables prediction of the number of missions possible and vehicle turn-time (the time between completion of one mission and the start of the next) given estimated values for component reliability and maintainability. The model also facilitates study of the manpower and vehicle requirements for the proposed vehicle to meet its desired mission
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Rotary Wing Aerodynamics by Keys AbeBooks
(PDF) Review of Active Rotor Control Research in Canada
The rotor wake calculation may become the central part of a rotor performance prediction program. An example is the UTRC program [6] which computes the induced velocities from the wake positions and the circulation around the blades. Figure 4 outlines the procedure for using the UTRC code to compute a rotor wake in a general rotor performance calculation which includes blade loads, stresses
As Bramwell has put it, ‘the improvement in performance may be quite remarkable; indeed some of the earlier, underpowered, helicopters could hover only with the help of the ground’. The theoretical approach to ground effect is, as would be expected, by way of an image concept. A theory by Knight and Hafner [11] makes two assumptions about the normal wake:
A varie variety ty of tools tools are are need needed ed to to under understan stand, d, and and pred predict ict thes these e pheno phenomen mena. a. Tools needed include – Simple back-of-the envelop tools for sizing helicopters, selecting engines, engines, laying out configuration, and predicting performance – Spreadsheets and MATLAB MATLAB scripts for mapping out out the blade loads
30/11/2001 · Stepniewski, W.Z. & Keys, C.N. Rotary – Wing Aerodynamics NY, Dover, Trade PB EditionIncludes Vol. 1: Basic Theories of Rotor Aerodynamics and Vol. 2: Performance Prediction of Helicopters. I have not seen Leishman’s book, he is very bright, U of Maryland.
A More Accurate Characterization of UH-60A Pitch Link Loads Using Neural Networks Sesi Kottapalli Aeromechanics Branch Army/NASA Rotorcraft Division
Indeed, helicopters play a critical role in a wide variety of activities from important military missions to emergency medical transport. In this paper we examine the fundamental fluid dynamics and aeromechanics of the helicopter rotor wake which possesses a wide range of diverse fluid mechanics problems from incompressible inviscid flow to transonic and even supersonic viscous flow.
The behaviour of helicopters is so complex that understanding the physical mechanisms at work in trim, stability and response, and thus the prediction of Flying Qualities, requires a framework of analytical and numerical modelling and simulation.
performance predictions are compared to Boeing flight Pahlke et al.ve31, also for full-vehicle helicopter modeling because the details of The rotor blade material can be assumed rigid with the rotor-rotor and/or rotor-fuselage interactions are prescribed control inputs or the model can be coupled typically very important in determining the overall with a suitable comprehensive structural
Flight Performance of Fixed and Rotary Wing Aircraft To my mother Flight Performance of Fixed and Rotary Wing Aircraft Antonio Filippone AMSTERDAM • BOSTON • HEIDELBERG • LONDON • NEW YORK • OXFORD PARIS • SAN DIEGO • SAN FRANCISCO • SINGAPORE • SYDNEY • TOKYO Butterworth-Heinemann is an imprint of Elsevier
Volume I: is Basic Theories of Rotor Aerodynamics and Volume II is Performance Prediction of Helicopters. Graduate students with some background in general aerodynamics, or ‘those engaged in other fields of aeronautical or nonaeronautical engineering, will find-this an essential and thoroughly practical reference text on basic rotor dynamics. While the material deals primarily with the
Rotary-Wing Aerodynamics: Two Volumes Bound as One. Vol. 1: Basic Theories of Rotor Aerodynamics (With Application to Helicopters). W. Z. Stepniewski Vol. 2: Performance Prediction of Helicopters.
Volume II: “Performance Prediction of Helicopters” offers practical application of the rotary-wing aerodynamic theories discussed in Volume I, and contains complete and detailed performance calculations for conventional single-rotor, winged, and tandem-rotor helicopters.
Review of Active Rotor Control Research in Canada Daniel Feszty* and Fred Nitzsche** Rotorcraft Research Group, Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, K1S 5B6 Ottawa, ON, Canada * Associate Professor, corresponding author E-mail
Stepniewski, W.Z. & Keys, C.N. Rotary – Wing Aerodynamics NY, Dover, Trade PB EditionIncludes Vol. 1: Basic Theories of Rotor Aerodynamics and Vol. 2: Performance Prediction of Helicopters. I have not seen Leishman’s book, he is very bright, U of Maryland.
The two key issues to be solved for this swashplateless control concept are actuation of the trailing edge controls and evaluating the performance of the swashplateless rotor compared to conventionally controlled helicopters. Solving the rst requires simultaneous minimization of trail-ing ap control angles and hinge moments to reduce actuation power. The second issue requires not only the
Rotary-wing aerodynamics by W. Z. Stepniewski, 1979, National Aeronautics and Space Administration, Scientific and Technical Information Office, for sale by the National Technical Information Service edition, in English
This work studies the design of trailing edge controls for swashplateless helicopter primary control, and examines the impact of those controls on the performance of the rotor.
Aerodynamics ~ Coriolis PPRuNe Forums
1/11/1984 · Volume II: “Performance Prediction of Helicopters” offers practical application of the rotary-wing aerodynamic theories discussed in Volume I, and contains complete and detailed performance calculations for conventional single-rotor, winged, and tandem-rotor helicopters.
© L. Sankar Helicopter Aerodynamics 1 Helicopter Aerodynamics and Performance Preliminary Remarks © L. Sankar Helicopter Aerodynamics
The compound helicopter is a high-speed design concept that is once again being explored due to emerging requirements for rotorcraft to obtain speeds that significantly surpass the conventional helicopter. This increase in speed, provided efficient hover capability is maintained, would make the
To fill that void in technical data, NASA commissioned the highly respected practicing engineers.aml authors W. Z. Stepniewski and ‘C, N. Keys to write one. The result is a clear, concise.introduction, highly recommended by U.S. Army experts, that provides students of helicopter and aeronautical engineering with an understanding of the aerodynamic phenomena of the rotor. In addition, it
Forward flight prediction using the equivalent solidity approach has been shown to produce answers than experiment (Dingledein very different (ref.2 . figure 30 shows that varying the separation distance has little practical use by itself. swirl recovery is a secondary effect. isolated rotor) must use different convection and contraction rates. coaxial helicopters for hovering platforms. and
To introduce and study key concepts related to aerodynamic loads, vehicle performance, basic rotor dynamics, and control of helicopters and tilt-rotor aircraft.
lwhere the kT coefficient reflects taper influence (fig. 12),and col is the average blade-lift coefficient.These performance predictions were compared againstHarringtons experiments (ref. 3) by Stepniewski et al. infigure 13 (ref. 31). Very similar results were achieved,and Stepniewski concluded that Helicopters appears tobe sufficiently accurate for preliminary performanceestimates of coaxial
1/01/1979 · Abstract: Application of theories, as well as, special methods of procedures applicable to performance prediction are illustrated first, on an example of the conventional helicopter and then, winged and tandem configurations.
Abstract. Basic theories of rotor aerodynamics are presented and applied to the performance prediction of helicopters. The very simple physicomathematical model of the rotor offered by momentum theory is addressed first, followed by the combined blade-element and momentum theory. – fortnite tracker how to change picture • Part 1: Hover Prediction Methods • Part 2: Forward Flight Prediction Methods • Part 3: Helicopter Performance Prediction Methods • Part 4: Introduction to Comprehensive Codes and CFD tools • Part 5: Completion of CFD tools.Plan for the Course • PowerPoint presentations. Sankar Helicopter Aerodynamics 4 . interspersed with numerical calculations and spreadsheet applications
A Case Study of Earned Schedule to do Predictions By Lewis Hecht Consultant in EVMS Vestal, NY 13850 607-765-2731 LCHECHT@AOL.COM. 2 Agenda of Presentation • Introduction to earned schedule • Summary of technical references • Our case study • Defense Contract Management Agency concerns • Mathematical modeling details • Review of contractor performance • Prediction accuracy
Basic theories of rotor aerodynamics (with application to helicopters) / by W.Z. Stepniewski –Performance prediction of helicopters / by C.N. Keys ; edited by W.Z. Stepniewski. More information: Publisher description
The compound helicopter is a high-speed design concept that is once again being explored due to emerging requirements for rotorcraft to obtain speeds that …
1/01/1984 · Stepniewski, W. Z. Keys, C. N. Abstract: Basic theories of rotor aerodynamics are presented and applied to the performance prediction of helicopters. The very simple physicomathematical model of the rotor offered by momentum theory is addressed first, followed by the combined blade-element and momentum theory. Vortex theory is discussed, and a rotor blade is …
Performance prediction of conventional helicopters in hover and vertical ascent are investigated. Various approaches to performance prediction in forward translation are presented. Performance problems are discussed only this time, a
Performance prediction of helicopters for use in both the preliminary and Detailed Design process has been the subject of numerous articles and studies.
A simple performance prediction can be analyzed in this phase in order to get a configuration that better satisfies the design requirements as shown in Figure 2.
– Simple back-of-the envelop tools for sizing helicopters, selecting engines, laying out configuration, and predicting performance – Spreadsheets and MATLAB scripts for mapping out the blade loads over the entire rotor disk – High end CFD tools for modeling
Rotor loadings give a measure of the aircraft size needed to lift a given gross weight, Stepniewski and Keys . A partial list of data is presented in Table 4 . The rotor equivalent disk loading W / A is shown in Fig. 16 , where the rotorcraft are compared at constant technology level.
Volume II: “Performance Prediction of Helicopters” offers practical application of the rotary-wing aerodynamic theories discussed in Volume I, and contains complete and detailed performance calculations for conventional single-rotor, winged, and tandem-rotor helicopters. Graduate students with some background in general aerodynamics, or those engaged in other fields of aeronautical or
• Tools needed include – Simple back-of-the envelop tools for sizing helicopters, selecting engines, laying out configuration, and predicting performance – Spreadsheets and MATLAB scripts for mapping out the blade loads over the entire rotor disk – High end CFD tools for modeling • Airfoil and rotor aerodynamics and design • Rotor-airframe interactions • Aeroacoustic analyses
1/11/1974 · Abstract: Results are presented of a study of the relative and absolute energy consumption of helicopters, including limited comparisons with fixed-wing aircraft, and selected surface transportation vehicles.
(PDF) Development of integrated rotorcraft design and
Rotary-wing aerodynamics. (eBook 1984) [WorldCat.org]
ROTOR AIRLOADS PREDICTION USING LOOSE AERODYNAMIC
ladder design part Topics by Science.gov
直升机空气动力学和性能-Helicopter Aerodynamics
ROTARY-WING AERODYNAMICS BOOK from Aircraft Spruce
Performance comparison between a conventional helicopter
https://en.wikipedia.org/wiki/Sikorsky_R-5
Rotary-wing aerodynamics. (Book 1984) [WorldCat.org]
– COMPUTER PROGRAM FOR PERFORMANCE PREDICTION OF j/1
Rotary-Wing Aerodynamics by W. Z. Stepniewski Paperback
Rotary-wing aerodynamics (1979 edition) Open Library
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Defense Technical Information Center Compilation Part
Basic theories of rotor aerodynamics (with application to helicopters) / by W.Z. Stepniewski –Performance prediction of helicopters / by C.N. Keys ; edited by W.Z. Stepniewski. Abstract: Clear, concise text covers aerodynamic phenomena of the rotor and offers guidelines for helicopter performance evaluation.
ABSTRACT DESIGN AND PERFORMANCE PREDICTION OF
Rotary-Wing Aerodynamics 9780486646473 VitalSource
Volume II: “Performance Prediction of Helicopters” offers practical application of the rotary-wing aerodynamic theories discussed in Volume I, and contains complete and detailed performance calculations for conventional single-rotor, winged, and tandem-rotor helicopters.
038 PERFORMANCE PREDICTION OF INLET BARRIER FILTER
(PDF) Development of integrated rotorcraft design and
Performance prediction of conventional helicopters in hover and vertical ascent are investigated. Various approaches to performance prediction in forward translation are presented. Performance problems are discussed only this time, a
038 PERFORMANCE PREDICTION OF INLET BARRIER FILTER
NASA Technical Reports Server (NTRS) Documenting
performance predictions are compared to Boeing flight Pahlke et al.ve31, also for full-vehicle helicopter modeling because the details of The rotor blade material can be assumed rigid with the rotor-rotor and/or rotor-fuselage interactions are prescribed control inputs or the model can be coupled typically very important in determining the overall with a suitable comprehensive structural
Aerodynamics ~ Coriolis [Archive] PPRuNe Forums
Rotary-Wing Aerodynamics by W. Z. Stepniewski · OverDrive
ABSTRACT DESIGN AND PERFORMANCE PREDICTION OF
The rotor wake calculation may become the central part of a rotor performance prediction program. An example is the UTRC program [6] which computes the induced velocities from the wake positions and the circulation around the blades. Figure 4 outlines the procedure for using the UTRC code to compute a rotor wake in a general rotor performance calculation which includes blade loads, stresses
Rotary-wing aerodynamics. (eBook 1984) [WorldCat.org]
• Part 1: Hover Prediction Methods • Part 2: Forward Flight Prediction Methods • Part 3: Helicopter Performance Prediction Methods • Part 4: Introduction to Comprehensive Codes and CFD tools • Part 5: Completion of CFD tools.Plan for the Course • PowerPoint presentations. Sankar Helicopter Aerodynamics 4 . interspersed with numerical calculations and spreadsheet applications
Performance comparison between a conventional helicopter
As Bramwell has put it, ‘the improvement in performance may be quite remarkable; indeed some of the earlier, underpowered, helicopters could hover only with the help of the ground’. The theoretical approach to ground effect is, as would be expected, by way of an image concept. A theory by Knight and Hafner [11] makes two assumptions about the normal wake:
Rotary-wing Aerodynamics Wieslaw Zenon Stepniewski C. N
Data and performances of selected aircraft and rotorcraft
Rotary-Wing Aerodynamics (Dover Books on Aeronautical
Dover Books on Aeronautical Engineering: Rotary-Wing Aerodynamics by W. Z. Stepniewski and C. N. Keys (1984, Paperback) Be the first to write a review About this product
A More Accurate Characterization of UH-60A Pitch Link
Rotary Wing Aerodynamics – helicoptersonly.com
Review of Active Rotor Control Research in Canada Fred
– Simple back-of-the envelop tools for sizing helicopters, selecting engines, laying out configuration, and predicting performance – Spreadsheets and MATLAB scripts for mapping out the blade loads over the entire rotor disk – High end CFD tools for modeling
bol.com Rotary-Wing Aerodynamics W. Z. Stepniewski
Rotary-Wing Aerodynamics: Two Volumes Bound as One. Vol. 1: Basic Theories of Rotor Aerodynamics (With Application to Helicopters). W. Z. Stepniewski Vol. 2: Performance Prediction of Helicopters.
(PDF) Development of integrated rotorcraft design and
Dover Books on Aeronautical Engineering: Rotary-Wing Aerodynamics by W. Z. Stepniewski and C. N. Keys (1984, Paperback) Be the first to write a review About this product
Rotary-Wing Aerodynamics by W. Z. Stepniewski · OverDrive
038 PERFORMANCE PREDICTION OF INLET BARRIER FILTER
This work studies the design of trailing edge controls for swashplateless helicopter primary control, and examines the impact of those controls on the performance of the rotor.
直升机空气动力学和性能-Helicopter Aerodynamics
Stepniewski, W.Z. & Keys, C.N. Rotary – Wing Aerodynamics NY, Dover, Trade PB EditionIncludes Vol. 1: Basic Theories of Rotor Aerodynamics and Vol. 2: Performance Prediction of Helicopters. I have not seen Leishman’s book, he is very bright, U of Maryland.
Review of Active Rotor Control Research in Canada Fred
Part1 (5) Helicopter Aerodynamics and Performance
Dover Books on Aeronautical Engineering: Rotary-Wing Aerodynamics by W. Z. Stepniewski and C. N. Keys (1984, Paperback) Be the first to write a review About this product
Rotary-Wing Aerodynamics (Engineering… book by W.Z
bol.com Rotary-Wing Aerodynamics W. Z. Stepniewski
The rotor wake calculation may become the central part of a rotor performance prediction program. An example is the UTRC program [6] which computes the induced velocities from the wake positions and the circulation around the blades. Figure 4 outlines the procedure for using the UTRC code to compute a rotor wake in a general rotor performance calculation which includes blade loads, stresses
wing minnesota volume Topics by Science.gov
1 038 PERFORMANCE PREDICTION OF INLET BARRIER FILTER SYSTEMS FOR ROTORCRAFT Nicholas Bojdo 1 & Antonio Filippone The University of Manchester Manchester M60 1QD
Rotary-wing aerodynamics. (Book 1984) [WorldCat.org]
A More Accurate Characterization of UH-60A Pitch Link Loads Using Neural Networks Sesi Kottapalli Aeromechanics Branch Army/NASA Rotorcraft Division
NASA Technical Reports Server (NTRS) Documenting
Rotary Wing Aerodynamics – helicoptersonly.com
Rotary-Wing Aerodynamics by W. Z. Stepniewski Paperback
Rotor loadings give a measure of the aircraft size needed to lift a given gross weight, Stepniewski and Keys . A partial list of data is presented in Table 4 . The rotor equivalent disk loading W / A is shown in Fig. 16 , where the rotorcraft are compared at constant technology level.
(PDF) Review of Active Rotor Control Research in Canada
AERSP 407 and AERSP 504 Aerodynamics of V/STOL Aircraft
Rotary-Wing Aerodynamics (Dover Books on Aeronautical
A simple performance prediction can be analyzed in this phase in order to get a configuration that better satisfies the design requirements as shown in Figure 2.
Rotary-Wing Aerodynamics by W. Z. Stepniewski by W. Z
nasa-tp-3675.pdf [PDF Document]
Dover Books on Aeronautical Engineering Rotary-Wing
A Case Study of Earned Schedule to do Predictions By Lewis Hecht Consultant in EVMS Vestal, NY 13850 607-765-2731 LCHECHT@AOL.COM. 2 Agenda of Presentation • Introduction to earned schedule • Summary of technical references • Our case study • Defense Contract Management Agency concerns • Mathematical modeling details • Review of contractor performance • Prediction accuracy
nasa-tp-3675.pdf [PDF Document]
Helicopter Aeromechanics MAFIADOC.COM
Rotary-Wing Aerodynamics by W. Z. Stepniewski (ebook)
Rotary-wing aerodynamics by W. Z. Stepniewski, 1979, National Aeronautics and Space Administration, Scientific and Technical Information Office, for sale by the National Technical Information Service edition, in English
Aerodynamics ~ Coriolis PPRuNe Forums
Rotary-Wing Aerodynamics W. Z. Stepniewski – Book Depository
COMPUTER PROGRAM FOR PERFORMANCE PREDICTION OF j/1
Volume I: is Basic Theories of Rotor Aerodynamics and Volume II is Performance Prediction of Helicopters. Graduate students with some background in general aerodynamics, or ‘those engaged in other fields of aeronautical or nonaeronautical engineering, will find-this an essential and thoroughly practical reference text on basic rotor dynamics. While the material deals primarily with the
Rotary-Wing Aerodynamics W. Z. Stepniewski – Book Depository
Rotary Wing Aerodynamics – helicoptersonly.com
© L. Sankar Helicopter Aerodynamics 1 Helicopter Aerodynamics and Performance Preliminary Remarks © L. Sankar Helicopter Aerodynamics
(PDF) Development of integrated rotorcraft design and
A More Accurate Characterization of UH-60A Pitch Link
Rotary-Wing Aerodynamics Two Volumes Bound as One. Vol. 1
Indeed, helicopters play a critical role in a wide variety of activities from important military missions to emergency medical transport. In this paper we examine the fundamental fluid dynamics and aeromechanics of the helicopter rotor wake which possesses a wide range of diverse fluid mechanics problems from incompressible inviscid flow to transonic and even supersonic viscous flow.
Rotary-Wing Aerodynamics by W. Z. Stepniewski (ebook)
Defense Technical Information Center Compilation Part
038 PERFORMANCE PREDICTION OF INLET BARRIER FILTER
Forward flight prediction using the equivalent solidity approach has been shown to produce answers than experiment (Dingledein very different (ref.2 . figure 30 shows that varying the separation distance has little practical use by itself. swirl recovery is a secondary effect. isolated rotor) must use different convection and contraction rates. coaxial helicopters for hovering platforms. and
Rotary-Wing Aerodynamics W. Z. Stepniewski – Book Depository
Abstract. Basic theories of rotor aerodynamics are presented and applied to the performance prediction of helicopters. The very simple physicomathematical model of the rotor offered by momentum theory is addressed first, followed by the combined blade-element and momentum theory.
Data and performances of selected aircraft and rotorcraft
NASA Technical Reports Server (NTRS) Documenting
nasa-tp-3675.pdf [PDF Document]
Sample records for ladder design part THe model enables prediction of the number of missions possible and vehicle turn-time (the time between completion of one mission and the start of the next) given estimated values for component reliability and maintainability. The model also facilitates study of the manpower and vehicle requirements for the proposed vehicle to meet its desired mission
Helicopter Slides Helicopter Helicopter Rotor
Rotary Wing Aerodynamics by Keys AbeBooks
Flight Performance of Fixed and Rotary Wing Aircraft PDF
直升机空气动力学和性能-Helicopter Aerodynamics and Performance – 直升机空气动力学和性能-Helicopter Aerodynamics and Per… 百度首页 登录
(PDF) Review of Active Rotor Control Research in Canada
直升机空气动力学和性能-Helicopter Aerodynamics
Review of Active Rotor Control Research in Canada Daniel Feszty* and Fred Nitzsche** Rotorcraft Research Group, Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, K1S 5B6 Ottawa, ON, Canada * Associate Professor, corresponding author E-mail
NASA Technical Reports Server (NTRS) Documenting
Stepniewski W Z and C N Keys AbeBooks
Rotary-Wing Aerodynamics 9780486646473 VitalSource
Performance prediction of conventional helicopters in hover and vertical ascent are investigated. Various approaches to performance prediction in forward translation are presented. Performance problems are discussed only this time, a
Data and performances of selected aircraft and rotorcraft
– Simple back-of-the envelop tools for sizing helicopters, selecting engines, laying out configuration, and predicting performance – Spreadsheets and MATLAB scripts for mapping out the blade loads over the entire rotor disk – High end CFD tools for modeling
Rotary-Wing Aerodynamics by W. Z. Stepniewski Paperback
A simple performance prediction can be analyzed in this phase in order to get a configuration that better satisfies the design requirements as shown in Figure 2.
Modern Helicopter Aerodynamics Helicopter Helicopter Rotor
Rotary-Wing Aerodynamics (Dover Books on Aeronautical