scholarly journals Design of a Three Surfaces R/C Aircraft Model

10.14311/314 ◽  
2002 ◽  
Vol 42 (1) ◽  
Author(s):  
D. P. Coiro ◽  
F. Nicolosi
Keyword(s):  
Cost Model ◽  
Low Cost ◽  
Aerodynamic Characteristics ◽  
Flight Behavior ◽  
Material Structure ◽  
Aircraft Model ◽  
Lifting Surfaces ◽  
And Performance ◽  
Under Construction ◽  
High Angles Of Attack

Design of a three lifting surfaces radio-controlled model has been carried out at Dipartimento di Progettazione Aeronautica (DPA) by the authors in the last year. The model is intended to be a UAV prototype and is now under construction. The main goal of this small aircraft's design is to check the influence of the canard surface on the aircraft's aerodynamic characteristics and flight behavior, especially at high angles of attack. The aircraft model is also intended to be a flying platform to test sensors, measurement and acquisition systems for research purposes and a valid and low-cost teaching instrument for flight dynamics and flight maneuvering. The aircraft has been designed to fly with and without canard, and all problems relative to aircraft balance and stability have been carefully analyzed and solved. The innovative configuration and the mixed wooden-composite material structure has been obtained with very simple shapes and all the design is focused on realizing a low-cost model. A complete aerodynamic analysis of the configuration up to high angles of attack and a preliminary aircraft stability and performance prediction will be presented.

Next Generation CANDU Performance Assurance

2002 ◽  
Author(s):  
David J. Wren ◽  
P. J. Allsop ◽  
J. M. Hopwood
Keyword(s):  
Product Development ◽  
Large Scale ◽  
Low Cost ◽  
Development Program ◽  
Next Generation ◽  
Customer Expectations ◽  
Generation Plant ◽  
Reliable Performance ◽  
And Performance ◽  
Under Construction

AECL is developing a next generation CANDU design to meet market requirements for low cost, reliable energy supplies. The primary product development objective is to achieve a capital cost substantially lower than the current nuclear plant costs, such that the next generation plant will be competitive with alternative options for large-scale base-load electricity supply. However, other customer requirements, including safety, low-operating costs and reliable performance, are being addressed as equally important design requirements. The main focus of this paper is to address the development directions that will provide performance assurance. The next generation CANDU is an evolutionary extension of the proven CANDU 6 design. There are eight CANDU 6 units in operation in four countries around the world and further three units are under construction. These units provide a sound basis for projecting highly reliable performance for the next generation CANDU. In addition, the next generation CANDU program includes development and qualification activities that will address the new features and design extensions in the advanced plant. To limit product development risk and to enhance performance assurance, the next generation CANDU design features and performance parameters have been carefully reviewed during the concept development phase and have been deliberately selected so as to be well founded on the existing CANDU knowledge base. Planned research and development activities are required only to provide confirmation of the projected performance within a modest extension of the established database. Necessary qualification tests will be carried out within the timeframe of the development program, to establish a proven design prior to the start of a construction project. This development support work coupled with ongoing AECL programs to support and enhance the performance and reliability of the existing CANDU plants will provide sound assurance that the next generation CANDU plants will meet customer expectations.

The Rise of the Hydrofoil and the Displacement of the Hull: The Design, Construction and Performance Measurement of a 6m Flying Catamaran

2003 ◽  
Author(s):  
Edward Chapman ◽  
George Chapman
Keyword(s):  
Low Cost ◽  
Working Hours ◽  
Operating Conditions ◽  
The Other ◽  
Height Control ◽  
Structural Fragility ◽  
Ultimate Failure ◽  
Lifting Surfaces ◽  
And Performance ◽  
Design Construction

The evolution of an all-round 6-metre hybrid displacement/flying day-sailing catamaran is described. A 4.9m prototype was a relatively conventional, but wide, beach-cat type platform with a single fractional rig. Fitted with mechanically incidence-controlled horizontal lifting surfaces beneath the twin daggerboards and a single inverted T rudder, the boat could be sailed in one of three modes: fully displacement with the lifting foils locked in neutral; one hull displacement and the other flying under automatic height control; two hull flying. The small size and structural fragility of the 4.9m boat led to the construction of a 2-man 6m version which, despite being overweight, performs satisfactorily over a wider range of operating conditions than her predecessor. A simple VPP suggested that a second pair of lifting foils with greater area would enlarge the fully oilborne performance envelope upwind, although reducing top speeds on other courses. In practice these foils performed poorly other than on flat water. Other errors contributed to the ultimate failure of one foil-strut assembly, the mode of which is described in detail. Prior to this it was found that operating the foils as stabilisers, i.e. in their active mode but with the hulls in the water, provided a remarkably comfortable, safe and fast ride, particularly upwind in gusty weather. Subsequently, "flying displacement" became the preferred upwind mode, with the original, smaller lifters. Because the author's working hours have limited the opportunity to sail against other similar sized beach cats, instruments to record the boat's performance have been developed. Based around readily available low cost microcontroller technology, the data gathered is processed to identify short, steady periods of sailing. The resulting polar diagrams have compared favourably with predicted performance. Supporting the weight of a boat, as well as resisting roll and pitch moments, through a more subtle combination of dynamic foil lift and hull displacement than presented here provides a continuing opportunity for further developments.

scholarly journals Sukhoi SU-47 Berkut and Eurofighter Typhoon Models Flow Visualization and Performance Investigation Using GAMA Water Tunnel

2019 ◽  
Vol 13 (2) ◽  
pp. 21
Author(s):  
Sutrisno . ◽  
Febryanto Nugroho ◽  
Yogi Adi Pratama ◽  
Sigit Iswahyudi ◽  
Setyawan Bekti Wibowo
Keyword(s):  
Flow Visualization ◽  
Delta Wing ◽  
Angle Of Attack ◽  
Aerodynamic Characteristics ◽  
Water Tunnel ◽  
Swept Wing ◽  
Delta Wings ◽  
Aircraft Wings ◽  
Aircraft Model ◽  
And Performance

Changes and modifications to the wings of fighter aircraft were carried out, one of which was the forward swept wing which was a moderate wing that continues to develop. There were also types of delta wings that had been applied to many fighter planes. Both types of aircraft wings had certainly different aerodynamic characteristics. This research would study the flow visualization that occurs in the aircraft model body to determine the aerodynamic characteristics of the forward swept wing and delta wing. This study used a water tunnel to observe the aerodynamic flow and forces that occurred in both types of wings. This visualization test used similar aircraft models: SU-47 Berkut and Eurofighter Typhoon. The results provided flow visualization, coefficient of lift (Cl), and coefficient of drag (Cd) which showed that the stall that occurred on the aircraft model similar to the SU-47 Berkut occurred at an angle of attack (AoA) 500 with a Cl max value of 2.66. Meanwhile, the Eurofighter Typhoon stall model occurred at an angle of attack 450 with a Cl max value of 1.48.

NUMERICAL AND EXPERIMENTAL INVESTIGATION OF AERODYNAMIC CHARACTERISTICS OF THE HYPERSONIC AIRCRAFT MODEL OF INTEGRATED CONFIGURATION

2013 ◽  
Vol 44 (1) ◽  
pp. 111-127
Author(s):  
Sergey Mikhailovich Zadonsky ◽  
Alexander Petrovich Kosykh ◽  
Garry Grantovich Nersesov ◽  
Iraida Fedorovna Chelysheva ◽  
Sergey Valer'evich Chernov ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Aerodynamic Characteristics ◽  
Aircraft Model ◽  
Hypersonic Aircraft

Programmable Integrated Photonics

2020 ◽  
Author(s):  
José Capmany ◽  
Daniel Pérez
Keyword(s):  
Integrated Circuit ◽  
Performance Monitoring ◽  
Low Cost ◽  
Limiting Factors ◽  
External Control ◽  
Integrated Photonics ◽  
New Paradigm ◽  
Photonic Integrated Circuit ◽  
And Performance ◽  
Application Fields

Programmable Integrated Photonics (PIP) is a new paradigm that aims at designing common integrated optical hardware configurations, which by suitable programming can implement a variety of functionalities that, in turn, can be exploited as basic operations in many application fields. Programmability enables by means of external control signals both chip reconfiguration for multifunction operation as well as chip stabilization against non-ideal operation due to fluctuations in environmental conditions and fabrication errors. Programming also allows activating parts of the chip, which are not essential for the implementation of a given functionality but can be of help in reducing noise levels through the diversion of undesired reflections. After some years where the Application Specific Photonic Integrated Circuit (ASPIC) paradigm has completely dominated the field of integrated optics, there is an increasing interest in PIP justified by the surge of a number of emerging applications that are and will be calling for true flexibility, reconfigurability as well as low-cost, compact and low-power consuming devices. This book aims to provide a comprehensive introduction to this emergent field covering aspects that range from the basic aspects of technologies and building photonic component blocks to the design alternatives and principles of complex programmable photonics circuits, their limiting factors, techniques for characterization and performance monitoring/control and their salient applications both in the classical as well as in the quantum information fields. The book concentrates and focuses mainly on the distinctive features of programmable photonics as compared to more traditional ASPIC approaches.

The Use of Microcomputer Simulations in Undergraduate Neurophysiology Experiments

1987 ◽  
Vol 14 (3) ◽  
pp. 134-140 ◽  
Author(s):  
K.A. Clarke
Keyword(s):  
Low Cost ◽  
Animal Experiments ◽  
Theoretical Background ◽  
General Purpose ◽  
Microcomputer System ◽  
Laboratory Equipment ◽  
Teaching Objectives ◽  
Compound Action Potentials ◽  
Experimental Management ◽  
And Performance

Practical classes in neurophysiology reinforce and complement the theoretical background in a number of ways, including demonstration of concepts, practice in planning and performance of experiments, and the production and maintenance of viable neural preparations. The balance of teaching objectives will depend upon the particular group of students involved. A technique is described which allows the embedding of real compound action potentials from one of the most basic introductory neurophysiology experiments—frog sciatic nerve, into interactive programs for student use. These retain all the elements of the “real experiment” in terms of appearance, presentation, experimental management and measurement by the student. Laboratory reports by the students show that the experiments are carefully and enthusiastically performed and the material is well absorbed. Three groups of student derive most benefit from their use. First, students whose future careers will not involve animal experiments do not spend time developing dissecting skills they will not use, but more time fulfilling the other teaching objectives. Second, relatively inexperienced students, struggling to produce viable neural material and master complicated laboratory equipment, who are often left with little time or motivation to take accurate readings or ponder upon neurophysiological concepts. Third, students in institutions where neurophysiology is taught with difficulty because of the high cost of equipment and lack of specific expertise, may well have access to a low cost general purpose microcomputer system.

Sign in / Sign up

Export Citation Format

Share Document