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Monday, July 27, 2020 | History

4 edition of Range and endurance optimization of a sailplane gliding through atmospheric turbulence found in the catalog.

Range and endurance optimization of a sailplane gliding through atmospheric turbulence

Keiichi Ito

Range and endurance optimization of a sailplane gliding through atmospheric turbulence

by Keiichi Ito

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Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.Sc.) -- University of Toronto, 1998.

SeriesCanadian theses = -- Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches : negative. --
ID Numbers
Open LibraryOL19268031M
ISBN 100612408981
OCLC/WorldCa51087507

Prof. Newman, Page 16 Examples •Example , pg. 90, V-n Simulation •Problem Calculate the thrust required for an aircraft, modeled after a Canadair. The numerical optimization of a sailplane wing is a real challenge to put in equations and figures. Contrary to airliners that are designed for a single cruise condition, sailplanes are flown over a large range of speed and lift coefficients. Thus, a relevant performance figure is more difficult to define for sailplanes.

  Multi-Disciplinary Design Optimization of Subsonic Fixed Wing Unmanned Aerial Vehicles Projected Through pdf road map for uav in south tailless plane longitudinal technology devlopment for low cost uav mod uav team shadow prude university.p click here to view files as per list. the glider is evaluated through the k-є turbulence model. COMPUTATIONAL DOMAIN The fluid domain across the glider is generated based on that recommended in the literature. ITTC [9] recommended that for the fluid domain for surface vehicles, the upstream location should be times Lglider from the glider and downstream boundary should be

The green glider is flying at Minimum Sink Speed, the yellow glider at Best Glide Speed (also called best L/D Speed because the glide ratio in still air is numerically equal to the ratio of lift to drag), and the red glider is flying at the Speed to Fly for a SGS flying in .   “The hardest part was getting into the wave because we had to go through a lot of turbulence that stressed the glider to around 5 g's. But once we connected with the wave, the air .


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Range and endurance optimization of a sailplane gliding through atmospheric turbulence by Keiichi Ito Download PDF EPUB FB2

Range and endurance optimization of a sailplane gliding through atmospheric turbulence Article (PDF Available) January with 40 Reads How we measure 'reads'Author: Keiichi Ito. Gliding for range, flattest glide, is at max L/D speed for the weight, which also affected by the wind's effect on "effective" L/D or glide angle relative to ground covered.

If you were in the volcanic eruption scenario, it's the speed you'd wished you'd flown at as you realize you could have cleared the lava field if you'd sped up to best.

Range mi mi Endurance (TOF) min min As expected, max range conditions give biggest range, and max endurance conditions give max TOF. In addition we could have selected a specified L/D.

For the case of L/D = 10 we obtain the following results: L/D = 10, Range = mi Endurance: TOF1 = min, or TOF2 = minFile Size: KB. Range and Endurance OptiaÛmtioa d a Gliding Tbrwgh Atmorpbcnc Turbuknce MASc- Kciichi Ito Graduate Departmat of Aerospace Science and Engineering University of Toronto hâme for Aerospace Studies Abstract This research was conducteâ to numerically investigate the effkct of atmospheric turbulence in sailplane design.

A Schieicher ASK 23 was employed as a base : Keiichi Ito. the glider. A glider flying at 60 knots true airspeed with a tailwind of 25 knots has a groundspeed of 85 knots. Crosswinds during cruising flight cause glider heading (the direction in which the glider nose is pointed) and glider track (the path of the glider over the ground) to diverge.

In a glider, it must be remembered that crosswinds have someFile Size: 2MB. Defining AUV gliding angle Θ and wing’s coefficient of ex-range efficiency C ew as follows: (6) Θ = α-Θ B (7) C ew = 1 / (S w tan Θ) with gliding distance in horizon (8) R X = C ew S w H then the variation of gliding angle Θ with the change of α set and S w is plotted in Fig.

8, which indicates that an optimal exists for each area wing. It can be simply proved that maximum glide range in still air is achieved by gliding at the best lift/drag ratio angle of attack [about 4°] for most GA type wings - page (92) of my Aerodynamics book.

Range and endurance optimization of a sailplane gliding through atmospheric turbulence effect of atmospheric turbulence in sailplane design. endurance optimization of a sailplane gliding. The best speed for range corresponds to an angle of attack which gives the best lift-to-drag ratio.

Any change in the gliding airspeed will result in a proportionate change in glide ratio. At any speed, other than the best glide speed, the glide ratio will change. When descending at a speed less than the best glide speed, induced drag increases.

Range and endurance optimization of a sailplane gliding through atmospheric turbulence K Ito National Library of Canada= Bibliothèque nationale du Canada, The gliding range, R, corresponds to the longest distance traveled along the ground during the glide descent.

Assuming an initial altitude, h 1 and a ground altitude, h 2, it can be calculated from R= h 1 h 2 tan 1 = L D (h 1 h 2): (4) Here the ratio L=Dis also called "gliding ratio". Gliding endurance consists of achieving the longest duration. the pressure exerted by the atmosphere is due to its weight.

Therefore, pressure is measured in terms of weight per area. For example, atmospheric pressure is measured in pounds per square inch (lb/in2). From the outer atmosphere to sea level, a typical value of atmospheric pressure is lb/in2.

In this paper, gliding range of the Petrel-L underwater glider is increased by optimizing the motion parameters according to different observation missions.

The optimization is established to maximize the gliding range and minimize the energy consumption for one gliding cycle, which is solved by the inner penalty function method (IPFM). A glider or sailplane is a type of glider aircraft used in the leisure activity and sport of gliding (also called soaring).

This unpowered aircraft can use naturally occurring currents of rising air in the atmosphere to gain altitude.

Sailplanes are aerodynamically streamlined and so can fly a significant distance forward for a small decrease in altitude. Gliding. Presentation Aims •Recognise the convergence of interest - Limited endurance remains an issue at least for electric power in the short term.

- High efficiency design enables greater use of available energy in the atmosphere through areas of ‘good air’. Gliding flight is heavier-than-air flight without the use of thrust; the term volplaning also refers to this mode of flight in animals.

It is employed by gliding animals and by aircraft such as mode of flight involves flying a significant distance horizontally compared to its descent and therefore can be distinguished from a mostly straight downward descent like with a round.

Two-way communication is then established through the Iridium satellite telemetry, or with a FreeWave MHz radio, when the glider is within range of the antenna. The glider is fitted with a neutrally buoyant, low-power, self-contained turbulence instrument package MicroRiderLP (MR), manufactured by Rockland Scientific International.

Fuselage lengths range from 20 to 30 feet. And the empty weight of the glider may be as little as pounds, or nearly pounds for a glider that can carry three people. New, factory-built sailplanes may cost $50, to over $, or more depending on performance, construction, and equipment.

Endurance Equation (10) Range In a similar manner, we can rearrange Eq. (5) to get the range equation: Range Equation (11) Integration of the Endurance and Range Equations In order to integrate the above equations, we need to know how the variables in the integrand vary with the integral independent variable weight.

That is, we need to know ctDasa. Foot Launch Sailplane. Wing Optimization. Presented by: Constantin Nicolinco Ahmad Kalaji Introduction Sailplanes: aircrafts without engines Launched via aero tow, winch, slingshot, or even automobile tow.

Introduction Most Sailplanes optimized for cross country soaring Narrow and slender wings, low drag, but high take-off speed. Maupin Carbon Dragon Developed in the late 80s Designed.

When gliding is required, the glider’s propeller folds to reduce the gliding resistance. The UG research in China started in the early twenty-first century. It is designed to achieve the cruise speed of 1–3 knot and can realize the gliding range of – km, and be able to remain on-station up The long endurance (1 month, Close Drawer Menu Close Drawer Menu Menu.

Home; Journals. AIAA Journal; Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of .Generally, a minute flight will result after the sailplane releases from a foot aero tow, when no rising air currents are found to extend the flight.

The pilot in the sailplane can achieve a longer flight if the air mass in which he is flying is rising at a faster rate than the sailplane is gliding downward.