Although theoretical tools for the design of winglets for lowspeed aircraft were initially of limited value, simple methods were used to design winglets that gradually became accepted as benefiting overall aircraft performance. Theyre called winglets, and their purpose is to reduce turbulence at the tips of an airplanes wings. Multidisciplinary design and optimization for high speed, high. Maughmer born january 18, 1950 is a professor of aerospace engineering in the.
Although theoretical tools for the design of winglets for. Understanding the benefits of blended winglets requires knowledge of the following. Clark maughmer m, 75 kingston, oh background report at. A freewake vortex analysis method was used by maniaci and maughmer 2012 for the design of rather large downstreamfacing winglets with a height of 8% of the rotor radius.
Xxxiii ostiv congress congress program and proceedings. Design of parametric winglets and wing tip devices. May 22, 2012 american institute of aeronautics and astronautics 12700 sunrise valley drive, suite 200 reston, va 201915807 703. Buttressed by his academic research, maughmer s design work with sailplane racing pilot peter masak in the late 1980s and early 1990s literally revolutionized the shape of gliders by making winglets standard equipment. For more information on winglets, we refer to the following articles. Kunz the pennsylvania state university, university park, pennsylvania presented at the xxv ostiv congress, saint auban, france summary although the accuracy of methods for the design and analysis of winglets has been limited, the performance gains achieved through their use are now well established. Sixclaws is a happy and industrious sandwing, always working hard and loyally for his queen.
The mass of one winglets is limited to 0,28 0,04 kg 0. Others had attempted to apply whitcombs winglets to gliders before, and they did improve climb performance, but this did not offset the. Home multidisciplinary design and optimization for high speed, high efficiency tiltrotors with wing extensions and winglets. They are now a familiar sight to nearly every soaring pilot. Select from a variety of bestselling titles to enhance your guided reading program. Aerodynamic analysis of blended winglet for low speed.
One person that did was the late jack morrison, who added blended winglets to his beautiful eracer and then claimed a 10 knot speed. The optimization studies reveal that the ld of the optimum design is 12%. In 1987, mechanical engineer peter masak called on mark d. The idea behind the winglet is to reduce the strength of the tip vortex and therefore cause the flow across the wing to be more twodimensional. The design and testing of a winglet airfoil for lowspeed aircraft.
Problem induced drag produced by 3 d airflow around wing tips. Addon winglets are also custom made for many types of aircraft. Sutherland is the author of several books for young readers, including the menagerie trilogy, the pet trouble series, and three books in the bestselling seekers series as part of the erin hunter team. Sutherland born july 31, 1978 in caracas, venezuela is a venezuelanamerican childrens book author who has also written under the pen name heather williams.
They may have benefits for non turboprop planes as well but i know on the tradewinds the winglets tend to be a common place for cracking where they connect to the tip tank. Winglets are one of the most successful examples of a nasa aeronautical innovation being utilized around the world on all types of aircraft. Maughmer is involved in the design, analysis, and windtunnel testing of airfoils. A comparative study between winglet and raked wingtip.
A winglet is a canted extension to the wingtip that diffuses the swirl of air around it with the goal of reducing overall drag. Increasing the wing by 45 of the height of winglets will have the same effect as having a winglet. Winglets are strong enough for slips to final and increase the safety as the glider is less likely to spin with the winglets, especially earlier generation models like the asw20 and ventus. Maughmer born january 18, 1950 is a professor of aerospace engineering in the department of aerospace engineering at the pennsylvania state university. A wing structural model for strength and wing weight predictions. He is a widely published author known throughout the world as one of the leading aerodynamicists, especially in the areas of airfoil and winglet design and analysis, wing optimization, natural laminar flow aerodynamics, and subsonic. Maughmer over the past ten years, from initially being able to do little to improve overall sailplane performance, winglets have developed to such an extent that few gliders leave the factories without them. Problem induced drag produced by 3d airflow around wing tips.
The change in mass for the new winglets are so small and so close to the in flight c. Maughmer, the pennsylvania state university university park, pennsylvania 16802 5an experimental study on wingtip devices for agricultural aircraft,rogerio f. Maughmer, an associate professor of aerospace engineering, about designing winglets to improve performance on his 15meter wingspan racing sailplane. The air pressure on the bottom of a wing is greater than the pressure on top, so when air. In 1987, peter masak called on maughmer about designing winglets for his sailplane to improve performance. Winglets reduce wingtip vortices, the twin tornados formed by the difference between the pressure on the upper surface of an airplanes wing and that on the lower surface. Maughmer news newspapers books scholar jstor may 2019 learn how and when. In the short story winglets series, fans will meet old friends and new enemies, uncover shocking secrets, and learn more about the terrible challenges that will test all dragonkind. Fans of the new york times bestselling wings of fire series wont want to miss this allnew story set in the dangerous a. The big manufacturers explored offering winglet retrofit kits to their customers but at the time, it wasnt economical since fuel was so cheap. Few builders have experimented with blended winglets because it requires structural and aerodynamic changes to the wing. May 05, 2015 the winglets were attached to a 172 scale model of a cessna 172.
Nasa photo ec7911481 winglets are vertical extensions of wingtips that improve an aircrafts. Blended winglets were invented after burt rutan exited the homebuilt aircraft business. Winglets book series 4 books all formats kindle edition from book 1. Fans of the new york times bestselling wings of shelve deserter. He is also exploring methods for the design and analysis of planar and nonplanar wing geometries, as well as winglets, for achieving minimum overall drag. Our guided reading 6book sets help you tailor your instruction to meet individual and smallgroup interests and needs.
Comparisons of theoretical methods for predicting airfoil. Department of aerospace engineering, pennsylvania state university, university park, pennsylvania. Citeseerx the design of winglets for lowspeed aircraft. Mark palmer adelaide, south australia, australia level. Citeseerx document details isaac councill, lee giles, pradeep teregowda.
American institute of aeronautics and astronautics 12700 sunrise valley drive, suite 200 reston, va 201915807 703. Clark maughmer is 75 years old and was born on 04231945. Design and testing of a winglet airfoil for lowspeed aircraft. Operational reynolds number range of winglet airfoil and range of windtunnel tests. Maughmer, an associate professor of aerospace engineering at the pennsylvania state university, about designing winglets to improve performance on his 15meter 49 ft wingspan racing sailplane.
A short, almost vertical stabilizing fin projecting from the tip of an aircraft wing. Maughmer has made himself known in the aviation world for his contribution to winglets on sailplanes 57. Maughmer honored with distinguished alumnus award may 31, 2019 debra levey larson as a senior in 1972 at the university of illinois in the department of aerospace engineering, mark maughmer was forced to make a choice. Nasa photo ec7911481 winglets are one of the most successful examples of a nasa aeronautical innovation being utilized around the world on all types of aircraft. Maughmer the pennsylvania state university university park, pennsylvania 16802 abstract although theoretical tools for the design of winglets for highperformance sailplanes were initially. As a result, a large part of winglet design development still involves timeconsuming wind tunnel and flight test trials, unless a firm has access to specialized aerodynamic computer software. In 1987, mechanical engineer peter masak called on aerodynamicist mark d. Aerodynamic analysis of blended winglet for low speed aircraft. Design of winglets for highperformance sailplanes journal. In brief, winglets reduce the drag produced by the confluence of the airflow on the upper and lower surface of the wing where they meet the tip.
What do winglets do to increase aircraft performance. Sutherland, author of the bestselling currently reading. Winglets also are available for retrofit on inservice airplanes. Pdf numerical analysis of winglets on wind turbine blades. Five different winglet configurations were wind tunnel tested in may, 2014, by austin vorisek, a graduate of solon high school, who will be attending ohio state university in the fall of 2014, and alex mann, a graduate of orange high school, who will be attending akron univerity. Others had attempted to apply whitcombs winglets to gliders before, and they.
Winglets were wind tunnel tested and computer analyzed by richard whitcomb of the nasa langley research center in the mid 1970s. The 8ft, carbon graphite winglets allow an airplane to extend its range, carry as much as 6,000 lb more payload from takeofflimited airports, and save on fuel. The wing cutting equipment about to be described was designed and built by mr. Flight tests at the nasa dryden flight research center have found a 6. His winglet designs are on hundreds of production sailplanes. So when the youngest sandwing princess, blaze, wanders off during a sandstorm, sixclaws doesnt think twice before trying to rescue her. Kambampati, taylor hoover, edward smith, mark david maughmer aerospace engineering. Its construction was undertaken in order to meet the longfelt necessity for a means of producing metal wings for wind tunnel tests which would be accurate and fair, and yet within a price commensurate with the value of a model wing test. Typically the winglets are installed on the tradewinds bonanza to stabilize the flight at higher altitudes. Boeing chose to increase the span of the wing rather than add winglets. Fans of the new york times bestselling wings of fire series wont want to miss this allnew story set in the dangerous world of dragons. Over the past ten years, from initially being able to do little to improve overall sailplane performance, winglets have developed to such an. Pdf design and testing of a winglet airfoil for lowspeed aircraft.
Multidisciplinary design and optimization for high speed, high efficiency tiltrotors with wing extensions and winglets sandilya kambampati, edward smith, mark maughmer, taylor hoover, penn state may 17, 2016. Winglet technology, llc, a wichita kansas based company, designs, certifies and markets the most innovative winglets in the world. The penn state professor is only half kidding when he pulls the book from a pile on his desk. The popularity of winglets, though, continues to grow. This conjunction of air at the tip forms a vortex that trails behind the aircraft and creates drag. Multidisciplinary design and optimization for high speed. The results of mark maughmers high school aptitude test dictated he should be an artist, but his. Winglets 4 book series essay and need some advice, post your tui t. In a study in 1987 by mark maughmer in collaboration with peter masak on winglet. Winglets synonyms, winglets pronunciation, winglets translation, english dictionary definition of winglets. Maughmer, published june 2002 soaring magazine view pdf the design of winglets for lowspeed aircraft by mark d. Large for highlift, low speed flight conditions 50% of total drag for subsonic transports opperating at high subsonic speeds. Winglets closeup of winglet on kc5 test aircraft, with attached tufts displaying flow of air over winglet surface. Winglets had been tried before on gliders but without success, and the common.
Winglets makes the passage of air from the bottom of the wing to the lower pressure top of the wing more difficult, thus reducing induced drag. High pressure on the lower surface creates a natural airflow that makes its way to the wingtip and curls upward around it. Some aircraft are designed and manufactured with sleek upturned winglets that blend smoothly into the outer wing sections. By increasing the wingspan, it also increases wing efficiency. Yankee composites offers winglet retrofitting and winglet kits for selected sailplane models. Borrow ebooks, audiobooks, and videos from thousands of public libraries worldwide. Our patented elliptical winglet provides industrybest performance.
For many years, and in many text books, you may have read. Bachelor thesis department of automotive and aeronautical. Why the airbus a380 does not have winglets similar to the. Other names that clark uses includes clark m maughmer and clark m maughner. Numerical analysis of winglets on wind turbine blades. The pennsylvania state university, university park, pennsylvania 16802. Page asw 27 alexander schleicher technical note no. Winglets definition of winglets by the free dictionary. Winglets, in all forms and shapes, have become a standard feature in sailplane design. Winglets wont work with some airfoils, and theyre only marginally effective on others.
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