The Akaflieg Darmstadt D-17 Darmstadt , also called the Darmstadt D-17 and Darmstadt I , was a high performance, single seat, cantilever monoplane sailplane , designed and built by a German University student design group in 1927. It was followed in 1928 by the Akaflieg Darmstadt D-19 Darmstadt 2 , a similar aircraft with a new profile, longer span wing.
18-413: D17 , or similar, may refer to: Vehicles [ edit ] Aircraft [ edit ] Akaflieg Darmstadt D-17 Darmstadt , a German sailplane Beechcraft D17S Staggerwing , an American biplane Fokker D.XVII , a Dutch biplane Ships [ edit ] Brazilian destroyer escort Beberibe (D17) , a Cannon -class destroyer escort of
36-454: A tailslide , from an aerodynamic point of view, the trailing edge becomes the leading edge and vice versa but from a structural point of view the leading edge remains unchanged. The structural leading edge may be equipped with one or more of the following: Associated terms are leading edge radius and leading edge stagnation point . Seen in plan the leading edge may be straight or curved. A straight leading edge may be swept or unswept,
54-528: A French digital television channel, now CStar D-17B , an early computer used in missile guidance systems Dublin 17 , a postal district in Ireland Lipoma , a benign tumor of adipose tissue D17 series of Honda D engines [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with the same title formed as a letter–number combination. If an internal link led you here, you may wish to change
72-557: The Technical University of Darmstadt was first formed in 1921. It was, and is, a group of aeronautical students who design and construct aircraft as part of their studies and with the help and encouragement of their University. By 1927 the group were producing a range of designs traceable back to their 1923 Konsul and some of these were professionally built outside the University. The D-17, originally known simply as
90-601: The keel , moving in a cut-out in the one piece elevator . In 1928 a close relative of the D-17, the D-19 Darmstadt 2, was flown. Designed by F. Gross, the main difference between it and the D-17 was the wing which had a 2 m (6 ft 7 in) greater span, making the D-19 an 18 m (59 ft 1 in) sailplane. The central panel span was increased to 7.62 m (25 ft). The D-19's wing area
108-517: The 1927 Rhön ( Wasserkuppe ) gliding competitions. Piloted by Johannes Nehring, it set a new hill soaring distance record at 51.8 km (36.1 mi). In early 1928 it went to the United States where Peter Hesselbach flew it over the dunes of Cape Cod , one flight lasting four hours. The flights attracted much publicity and caught the attention of the young Schweizer brothers who later became important glider designers. The Darmstadt
126-743: The Brazilian Navy HMS ; Alamein (D17) , a Battle-class destroyer of the Royal Navy HMS ; Quadrant (D17) , a Q-class destroyer of the Royal Navy HMS Ulysses (D17) , a U-class destroyer of the Royal Navy Surface vehicles [ edit ] Allis-Chalmers D17 , an American tractor LNER Class D17 , an English 4-4-0 steam locomotive class Queensland D17 class locomotive , an Australian 4-6-4T steam locomotive Other uses [ edit ] D17 (TV channel) ,
144-546: The Darmstadt and later as the Darmstadt 1, was one such. The D-17 was a wood framed aircraft with a high , cantilever, single spar wing with stressed plywood covering from the spar to the leading edge and fabric covered aft. Its 16 m (52 ft 6 in) was built in three parts, a 6 m (19 ft 9 in) inner section with constant chord and thickness and outer panels which tapered in both chord and thickness to elliptical tips . The D-17 had
162-445: The flow is desirable since 90% of the drag on a sailboat owing to sails is a result of vortex shedding from the edges of the sail. Sailboats utilize a mast to support the sail. To help reduce the drag and poor net sail performance, designers have experimented with masts that are more aerodynamically shaped, rotating masts, wing masts, or placed the mast behind the sails as in the mast aft rig . This aviation -related article
180-430: The junior endurance prize with a flight of 3 hr 19 min, was another Akaflieg Darmstadt model, but if It was the D-17, then two of the latter were built. The D-19 appeared at least three consecutive Rhön meetings (1928–30), setting a record of 71.2 km (44.3 mi) in 1928 then bettering it with 72.3 km (44.9 mi) the following year. It appeared there for the last time in 1934, after which it
198-482: The latter meaning that it is perpendicular to the longitudinal axis of the aircraft. As wing sweep is conventionally measured at the 25% chord line an unswept wing may have a swept or tapered leading edge. Some aircraft, like the General Dynamics F-111 , have swing-wings where the sweep of both wing and leading edge can be varied. In high-speed aircraft, compression heating of the air ahead of
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#1732779595428216-439: The link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=D17&oldid=1132528975 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Akaflieg Darmstadt D-17 Darmstadt The Akademische Fliegergruppe of
234-454: The tail. The open, unscreened cockpit was placed immediately ahead of the wing leading edge with the pilot's head against the front of a low, long chord, faired pylon which supported the wing. A short undercarriage skid was attached to the fuselage underside, aided by a small tailskid. The D-17 had all moving tail surfaces with straight edges, rounded tips and tapered by forward sweep on their trailing edges . The large rudder extended to
252-464: The thick, high lift to drag ratio Göttingen 535 profile that Akaflieg had first used on the Konsul. Ailerons mounted on slightly angled hinges occupied the whole trailing edges of the outer panels. No flaps , airbrakes or spoilers were fitted, normal for the time. The fuselage of the Darmstadt was a plywood skinned, oval cross sectioned semi- monocoque , slightly tapered and more rounded towards
270-509: The wings can cause extreme heating of the leading edge. Heating was a major contributor to the destruction of the Space Shuttle Columbia during re-entry on February 1, 2003. When sailing into the wind, the dynamics that propel a sailboat forward are the same that create lift for an airplane. The term leading edge refers to the part of the sail that first contacts the wind. A fine tapered leading edge that does not disturb
288-678: Was damaged in a collision with a flagpole at the Cape, then was sold and rebuilt with improvements to the cockpit including its enclosure under smooth glazing which merged into the upper pylon line. Renamed the Chanute in honour of the aviation pioneer Octave Chanute , it was mostly flown by Jack O'Meara. Flight reported that a Darmstadt, as well as a Darmstadt 2, flew at the Rhön meeting in August 1930. The quoted span suggests this Darmstadt, which won
306-402: Was lost during a Scandinavian tour. Data from Sailplanes 1920-1945 General characteristics Performance Leading edge The leading edge is the part of the wing that first contacts the air; alternatively it is the foremost edge of an airfoil section. The first is an aerodynamic definition, the second a structural one. As an example of the distinction, during
324-455: Was only slightly higher, with the result that the aspect ratio was increased from 15.4 to 19.4. The D-19 used a more symmetric Joukowsky profile in place of the strongly cambered Göttingen 535, so decreasing the pitching moment; over the outer panels the thickness/chord ratio reduced continuously from 15% to 8. There were also smaller refinements around the cockpit and pylon and a deeper, less rounded fuselage profile. The D-17 took part in
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