| 词条 | Glaser-Dirks DG-300 | |||||||||||||||
| 释义 |
The Glaser-Dirks DG-300 is a Standard Class single-seat high-performance glider built of glass-reinforced plastic. The DG-300 was designed by Wilhelm Dirks and manufactured by Glaser-Dirks Flugzeugbau's Slovenian partner company Elan (company). A total of 511 of all versions were built since production started in 1983. Representative contemporary types from competing manufacturers are the Rolladen-Schneider LS4 and the Schempp-Hirth Discus. Design and developmentThe DG-300 has a flapless wing with triple taper based on the Falcon designed by Hansjörg Streifeneder, and employs the HQ 21/II, a relatively thick profile (ca. 17.5%). This wing is 'blown' on the underside by 900 small holes to achieve a controlled transition from laminar to turbulent flow without additional drag. However, these holes are prone to clogging due to dirt, moisture and wing surface polishing, which makes them less effective over time. As with any racing glider, the thickness of the wing makes it relatively sensitive to performance degradation due to contamination by insect impacts or rain drops. It is agile and a good climber, but slightly underperforms compared to its competitors in cruising flight, especially at higher speeds. The later DG-303 version with a new wing profile and winglets was developed that delivers higher performance at low to medium speeds plus increased aileron response. A fully aerobatic version (the Acro) was also sold, stressed for +7/-5g. The DG-300 has typical DG features, which improve comfort and safety if at a performance cost. It has the large cockpit typical of DG giving excellent comfort, especially in high-altitude flight where the full-length canopy allows the feet to be warmed by sunlight. The view from the cockpit is superb, adding to the pleasure and safety of flight. After the bankruptcy of Glaser-Dirks the newly founded DG Flugzeugbau GmbH took over the servicing of these gliders. The operational limits were changed on April 2007 after a defect was detected on the main spar which affects unknown number of gliders. Aerobatic flight since then is not permitted, even for the Acro versions unless the spar is inspected for defect and repaired. Major features
Variants
Initial production version
With fixed undercarriage for club use
Fully aerobatic (restricted from aerobatic flight after 2007,unless you let DG do a resurge of the wing)
With a new aerofoil section and optional winglets; available in standard, club and acro versions, built by the Slovenian company AMS-Flight until end of 2006 Specifications (DG-303 Elan){{aerospecs|ref= |met or eng?=met |crew=One |capacity={{convert|130|kg|lb|0|abbr=on}} water ballast |length m=6.80 |length ft=22.3 |length in=4 |span m=15.00 |span ft=49 |span in=2 |swept m= |swept ft= |swept in= |rot number= |rot dia m= |rot dia ft= |rot dia in= |dia m= |dia ft= |dia in= |width m= |width ft= |width in= |height m=1.39 |height ft=4 |height in=6 |wing area sqm=10.3 |wing area sqft=110.5 |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3= |volume ft3= |aspect ratio=21.9 |airfoil=Horst & Quast HQ21/II |empty weight kg=238 |empty weight lb=525 |gross weight kg=500 |gross weight lb=1,102 |lift kg= |lift lb= |eng1 number= |eng1 type= |eng1 kw= |eng1 hp= |eng1 kn= |eng1 lbf= |eng1 kn-ab= |eng1 lbf-ab= |eng2 number= |eng2 type= |eng2 kw= |eng2 hp= |eng2 kn= |eng2 lbf= |eng2 kn-ab= |eng2 lbf-ab= |max speed kmh=270 |max speed mph=167 |max speed mach= |cruise speed kmh= |cruise speed mph= |range km= |range miles= |endurance h= |endurance min= |ceiling m= |ceiling ft= |glide ratio=42 |climb rate ms= |climb rate ftmin= |sink rate ms=0.59 |sink rate ftmin=115 |IGC club class Handicap=100 |armament1= |armament2= |armament3= |armament4= |armament5= |armament6= }} See also{{aircontent|see also= |related= |similar aircraft=
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}} Sources{{commons category|DG-300}}
2 : German sailplanes 1970–1979|DG Flugzeugbau aircraft |
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