| 词条 | Rolladen-Schneider LS2 | |||||||||||||||
| 释义 |
The Rolladen-Schneider LS2 is a 15-metre span single seat glider prototype with trailing edge air brakes, designed and built by Rolladen-Schneider Flugzeugbau GmbH c. 1973. The LS2 was designed by Wolf Lemke and Walter Schneider in response to changes in the Standard Class rules. A single experimental prototype was built. First flown in 1973, it won the German Championships that year and went on to win the World championships in Australia in 1974. DesignThe design was nevertheless unsatisfactory. The air brakes occupied most of the trailing edge of the wing, being intended also as a means to lower speeds and improve climb rates in thermals. Class rules did not allow these surfaces to be coupled to the ailerons. The resultant sluggish roll rate from the very short ailerons led to poor and unsafe flying characteristics. Thrice World Champion Helmut Reichmann reportedly said the performance advantages were not worth the extra pilot workload. The LS2 highlighted inconsistencies in the rules that promoted unwise design trends, with trade-offs having to be made by designers between competitiveness and safety. Many observers also felt that trailing edge air brakes were against the spirit of the Standard Class, an issue that affected other types such as the PIK-20, Libelle and Schreder HP-8. The International Gliding Commission voted a new set of rules in 1974, prohibiting any lift-enhancing devices in the Standard Class and creating the 15 metre Class where these were allowed without any restriction. Specifications{{aerospecs|ref= |met or eng?=met |crew=One |capacity= |length m=6.80 |length ft=22 |length in=4 |span m=15.00 |span ft=49 |span in=3 |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= |height ft= |height in= |wing area sqm=10.3 |wing area sqft=111 |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3= |volume ft3= |aspect ratio= |empty weight kg=ca. 240 |empty weight lb=530 |gross weight kg=360 |gross weight lb=790 |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= |max speed mph= |max speed mach= |cruise speed kmh= |cruise speed mph= |range km= |range miles= |endurance h= |endurance min= |ceiling m= |ceiling ft= |glide ratio=40 |climb rate ms= |climb rate ftmin= |sink rate ms=0.65 |sink rate ftmin=128 |armament1= |armament2= |armament3= |armament4= |armament5= |armament6= }}{{aircontent |see also= |related= |similar aircraft= |lists= }} References{{commons category|Rolladen Schneider}}
2 : German sailplanes 1970–1979|Rolladen-Schneider aircraft |
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