| 词条 | Schweizer SGS 1-29 | |||||||||||||||
| 释义 |
The Schweizer SGS 1-29 is an American single-seat, mid-wing, experimental laminar flow airfoil glider built by Schweizer Aircraft of Elmira, New York.[3] The 1-29 is a development of the Schweizer SGS 1-23 that utilizes a 1-23 fuselage and a newly constructed set of 49.2 foot (15.0 m) span wings.[1][3] The aircraft was constructed to study the feasibility of producing improved boundary layer laminar flow on a metal-winged sailplane. Only one SGS 1-29 was produced and the project was not pursued further.[1][2][3] BackgroundIn the mid-1950s the SGS 1-23 was in full production and through successive models was performing very well in competition. By 1957 the development of fiberglass-reinforced plastic affected the production of many sporting goods, such as boats and fishing rods. Schweizer Aircraft thought it was only a matter of time before a fiberglass sailplane was produced. This concern was borne out in 1965, when two German fiberglass sailplanes were entered in the world championships.[2] Schweizer Aircraft evaluated the use of fiberglass for sailplane construction and rejected it for several reasons:[2]
The company decided to concentrate on getting the best performance from the material that it knew best, aluminum.[2] Schweizer created several design studies of new sailplanes in the mid-1950s. These included:[2][4]
Of these, only the SGS 1-29 proceeded to prototype stage.[2][3] Design and developmentThe 1-29 was constructed using a modified SGS 1-23G fuselage. New wings were built for the aircraft to determine if better laminar flow could be achieved on a metal wing.[1][3] The wings were all-metal and of constant chord. The wing ribs were identical and created from a single master die to ensure uniformity. The wing features a thick, deep spar to reduce wing flexing and "oil-canning" that might interrupt laminar flow. The wing was assembled using flush rivets and has balanced top and bottom dive brakes.[1][3] The aircraft first flew in 1958 and flight testing was reported by Schweizer Aircraft as on-going through 1959.[2] The 1-29 program did yield positive results. The standard production model SGS 1-23H-15 with the same fuselage and wingspan as the 1-29 and a NACA 43012A airfoil, produced a best glide ratio of 29:1. With its laminar flow wing and NACA 63-618 airfoil the 1-29 recorded a 34:1 glide ratio, an improvement of 15%.[3] The 1-29 design was never certified and the sole aircraft that was built is an experimental aircraft in the "racing, exhibition" class and registered as N3898A.[3][5] Operational historyThe 1-29 was flown in at least three US national competitions by Paul A Schweizer, Bill Ivans and Tom Smith.[3] Aircraft on displayOnce the 1-29 test program was complete, the aircraft was donated to the National Soaring Museum where it is currently listed as being in storage.[6] Specifications{{aerospecs|ref= |met or eng?=eng |crew=One |capacity= |length m= |length ft= |length in= |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=15.3 |wing area sqft=154 |swept area sqm= |swept area sqft= |rot area sqm= |rot area sqft= |volume m3= |volume ft3= |aspect ratio=15.75 |wing profile=NACA 63-618 |empty weight kg=224 |empty weight lb=465 |gross weight kg=340 |gross weight lb=750 |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=34 at 52 mph (83 km/h) |climb rate ms= |climb rate ftmin= |sink rate ms=0.63 |sink rate ftmin=123 |armament1= |armament2= |armament3= |armament4= |armament5= |armament6= }} See also{{aircontent|see also= |related= |similar aircraft= |lists=
}} References1. ^1 2 3 4 {{cite web|url = http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=308|title = SGS 1-29 Schweizer|accessdate = 2008-05-27|last = Activate Media|authorlink = |year = 2006|deadurl = yes|archiveurl = https://web.archive.org/web/20070808195108/http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=308|archivedate = 2007-08-08|df = }} 2. ^1 2 3 4 5 6 7 8 9 10 11 Schweizer, Paul A: Wings Like Eagles, The Story of Soaring in the United States, pages 159-209. Smithsonian Institution Press, 1988. {{ISBN|0-87474-828-3}} 3. ^1 2 3 4 5 6 7 8 Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 32. Soaring Society of America, November 1983. USPS 499-920 4. ^1 2 3 {{cite web|url = http://siris-thesauri.si.edu/ipac20/ipac.jsp?session=L21C5106397I7.28&profile=planes&uri=link=3100020~!50526~!3100001~!3100002&aspect=subtab13&menu=search&ri=4&source=~!sithesauri&term=Schweizer+7+28&index=|title = Directory of Airplanes|accessdate = 2008-05-13|last = Smithsonian Institution|authorlink = |year = 2004}} 5. ^{{cite web|url = http://registry.faa.gov/aircraftinquiry/NNumSQL.asp?verified=1&NNumbertxt=3898A|title = FAA Registry|accessdate = 2008-05-27|last = Federal Aviation Administration|authorlink = |date=May 2008}} 6. ^{{cite web|url = http://www.soaringmuseum.org/collection.html|title = Sailplanes in Our Collection|accessdate = 2008-04-15|last = Munson|first = J.|authorlink = |year = n.d.|deadurl = yes|archiveurl = https://web.archive.org/web/20110516142717/http://www.soaringmuseum.org/collection.html|archivedate = 2011-05-16|df = }} External links{{commons category|Schweizer SGS 1-29}}
5 : United States experimental aircraft 1950–1959|United States sailplanes 1950–1959|Schweizer aircraft|Mid-wing aircraft|Aircraft first flown in 1958 |
|||||||||||||||
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。