| name = JS-1 Revelation | image = File:JS1_FullRes-3.jpg | caption = | alt =
}}{{Infobox aircraft type | type = High performance Sailplane | national origin = South Africa | manufacturer = Jonker Sailplanes | designer = | first flight = 12 December 2006 | introduced = | retired = | status = | primary user = | more users = | produced = | number built = 100[1] (as of 2015) | program cost = | unit cost = | developed from = | variants with their own articles = | developed into = }}|} The Jonker JS-1 Revelation is a glider built of glass-fibre, carbon fibre and Kevlar. It is available with an 18-metre span for the 18 metre class or a 21-metre span for the Open class. The manufacturer is Jonker Sailplanes of Potchefstroom South Africa, founded in 2004 by two brothers, Attie and Uys Jonker. The structural and chief designer is Attie Jonker, while the airfoil and main aerodynamic features were developed by Johan Bosman in co-operation with the Delft University of Technology. 18 metre versionsThe wing has full-span flaperons, an elliptical planform and uses winglets. It is in 4 pieces, each tip is 1.5 metres. Two novel features are: - a double-hole blowing/suction system in the wings to minimise drag. The two rows of blow holes on the lower surface prevent turbulent flow at specific locations for different flap settings, thus reducing drag
- a jet engine for the self-sustaining version. A self-launching version was considered but it was decided that the fuselage would require extensive structural modification.
The first flight of the JS-1 was on 12 December 2006. Series production then started and up to July 2012 about 34 had been produced[2] Although it has been built to EASA standards, discussions on EASA certification are still continuing (as at July 2012). Attie Jonker won the 18 metre class South African National Championship in 2008 with a JS-1 Revelation. 21 metre versionA new version, JS1C-21m, with 3 metre wing-tips, which increase the span to 21 metres, has been developed. The first flight was on 22 March 2012. Because of the higher wing loads and increased maximum take-off mass of 720 kg (increased from 600 kg), the wing/wingtip junction has been redesigned including stronger wing spar caps and thicker wing-tip spars. All future JS1 Revelations will be compatible with the optional 21m wing-tips. The new wing-tips have water tanks each with a capacity of 17 litres of ballast which can be jettisoned separately from the main wing and fin tanks. Theoretical performance gives a claimed best glide of around 1:60, and with the maximum wing loading of 58.7 kg/m2 and the polar remaining flat at high cruise speeds. The manufacturers state that it is competitive at the highest level with other Open Class gliders. The results (2nd, 3rd and three other places in the top ten in the 2014 World Gliding Championships Open Class[3]) supports this assertion.[4] EASA certificationThe JS1-C is certificated in Europe by M&D Flugzeugbau as the JS-MD Single, with a retractable MD-TJ42 turbojet engine mounted behind the cockpit. [5]Variants- JS-1
18 meter wingspan prototypes - JS-1B
18 meter wingspan 18 metre class competition glider, production version. - JS-1C
21 meter wingspan Open class competition glider Specifications (JS-1B){{Aircraft specs | ref= | prime units?=met | genhide= | crew=One | capacity= | length m=7.17 | length ft= | length in= | length note= | span m=18 | span ft= | span in= | span note= | upper span m= | upper span ft= | upper span in= | upper span note= | mid span m= | mid span ft= | mid span in= | mid span note= | lower span m= | lower span ft= | lower span in= | lower span note= | swept m= | swept ft= | swept in= | swept note= | dia m= | dia ft= | dia in= | dia note= | width m= | width ft= | width in= | width note= | height m= | height ft= | height in= | height note= | wing area sqm= | wing area sqft= | wing area note= | swept area sqm= | swept area sqft= | swept area note= | volume m3= | volume ft3= | volume note= | aspect ratio=28.8 | airfoil=JS-02-127 T12 with 6 variations along wing | empty weight kg=280 | empty weight lb= | empty weight note= | gross weight kg=600 | gross weight lb= | gross weight note=
- Water ballast: {{convert|200|kg|lb|abbr=on|0}}
| max takeoff weight kg= | max takeoff weight lb= | max takeoff weight note= | fuel capacity= | lift kg= | lift lb= | lift note= | more general= | eng1 number= | eng1 name= | eng1 type= | eng1 kw= | eng1 hp= | eng1 shp= | eng1 kn= | eng1 lbf= | eng1 note= | power original= | thrust original= | eng1 kn-ab= | eng1 lbf-ab= | eng2 number= | eng2 name= | eng2 type= | eng2 kw= | eng2 hp= | eng2 shp= | eng2 kn= | eng2 lbf= | eng2 note= | eng2 kn-ab= | eng2 lbf-ab= | eng3 number= | eng3 name= | eng3 type= | eng3 kw= | eng3 hp= | eng3 shp= | eng3 kn= | eng3 lbf= | eng3 note= | eng3 kn-ab= | eng3 lbf-ab= | more power= | prop blade number= | prop name= | prop dia m= | prop dia ft= | prop dia in= | prop dia note= | rot number= | rot dia m= | rot dia ft= | rot dia in= | rot area sqm= | rot area sqft= | rot area note= | perfhide= | max speed kmh=290 | max speed mph= | max speed kts= | max speed note= | max speed mach= | cruise speed kmh= | cruise speed mph= | cruise speed kts= | cruise speed note= | stall speed kmh=75 | stall speed mph= | stall speed kts= | stall speed note= | never exceed speed kmh= | never exceed speed mph= | never exceed speed kts= | never exceed speed note=
- Max rough air speed - {{convert|198|km/h|mph|abbr=on|0}}
| minimum control speed kmh= | minimum control speed mph= | minimum control speed kts= | minimum control speed note= | range km= | range miles= | range nmi= | range note= | combat range km= | combat range miles= | combat range nmi= | combat range note= | ferry range km= | ferry range miles= | ferry range nmi= | ferry range note= | endurance= | ceiling m= | ceiling ft= | ceiling note= | g limits= | roll rate= | glide ratio= | climb rate ms= | climb rate ftmin= | climb rate note= | time to altitude= | sink rate ms=0.50 | sink rate ftmin=100 | sink rate note= | lift to drag=53 | wing loading kg/m2=31.2 | wing loading lb/sqft= | wing loading note= - 53.6 kg/m² (10.9 lb/sqft) | disk loading kg/m2= | disk loading lb/sqft= | disk loading note= | fuel consumption kg/km= | fuel consumption lb/mi= | power/mass= | thrust/weight= | more performance= | armament= | guns= | bombs= | rockets= | missiles= | hardpoints= | hardpoint capacity= | hardpoint rockets= | hardpoint missiles= | hardpoint bombs= | hardpoint other= | avionics=
}}See also{{aircontent | see also= | related= | similar aircraft=- Schempp-Hirth Quintus
- Lange Antares 23E
- Schleicher ASH 31
| lists=
}}Notes1. ^Jonker Sailplanes retrieved on 07 Jan 2016
2. ^{{cite web|title=Jonker web-site|url=http://www.jonkersailplanes.co.za/specifications.htm|accessdate=2 June 2013}}
3. ^Note that maximal take off mass of JC-1C's (720kg) was significantly lower than the class limit of 850kg, placing JC-1C's at a theoretical disadvantage
4. ^Official results of 2014 FAI World Gliding Championships in Leszno, Poland;retrieved on 13 Aug 2014
5. ^{{cite web|url=https://www.easa.europa.eu/system/files/dfu/TCDS_A616_JS-MD%20Single%20issue%201.pdf|title=Type Certificate Data Sheet EASA.A.616 JS-MD Single|publisher=European Aviation Safety Agency|date=1 June 2017}}
References{{reflist}}External links 1 : South African sailplanes 2000–2009 |
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