Engineering:Sling Aircraft Sling 2
| Sling 2 | |
|---|---|
| |
| Sling 2 | |
| Role | Light Sport Aircraft |
| Manufacturer | Sling Aircraft |
| Designer | Mike Blyth |
| First flight | 18 November 2008 |
| Introduction | 2009 |
| Number built | 310 (2019)[1] |
| Variants | Sling Aircraft Sling 4 |
The Sling Aircraft Sling 2, formerly called The Airplane Factory Sling 2, is a South African two-seater light aircraft designed and produced by Sling Aircraft in Johannesburg, South Africa.[2] In 2009 the specially modified second prototype was flown around the world in a westerly circumnavigation which took 40 days.[3] This was the first time any aircraft of this class had achieved a circumnavigation.[4] The design complies with the requirements of four different regulatory aircraft classes.[5][6]
The design was originally known as the Sling, but was re-designated as the Sling 2 to distinguish it from the later four-seat Sling 4.
The Sling 2 is supplied as a kit and as a ready-to-fly aircraft and can be operated as a light-sport aircraft or homebuilt aircraft.
Design and development
Development of the Sling 2 commenced in 2006. The Sling is a two-seat, low wing, all metal aircraft with tricycle landing gear made from composites. The aircraft is powered by an 80 hp (60 kW) Rotax 912UL,100 hp (75 kW), a Rotax 912ULS, or a 912iS engine, or optionally a turbocharged 115 hp (86 kW) Rotax 914 UL, driving a 3-bladed Warp Drive Inc propeller. The factory later discontinued the 80 hp (60 kW) Rotax 912UL model. The airplane features a sliding canopy, large fuel tanks, and standard equipment includes a "glass cockpit" style display.[7][2][8][9][10]
Mike Blyth began working on the design of the Sling 2 in 2006; the first prototype first flew on November 18, 2008. A full testing programme followed, with the help of a South African military aerodynamicist, which was completed in 2009. Blyth and partner James Pitman then flew the second prototype around the world to accomplish a challenging circumnavigation.[4][11]
310 Sling 2s had been completed and flown by the end of 2019.[1]
The UK Light Aircraft Association has limited the airframe structural fatigue life to 500 hours for aircraft in that country. They have also only approved operation for day, visual flight rules.[12]
Operational history
The second prototype Sling 2 was flown on a westerly global circumnavigation in 2009. Blyth and Pitman departed from South Africa flying up through Western Africa, across the Atlantic to Brazil and Guyana, up through the US Virgin Islands and the East Coast of the United States to Oshkosh, Wisconsin for EAA AirVenture Oshkosh 2009. After the air show they flew across the United States to Los Angeles, then on to Hawaii, the Marshall Islands, Micronesia, Indonesia, Malaysia, Sri Lanka, Seychelles, and finally back to South Africa. They completed the whole journey in 40 days.[3] The aircraft used for the circumnavigation was a standard production Sling, but with larger 118.8 U.S. gallons (450 L; 98.9 imp gal) fuel tanks, strengthened landing gear, seats that lie flat for sleeping and removable control sticks.[13][14] After being modified, the aircraft had an endurance at standard cruise of approximately 24 hours. The aircraft cruised at 89 knots Indicated airspeed (IAS) (98 knots True airspeed (TAS)) with almost full fuel. When more nearly empty, it would cruise at 96 knots IAS (105 knots TAS). With full fuel, fully loaded with crew the Sling weighed approximately 1,984 Lbs (900 kg), or about 600 pounds overweight. At sea level the aircraft would climb slowly, at a rate of 350 feet per minute.[7][4][14]
Variants
- Sling 2
- Base model with 100 hp (75 kW) Rotax 912 engine, certified either as an E-LSA (limited to a max gross weight of 1,320 lbs) or experimental-amateur built aircraft.[15]
- Sonaca 200
- The Sonaca 200 is an EASA-certified variant of the Sling 2, developed in Belgium fitting the 115 hp (86 kW) Rotax 914F engine, introduced in 2017.[16][17]
Specifications (2012 model Sling 2)
Data from The Airplane Factory[18]
General characteristics
- Crew: one
- Capacity: one passenger
- Length: 22.89 ft (6.98 m)
- Wingspan: 30.09 ft (9.17 m)
- Height: 8.202 ft (2.500 m)
- Wing area: 127.5 sq ft (11.85 m2)
- Aspect ratio: 7.04:1
- Empty weight: 816 lb (370 kg)
- Gross weight: 1,543 lb (700 kg) [10]
- Fuel capacity: Two tanks with 19.3 U.S. gallons (73 L; 16.1 imp gal) usable
- Powerplant: 1 × Rotax 912iS , 100 hp (75 kW)
- Propellers: 3-bladed Warp Drive Inc composite
Performance
- Cruise speed: 120 kn (140 mph, 220 km/h) true airspeed[10]
- Stall speed: 40 kn (46 mph, 74 km/h) full flaps, indicated airspeed
- Never exceed speed: 135 kn (155 mph, 250 km/h) indicated airspeed
- Service ceiling: 13,000 ft (4,000 m)
- g limits: +4/-2 g
- Wing loading: 12.10 lb/sq ft (59.1 kg/m2)
See also
Aircraft of comparable role, configuration and era
References
- ↑ 1.0 1.1 Bodenstein, Willie. "Pilot's Post - Celebrating Success-The Airplane Factory Breakfast Fly-in 2019". http://www.pilotspost.com/arn0001929.
- ↑ 2.0 2.1 African Pilot, Athol Franz, The Aircraft Factory Sling, Dec 2010, Volume 9, Number 12, pp. 70–71.
- ↑ 3.0 3.1 "Around the World in 40 LSA Days". Plane & Pilot Magazine. http://light-sport-hangar-flyin.blogspot.com/2010/01/around-world-in-40-lsa-days.html.
- ↑ 4.0 4.1 4.2 SA Flyer, Guy Leitch, Sling around the world, Oct 2009, No. 168, pp. 20–28.
- ↑ "Out of Steam? No Way! Welcome to Sling". http://www.bydanjohnson.com/showsplog.cfm?id=1621.
- ↑ "LSA Registration Categories...What's the Difference?". http://www.aviatorshotline.com/content/lsa-registration-categorieswhat%E2%80%99s-difference.
- ↑ 7.0 7.1 Bernard, Mary and Suzanne B. Bopp: The Airplane Factory: Sling 2 (and Sling 4), Kitplanes, Volume 29, Number 12, December 2012, page 22. Belvoir Publications. ISSN 0891-1851
- ↑ "Sling Receives First S-LSA Certification". http://www.eaa.org/news/2012/2012-05-22_sling.asp.
- ↑ Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015–16, page 83. Flying Pages Europe SARL, 2015. ISSN 1368-485X
- ↑ 10.0 10.1 10.2 Sling Aircraft. "Sling 2". www.slingaircraft.com. https://www.slingaircraft.com/aircraft/sling-2/.
- ↑ "Sling Design & Construction". http://www.airplanefactory.com/aircraft/design-construction/.
- ↑ Light Aircraft Association (19 May 2022). "LAA Type Acceptance Data Sheet - TADS 399 - Sling 2". lightaircraftassociation.co.uk. http://www.lightaircraftassociation.co.uk/engineering/TADs/399%20SLING%202.pdf.
- ↑ "Spirit of Adventure". http://www.airventure.org/news/2009/090729_sling.html.
- ↑ 14.0 14.1 "Around the World Sling Modifications". http://airplanefactory.co.za/world/aircraft.asp.
- ↑ "Sling 2 KIT". https://www.airplanefactory.com/aircraft/sling-2-kit/. Retrieved 10 January 2021.
- ↑ "Sonaca Aircraft Website". http://www.sonaca-aircraft.com. Retrieved 10 January 2021.
- ↑ "Sonaca 200: Price, Cockpit, Specs, and Performance". https://aircraftupdates.com/sonaca-200/. Retrieved 10 January 2021.
- ↑ "Sling Specifications". http://www.airplanefactory.com/aircraft/specifications/.
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