|National origin||United States|
|Manufacturer||American Microflight/Sadler Aircraft Company|
|Designer||William G. Sadler|
|First flight||mid 1982|
The Sadler SV-1 Vampire is a single-seat ultralight sport aircraft developed in the United States in the early 1980s. It is uncharacteristic of ultralight designs in both its layout and its construction. The Vampire is a mid-wing cantilever monoplane of pod-and-boom configuration and twin booms joined by a common horizontal stabilizer. The wings fold for storage and transport, and the undercarriage is of fixed tricycle type. The single engine and pusher propeller are mounted at the rear of the pod that also includes the open cockpit. Construction throughout is of metal.
The Vampire won the "Grand Champion Design" Award at the EAA Fly-in at Oshkosh, Wisconsin in August 1982. Subsequently, designer William Sadler founded American Microflight (later Sadler Aircraft Company) to produce the aircraft. Series production began in February 1983, and had reached the rate of four per month by 1984. Rights to this sport version were sold to Aero.V Australia based at Illawarra Regional Airport in Albion Park Rail, New South Wales.
By the late 1980s, Sadler was offering a militarized version of the design as the Piranha. Equipped with an enclosed cockpit, bullet-resistant fuselage pod made of Kevlar, machine gun mounts in the wing roots, and a hardpoint under each wing for disposable stores, the Piranha is intended to provide ground attack, counter-insurgency, and interdiction missions. Power was originally provided by a converted Volkswagen air-cooled engine, but a converted Chevrolet V-8 automotive engine was eventually fitted. A UAV version was developed around the same time. Designated the UAV-18-50, it carried a pilot for takeoffs and landings. It never flew without a pilot on board and was never fitted with any armament.
In May 2010 it was announced that the company and its one prototype aircraft, some spares and one Jabiru 3300 engine were all for sale for US$50,000. Company vice president David Littlejohn placed the blame for the sale of the company on the economic downturn. "We failed to meet the required pipeline commitments needed to receive second-stage capital from our investors" he explained.
- Prototype 1
- The original prototype. 30' wing, 20 hp Solo single-cylinder 2-stroke engine.
- Production version with a 30' wing. American FAR Part 103 legal. Not currently in production.
- 22' wing. Produced in Australia under license by Skywise Ultraflight with a KFM 107 engine. No longer produced.
- 22' wing. Produced in Australia under license by Skywise Ultraflight with a Rotax 447 engine. No longer produced.
- Very similar to the SV-2. Current production rights held by Aero V. Australia.
- Similar to the SV-2A with an HKS-700E 4-stroke engine. Current Production rights held by Aero V. Australia.
- UAV18-50/Experimental #001
- Also known as the RPV18-50 and the OPV18-50. Similar to the SV-2 with shorter wings and thicker wing skins. Originally powered by a Rotax 503 engine. Produced for General Atomics for evaluation in the Predator program. Only 1 built.
- Shares few components with the SV series. Powered by a V-6 auto conversion. Export version for Turkey; Unknown number built.
- Based on the A-22. Powered by a V-8 engine, capable of speeds up to 285 mph. Only 1 built.
- Vampire 2
- 2-seat US-LSA compliant version. Original prototype destroyed in post-crash fire, Sept 2008. Introduced at AirVenture 2009. The two-seat LSA verion draws heavily upon the Piranha design, including the landing gear, airframe and the folding wing system. The LSA version is powered by the 120 hp (89 kW) Jabiru 3300 four-stroke powerplant. As of August 2012, the design does not appear on the Federal Aviation Administration's list of approved special light-sport aircraft. Both the original ultralight and the 2-seat LSA version are known as the "Sadler Vampire."
 Specifications (Vampire Ultralight)
Data from Jane's All the World's Aircraft 1985–87, p.677
- Crew: One pilot
- Length: 17 ft 6 in (5.33 m)
- Wingspan: 28 ft 0 in (8.53 m)
- Height: 4 ft 8 in (1.42 m)
- Wing area: 116 ft2 (10.8 m2)
- Empty weight: 250 lb (114 kg)
- Gross weight: 550 lb (250 kg)
- Powerplant: 1 × KFM 107ER, 20 hp (15 kW)
- Maximum speed: 63 mph (101 km/h)
- Range: 300 miles (480 km)
- Service ceiling: 10,500 ft (3,200 m)
- Rate of climb: 350 ft/min (1.8 m/s)
- Jane's All the World's Aircraft 1985–86, p.677
- Sadler Aircraft History[dead link]
- Taylor 1989, p.942
- Jane's All the World's Aircraft 1987–88, p.677
- Harvey 1999, p.3
- Pew, Glenn (May 2010). "LSA Company For Sale, Sadler Vampire". Retrieved 14 May 2010.
- "SV-2A | Aero. V. Australia Pty. Ltd". Aerov.com.au. Retrieved 2012-09-02.
- "Mk.4 | Aero. V. Australia Pty. Ltd". Aerov.com.au. Retrieved 2012-09-02.
- Bayerl, Robby; Martin Berkemeier; et al: World Directory of Leisure Aviation 2011-12, page 74. WDLA UK, Lancaster UK, 2011. ISSN 1368-485X
- Federal Aviation Administration (21 June 2012). "SLSA Make/Model Directory". Retrieved 27 August 2012.
- Harvey, Patrick L. (1999). "Sadler Aircraft Corporation Presents the Sadler Piranha". Scottsdale, Arizona: Sadler Aircraft Corporation.
- Jane's All the World's Aircraft 1985–86. London: Jane's Publishing.
- Jane's All the World's Aircraft 1987–88. London: Jane's Publishing.
- "Sadler develops RPV". Flight International: 14. 4 June 1988. Retrieved 2008-12-30.
- Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.
- Sadler Aircraft Corporation website
- Sadler Vampire LSA website[dead link]
- Aero V. Australia website
- Sadler Vampire website[dead link]