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The Coates Swalesong is a 1970s British two-seat homebuilt monoplane.

Swalesong
The Swalesong S.A.II at Bourn Airfield Cambridgeshire in 1982
Role	Homebuilt monoplane Type of aircraft
Designer	James Ralph Coates
First flight	1973[1]
Retired	2007
Status	Preserved
Primary user	Private pilot owner

Development and operational history

The Swalesong S.A.II was designed and built by J. R. Coates. It is a low-wing wooden construction (spruce with plywood skin) cantilever monoplane with a fixed tricycle undercarriage, with pilot and passenger sitting side-by-side in an enclosed cockpit with a sliding canopy.[2] It first flew on 2 September 1973,[2][1] powered by a 90 hp (67 kW) Continental PC60 Ground Power Unit converted to Continental C90 standard.[3] A simplified version, the Swalesong S.A.III, was designed for homebuilding, which could be powered by engines of 85–108 hp (63–81 kW).[4]

Only one S.A.II G-AYDV and one simplified S.A.III were built. The Swalesong S.A.II survives at Breighton Airfield, East Yorkshire. The CAA G-INFO website shows that its registration is current in February 2021.

Variants

Swalesong S.A.I

Designation of Luton Minor registration G-AMAW built by Jim Coates in the 1950s, not connected with S.A.II or S.A.III

Swalesong S.A.II

Prototype, one built.[4]

Swalesong S.A.III

Simplified design for amateur construction, one built.[4]

Specifications (SAII)

Data from Jane's All the World's Aircraft 1975–76[2]

General characteristics

• Length: 19 ft 0 in (5.79 m)
• Wingspan: 26 ft 5 in (8.05 m)
• Height: 7 ft 3 in (2.21 m) (overall)
• Wing area: 120 sq ft (11 m²)
• Airfoil: NACA 23013.5
• Empty weight: 730 lb (331 kg)
• Max takeoff weight: 1,207 lb (547 kg)
• Fuel capacity: 24 imp gal (29 US gal; 110 L)
• Powerplant: 1 × Continental C90 air-cooled four-cylinder horizontally opposed engine, 90 hp (67 kW)
• Propellers: wooden fixed-pitch-bladed, 5 ft 2 in (1.57 m) diameter

Performance

• Maximum speed: 130 mph (210 km/h, 110 kn) at 1,000 ft (300 m)
• Cruise speed: 95 mph (153 km/h, 83 kn) at 1,000 ft (300 m) (econ. cruise)
• Stall speed: 49 mph (79 km/h, 43 kn) (flaps down)
• Never exceed speed: 170 mph (270 km/h, 150 kn)
• Range: 450 mi (720 km, 390 nmi)

References

Wikimedia Commons has media related to Coates Swalesong.

• Jackson, A.J. (1974). British Civil Aircraft since 1919 Volume 2. London: Putnam. ISBN 0-370-10010-7.
• Ord-Hume, A. W. J. G. (2013). British Private Aircraft 1946–1970: Volume 2. Petersfield: MMP Books. ISBN 978-83-61421-92-4.
• Taylor, John W. R., ed. (1975). Jane's All the World's Aircraft 1975–75. London: Jane's Yearbooks. ISBN 0-354-00521-9.
• Taylor, John W. R., ed. (1982). Jane's All the World's Aircraft 1982–83. London: Jane's Yearbooks. ISBN 0-7106-0748-2.

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