The Supermarine Scapa was a British general reconnaissance flying boat built by Supermarine that was used by the Royal Air Force between 1935 and 1939. It was developed from the Southampton and formed the basis of the later Stranraer flying boat.
|A Royal Navy Supermarine Scapa at the Marine Aircraft Experimental Establishment, Felixstowe, Suffolk (UK), in 1933.|
|Role||Reconnaissance flying boat|
|Manufacturer||Supermarine Aviation Works (Vickers), Ltd.|
|Primary user||Royal Air Force|
|Developed from||Supermarine Southampton|
After experimenting with a three-engine design of flying boat, (the Nanok/Solent/Southampton X), Supermarine's chief designer, R.J. Mitchell, decided that the good hydrodynamic design that had been developed in the twin-engined Southampton, would be the platform for the next aircraft.
A prototype designated the Southampton IV was built. It had a hull that performed even better in the tank tests. An Air Ministry Specification was received in November 1931. The test pilot Joseph "Mutt" Summers took the first flight on 8 July 1932. The name had then been changed to the Scapa.
15 Scapas were built before production was changed to a more powerful development, the Stranraer.
The Scapa hull was an all-metal structure, while the wing and tail surfaces had metal structure with fabric covering. The two Rolls-Royce Kestrel V-12 engines were mounted in nacelles underslung from the upper wing, and there were two fins, each placed at the mid semi-span of the tailplane. Similar to the Southampton, there were three gun positions provided, one in the nose and two staggered in the rear fuselage. They were provided each one with a single .303 British (7.7 mm) caliber Lewis Mk.I machine guns.
Sourced from 
- Crew: Five
- Length: 53 ft (16.2 m)
- Wingspan: 75 ft (22.85 m)
- Height: 21 ft (6.4 m)
- Wing area: 1,300 ft2 (121 m2)
- Empty weight: 10,030 lb (4,500 kg)
- Loaded weight: 16,080 lb (7,290 kg)
- Powerplant: 2 × Rolls-Royce Kestrel IIIMS Water-cooled V12, 525 hp (392 kW) each
- Maximum speed: 123 kn (142 mph, 229 km/h)
- Range: 870 nmi (1000 mi, 1610 km)
- Service ceiling: 15,500 ft (4,720 m)
- Rate of climb: 625 ft/min (3.25 m/s)
- Wing loading: 12.3 lb/ft2 (60.2 kg/m2)
- Power/mass: 0.065 hp/lb (0.107 kW/kg)
- Climb to 9,840 ft (3000 m): 20 minutes
- Guns: 3 × 0.303 in (7.7 mm) Lewis guns, one in bow and two amidships
- Bombs: 1,000 lb (454 kg) bombload under the wings
Aircraft of comparable role, configuration and era
- Andrews & Morgan
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