Hawker

Osprey

The Osprey is a folding-wing navalised version of Hart to Air Ministry Specification O.22/26.

The Hart prototype (J9052) was used for development of the Osprey (from 1927). Development of the Osprey also included adaptations for catapult launching and for seaplane operations.

The float undercarriage was designed to be interchangeable with the normal wheeled undercarriage, using the same four attachment points thus allowing for both carrier-borne and conventional operation.

The Hawker Osprey development prototype J9052 with wings folded.

The modifications to the prototype, known as the Naval Hart against Specification O.22/26, resulted in the drafting of a new Specification 19/30 against which the production Osprey aircraft were procured.

Two production prototypes were ordered (S1667 and S1678) flying during 1931 and being tested in both landplane and seaplane form.

An initial production contract for 20 Osprey followed with Type I floats, using the Kestrel II MS engine (S1679 to S1698). The next batch of 17 aircraft (K2774 to K2790) were fitted with a larger fin and rudder.

Hawker Osprey I floatplane K2775 being hoisted aboard ship.

The Osprey entered service with the Fleet Air Arm in 1936 and continued into World War II where it was utilised as a Trainer for FAA Pilots. 

A production contract was for 14 aircraft were built as Osprey II with Type II floats although these were later modified to Osprey III standard. One Hart aircraft (K3594) was also converted to Osprey configuration.

Three trials aircraft (Osprey III stainless steel construction) were ordered for trials with serial S1699 to S1701. The first was tested on twin floats, whereas the last two were fitted with a single central float and wing-tip stabilising floats.

These were followed by production quantities of the Osprey III to Specification 10/33 with a Fairey Reed metal airscrew, dinghy (stowed in the starboard upper wing) and other modifications. Contracts were placed for 3 (further trials aircraft), 39 and 7 aircraft, for a total of 52 Osprey III.

By 1936 Ospreys had been deployed to 701 Squadron at RAF Kalafrana, acting in an anti-submarine and anti-piracy role. Over its life the Osprey saw sevice with Portugese, Spanish, Swedish and UK miltary forces.

The final version for the Royal Navy was the Osprey IV, fitted with a Kestrel V engine. A total of 26 were ordered to Specification 26/35. These aircraft (K5742 to K5767) were later used as trainers and for target towing.

Hawker Osprey I S1681 was operated from HMS Eagle.

In summary, UK production comprised: Naval Hart (J9052) two Osprey I prototypes, 37 Osprey I production, 14 Osprey II, 52 Osprey III and 26 Osprey IV. Naval Hart plus 131 Osprey.

Export aircraft comprised: Four aircraft to Sweden (2401-2404) powered by a Swedish-built Bristol Pegasus engine. The first flight (2401) took place on 8th September 1934.  Two Osprey II were supplied to Portugal (71 & 72). The first was in landplane configuration with the second as a seaplane. These aircraft were powered by the Kestrel II MS engine.

A single Osprey was supplied to Spain: This aircraft (EA-KAJ / ex-G-AEBD).  This was in fact a company demonstrator fitted with a Kestrel V engine that was later changed to Hispano-Suiza 12X brs engine prior to delivery to Spain.

Hawker production: 131 RN plus 7 export (138) plus at least two aircraft built locally in Sweden. Sweden are reported as using a total of six Osprey aircraft with serials 2401 to 2406, the first four of these having been built in the UK.

By the outbreak of the Second World War, the Osprey had largely been withdrawn from service. Those remaining continued in limited use as trainers and target tugs until early 1943.