Sage Type 4

The Sage Type 4 was a prototype British floatplane of the First World War. It was a designed as a two-seat reconnaissance aircraft for the Royal Naval Air Service, but was chosen for service as a floatplane trainer, although the end of the war resulted in production being cancelled.

Design and development In early 1917, the Peterborough based woodworking company of Frederick Sage & Company designed a two-seat patrol floatplane for the Royal Naval Air Service based on Sage's Type 3 landplane trainer. Like the Type 3, the new design, the Sage Type 4, was a single-engined biplane. Pilot and observer sat in separate tandem cockpits, with the pilot occupying the front cockpit, while the wireless operator/observer sat in the rear cockpit, with both crew members having good visibility. The aircraft was powered by a single 150 hp (112 kW) Hispano-Suiza 8 water-cooled V-8 engine in the nose driving a tractor propeller. Undercarriage consisted of two main floats under the wing the a further tail float.Uppendaun 2004, p. 69.Flight 24 July 1919, pp. 974–975.

The prototype Sage Type 4a (serial number N.116Bruce 1957, p. 468.) first flew on 3 July 1917.Bruce 1957, p. 465. The type demonstrated excellent handing during testing, being capable both of flying aerobatic manoeuvres while still being stable enough to be easily flown "hands-off".Flight 24 July 1919, p. 975. Despite this, the type was rejected for service as a patrol aircraft, but it was recommended that it instead be adapted into a float-plane trainer. The aircraft was fitted with dual controls and the engine mounting was modified to allow any one of a variety of 200 hp (149 kW) engines to be fitted. N.116 was converted to the new standard, being fitted with a Sunbeam Arab and flew as the Sage Type 4b on 17 May 1918.

Sage also designed a revised version, the Sage Type 4c with folding wings of increased wingspan (39 ft in (12.07 m) compared with 34 ft 6 in (10.52 m) for the earlier aircraft and powered by a 200 hp Hispano Suiza engine, with a prototype flying on 12 October 1918.Bruce 1957, p. 466.

Both the Type 4b and 4c were adopted as standard training floatplanes for the RNAS, but the end of the First World War resulted in production plans being abandoned.

Variants Type 4a Two-seat patrol seaplane, powered by Hispano-Suiza 8A engine. One prototype built. Converted to Type 4b.Bruce 1957, p. 464. Type 4b Two seat floatplane trainer, powered by Sunbeam Arab engine. Converted from Type 4a.Bruce 1957, p. 465. Type 4c Revised floatplane trainer with folding wings. Powered by Hispano-Suiza 8B engine. One example built.Bruce 1957, p. 466.

Specifications (Sage 4c)

Sage Type 4

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