Fokker  aircraft

The Fokker S.14 Machtrainer is a Dutch two-seater military training jet aircraft designed and manufactured by Fokker for the Royal Netherlands Air Force.

Fokker S.14 Machtrainer

Design and development

In the late 1940s, the Dutch aircraft manufacturer, Fokker, realising that the increasing use of jet-powered fighters meant that existing piston-engined advanced trainers had insufficient performance, started design of a jet-engined advanced trainer, the S.14 Machtrainer. According to Harker[2] the idea for a Dutch jet trainer originated after Rolls-Royce approached Fokker with drawings for a Derwent-powered jet trainer. Rolls-Royce feared losing the large market for jet trainers to the Goblin-powered Vampire and, after an unsuccessful attempt to interest Miles Aircraft in producing a Derwent-powered competitor, approached Fokker. The S.14 was a low-winged monoplane of all-metal construction. In order to aid use in its role as a trainer, the crew of two sat side by side on Martin-Baker ejection seats, with room in the spacious cockpit for a third crew member, although this capability was never used.This gave a fairly wide fuselage. It had a retractable tricycle undercarriage, and was powered by a single Rolls-Royce Derwent engine mounted in the centre fuselage, fed from air inlets in the aircraft's nose. Three airbrakes were fitted to the rear fuselage. The wing design and size allowed for the aircraft to land at much lower speeds than most jet aircraft at the time.

 

The first prototype, powered by a Derwent V engine, and registered PH-NDY, made its maiden flight on 19 May 1951, and despite being damaged when its undercarriage failed to extend on its second flight later the same day, was displayed at the Paris Air Show later that year.

 

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The Royal Netherlands Air Force placed an order for 20 S.14s, with the more powerful Rolls-Royce Derwent 8 engine.] Fokker had great hopes for exporting the Machtrainer, with Brazil planning to build 50 Rolls-Royce Nene powered Machtrainers under licence. The first prototype was refitted with a 5,100 lb (22.7 kN) Nene III engine, flying on 25 October 1953,this increasing the Machtrainer's maximum speed to 831 km.h (516 mph).[10] In addition, the American aircraft manufacturer Fairchild, which later also built the Fokker Friendship under license, hoped to win an order for the aircraft from the United States Air Force.

Fokker
Fokker S-14 Mach Trainer

Of the original production, two were lost in accidents and most of the rest were scrapped in the years that followed. Three still exist today including the original prototype (K-1, PH-XIV), which was operated by the Nationaal Lucht en Ruimvaart Laboratorium (NLL), located at Amsterdam's Schiphol Airport, until retirement in March 1966.[13] It was then displayed at the Aviodome museum at Schiphol before moving to the museum at Lelystad Airport by 2008.

  • History

    Role Jet trainer

    National origin Netherlands

    Manufacturer Fokker

    First flight 19 May 1951

    Introduction 1955

    Retired 1967

    Primary user Royal Netherlands Air Force

    Number built 21

  • General Info

    Crew: Two

    Length: 13.30 m (43 ft 7 ½ in)

    Wingspan: 12.0 m (39 ft 4½ in)

    Height: 4.7 m (15 ft 5 in)

    Wing area: 31.80 m²[6] (342.3 ft²)

    Empty weight: 3,765 kg[6] (8,300 lb)

    Loaded weight: 5,350 kg (11,794 lb)

    Powerplant: 1 × Rolls Royce Derwent 8 turbojet, 15.35 kN (3,452 lb)

  • Performance

    Maximum speed: 730 km/h (395 knots, 454 mph)

    Cruise speed: 589 km/h (318 knots, 366 mph[10])

    Stall speed: 142 km/h (77 knots, 88 mph[10])

    Range: 950 km (513 nmi, 590 mi)

    Service ceiling: 11,500 m (36,730 ft)

    Rate of climb: 16.3 m/s (3,200 ft/min[10])

     

Fokker S.14 Machtrainer

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The Fokker S.14 Machtrainer is a Dutch two-seater military training jet aircraft designed and manufactured by Fokker for the Royal Netherlands Air Force.

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