The Fokker D.IX was a Dutch single seat, single engine fighter aircraft, the final, more powerful evolution of the Fokker D.VIIWorld War I success, flown in 1921. The sole example was purchased by the US Army Air Service but not developed further.
The D.IX was the final development of the D.VII, an outstanding World War I fighter. It had a 300 hp (224 kW) Hispano-Suiza 8Fb (Type 42)[1] water-cooled V-8, much more powerful than the D.VII's original 160 hp (120 kW) Mercedes D III engine and even most other engines experimentally fitted to this airframe. Engine installation apart, the D.VII and D.IX were externally similar apart from their empennages.[2]
The D.IX was a single bay biplane, its wings constructed in Fokker's established fashion with two box spars and fabric covering. The interplane struts were N-form while the cabane structure included two fully triangulated forward struts connecting to the forward spar, and a pair of single struts connecting to the rear spar. Ailerons were only fitted on the upper planes.[2]
Its welded steel tube fuselage was flat sided, with the single seat open cockpit behind the trailing edge of the upper wing. The straight edged fin and rudder appeared small though the latter extended down to the keel. The strut braced tailplane was placed on top of the fuselage. The D.IX's fixed conventional undercarriage was of the single axle type, with the mainwheels on V-struts. This was much like that of the D.VII but the airfoil shaped axle fairing was enlarged to contain a fuel tank, an arrangement first trialed in the Fokker V.36. An extra strut from the rear of the tank to the central fuselage underside helped to support it.[2]
The D.IX was sold to the US Army Air Service (USAAS) in 1922 and shipped to their experimental centre at McCook Field where they had earlier tried a variety of different engines in D.VIIs.[2][3] They designated it the PW-6. Instead of the original engine a locally built licensed version of the Hispano Type 42, the 320 hp (238 kW) Wright M-2 was fitted.[1][3] They also fitted armament, two fixed 7.7 mm (0.303 in) machine guns in the upper engine cowling, firing through the propeller.[3] Though it had a maximum speed about 20% greater than that of the standard D.VII and climbed twice as fast, the USAAS concluded it was not worth further development.[2]
Variantsedit
D.IX
Fokker factory designation
PW-6
US Army Air Service (USAAS) designation indicating that it was the sixth water-cooled pursuit (fighter) tested.
Maximum speed: 223 km/h (139 mph, 120 kn) at sea level
Cruise speed: 188 km/h (117 mph, 102 kn)
Range: 471 km (293 mi, 254 nmi)
Time to altitude: 6.3 min to 1.980 m (6,500)
Referencesedit
Wikimedia Commons has media related to Fokker D.IX.
^ abLage, Manual (2004). Hispano Suiza in Aeronautics. Warrendale, USA: SAE International. pp. 66–7, 482. ISBN0-7680-0997-9.
^ abcdefgGreen, William; Swanborough, Gordon (1994). The Complete Book of Fighters. Godalming, UK: Salamander Books. pp. 225, 228. ISBN1-85833-777-1.
^ abcWesselink, Theo; Postma, Thijs (1982). De Nederlandse vliegtuigen. Haarlem: Romem. p. 25. ISBN90 228 3792 0.
December 15, 2023
fokker, dutch, single, seat, single, engine, fighter, aircraft, final, more, powerful, evolution, fokker, world, success, flown, 1921, sole, example, purchased, army, service, developed, further, role, singe, seat, fighter, aircraftnational, origin, netherland. The Fokker D IX was a Dutch single seat single engine fighter aircraft the final more powerful evolution of the Fokker D VII World War I success flown in 1921 The sole example was purchased by the US Army Air Service but not developed further Fokker D IXRole Singe seat fighter aircraftNational origin NetherlandsManufacturer Fokker FlugzeugwerkeFirst flight 1921Number built 1Developed from Fokker D VII Contents 1 Design and development 2 Operational history 3 Variants 4 Specifications 5 ReferencesDesign and development editThe D IX was the final development of the D VII an outstanding World War I fighter It had a 300 hp 224 kW Hispano Suiza 8Fb Type 42 1 water cooled V 8 much more powerful than the D VII s original 160 hp 120 kW Mercedes D III engine and even most other engines experimentally fitted to this airframe Engine installation apart the D VII and D IX were externally similar apart from their empennages 2 The D IX was a single bay biplane its wings constructed in Fokker s established fashion with two box spars and fabric covering The interplane struts were N form while the cabane structure included two fully triangulated forward struts connecting to the forward spar and a pair of single struts connecting to the rear spar Ailerons were only fitted on the upper planes 2 Its welded steel tube fuselage was flat sided with the single seat open cockpit behind the trailing edge of the upper wing The straight edged fin and rudder appeared small though the latter extended down to the keel The strut braced tailplane was placed on top of the fuselage The D IX s fixed conventional undercarriage was of the single axle type with the mainwheels on V struts This was much like that of the D VII but the airfoil shaped axle fairing was enlarged to contain a fuel tank an arrangement first trialed in the Fokker V 36 An extra strut from the rear of the tank to the central fuselage underside helped to support it 2 The D IX prototype first flew in 1921 2 Operational history edit nbsp Fokker PW 6The D IX was sold to the US Army Air Service USAAS in 1922 and shipped to their experimental centre at McCook Field where they had earlier tried a variety of different engines in D VIIs 2 3 They designated it the PW 6 Instead of the original engine a locally built licensed version of the Hispano Type 42 the 320 hp 238 kW Wright M 2 was fitted 1 3 They also fitted armament two fixed 7 7 mm 0 303 in machine guns in the upper engine cowling firing through the propeller 3 Though it had a maximum speed about 20 greater than that of the standard D VII and climbed twice as fast the USAAS concluded it was not worth further development 2 Variants editD IX Fokker factory designation PW 6 US Army Air Service USAAS designation indicating that it was the sixth water cooled pursuit fighter tested Specifications editData from Green and Swanborough 1994 2 General characteristicsCrew One Length 8 99 m 29 ft 6 in Wingspan 7 09 m 23 ft 3 in Height 2 74 m 9 ft 0 in Wing area 22 11 m2 238 0 sq ft Empty weight 874 kg 1 927 lb Gross weight 1 253 kg 2 762 lb Powerplant 1 Hispano Suiza 8Fb water cooled V 8 220 kW 300 hp Propellers 2 bladedPerformance Maximum speed 223 km h 139 mph 120 kn at sea level Cruise speed 188 km h 117 mph 102 kn Range 471 km 293 mi 254 nmi Time to altitude 6 3 min to 1 980 m 6 500 References edit nbsp Wikimedia Commons has media related to Fokker D IX a b Lage Manual 2004 Hispano Suiza in Aeronautics Warrendale USA SAE International pp 66 7 482 ISBN 0 7680 0997 9 a b c d e f g Green William Swanborough Gordon 1994 The Complete Book of Fighters Godalming UK Salamander Books pp 225 228 ISBN 1 85833 777 1 a b c Wesselink Theo Postma Thijs 1982 De Nederlandse vliegtuigen Haarlem Romem p 25 ISBN 90 228 3792 0 Retrieved from https en wikipedia org w index php title Fokker D IX amp oldid 1149903119, wikipedia, wiki, book, books, library,
