Spitfire IA & IB
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Original production model with 1,030hp Merlin II, eight browning
0.303 in. machine guns (initially only four fitted because of short
supply) or Mk IB two 20mm and four .303 machine guns.
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Spitfire II
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Castle Bromwich aircraft with small minor changes and 1,175hp Merlin
XII engine.
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Spitfire III
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Experimental prototype (one only) with 1,280hp Merlin XX engine.
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Spitfire IV
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Griffon prototype - same mark number used for 229 PR versions of
Mark V.
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Spitfire V
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Strengthened fuselage for 1,440hp Merlin 45 or 1,470 Merlin 50, drop
tank and bomb provisions. F or LF span with A, B or C armament.
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Spitfire VI
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High altitude interceptor with 1,415hp Merlin 47, pressurised
cockpit and HF 40ft 2in pointed wings.
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Spitfire VII
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High altitude interceptor with two stage Merlin 61, 64 or 71 engine,
pressurised cockpit, retractable tailwheel, often with broad pointed
rudder.
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Spitfire VIII
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Two stage Merlin 61, 63, 66 or 70 engine, unpressurised, LF, F or HF
wings.
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Spitfire IX
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Temporary stop gap marriage of uprated two stage engine, Merlin 61,
63, 66 or 70 with the Mk V airframe. LF F or HF wings, B, C or E
armament.
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Spitfire X
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Pressurised version of PR-XI with Merlin 77 - one example with HF
wing.
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Spitfire XI
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Unarmed reconnaissance aircraft with Merlin 61, 63 or 70.
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Spitfire XII
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Low level interceptor with single stage Griffon II or IV rated at
1,735hp, LF wing and B guns.
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Spitfire XIII
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Low level PR aircraft based on Mk V but with Merlin 32 (three blade
propeller of DH type - unlike other late Spitfires) Four .303 in guns.
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Spitfire XIV
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Two stage Griffon 65 or 66, 2,050hp with five blade propeller and
redesigned and strengthened airframe with symmetric deep radiators,
broad tail and often teardrop canopy, F or LF span with C or E armament.
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Spitfire XVI
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Basic Mk IX with Packard Merlin 266, F or LF span usually fitted
with C or E armament and many fitted with teardrop canopy.
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Spitfire XVIII
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Definitive fighter with two stage Griffon, F span, E guns, teardrop
canopy and extra wing fuel. FR XVIII with rear fuselage reconnaissance
camera (post war FR18)
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Spitfire XIX
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Unarmed PR version, two stage Griffon and mostly pressurised.
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Spitfire XX
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Single prototype rebuilt from MkIV and prototype MKVII
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Spitfire 21
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Redesigned airframe, mainly Griffon 61 or 64 with five blade
propeller, 4 20mm guns.
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Spitfire 22
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Minor changes some with 2,375hp Griffon 85 and contra-propeller.
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Spitfire 24
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Minor changes, Spiteful tail and short barrel MkV cannon.
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Seafire IB
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Navalised Spitfire Vb
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Seafire IIC
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Catapult hooks and strengthened landing gear, Merlin 32 and four
blade propeller.
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Seafire III
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Double folding wing, Merlin 55M 1,585hp.
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Seafire XV
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Single stage 1,850hp Griffon VI and asymmetric radiators as Spitfire
XII, most with sting hooks and later versions with production teardrop
canopy.
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Seafire XVII
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As Seafire XV with teardrop canopy, often strengthened landing gear,
some (FR17) with camera in place of rear tank.
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Seafire 45
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Same airframe as Spitfire 21, non folding wings, Griffon 61 (Five
blade) or Griffon 85 (contraprop)
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Seafire 46
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As Seafire 45 with teardrop canopy, FR46 with rear fuselage camera
and late production Spiteful tail.
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Seafire 47
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Folding wing, mostly hydraulic, 2,375hp Griffon 87 or 88 with
contraprop and carburettor air inlet just below spinner, increased fuel
capacity, all late production FR type with camera.
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