Mosquito Variants

Prototype/PR.1 Prototype and first few photo-reconnaissance aircraft. Easily distinguishable by short engine nacelles.  Two Rolls-Royce Merlin 21 engines with two speed, single stage superchargers and De Havilland hydromatic propellers.
F.II Fighter. Developed from prototype W4052. Four 20mm cannon and four.303in Browning machine guns. Rolls-Royce Merlin 21 and 23 engines. Two were built experimentally with a rotating dorsal turret equipped with four .303in machine guns. Some examples converted to PR.II.
T.III Trainer. As Mark II but with dual control and without armament. Rolls-Royce Merlin 21 and 23 engines
B.IV Unarmed bomber. Like the PR.1 but with longer engine nacelles. Rolls-Royce Merlin 21 and 23 engines.  Capacity for four 500lb bombs (with shortened fins) in the fuselage in place of the four 250lb bombs in the original design. Later modified to carry a 4000lb bomb (blockbuster or "cookie") with a bulged bomb-bay. The first operational sorties were made in daylight to Cologne. The first bombing of Berlin by daylight was made by B.IV's on 30th January 1943.
PR.IV Unarmed photo-reconnaissance aircraft. Like the B.IV, but with provision for cameras instead of bombs. A variant of the PR.IV was supplied to BOAC as the prototype Mosquito courier-transport. 'Accommodation' for the two passengers was on their backs in the felt-padded bomb bay.
B.V Prototype developed from the B.IV with new 'standard wing' to take either two 50 gallon jettisonable wing tanks or two 500lb bombs. Rolls-Royce Merlin 23 engines. This aircraft was the basis of the Canadian B.VII.
FB.VI Fighter bomber. Developed from the NF.II with Rolls- Royce Merlin 22, 23 and 25 engines. Same armament as the NF.II plus two 50 gallon jettisonable wing tanks or two 500lb bombs (or extra tankage in the fuselage behind the cannon). Provision was made in 1944 to carry four 60lb rockets under each wing in place of the wing tanks or bombs for attacks on shipping. Two Mk.6 Mosquitos were modified for deck landing and converted to Sea Mosquitos by adding an arrestor hook, strengthening the rear fuselage and fitting four bladed propellers, becoming the basis for the Mk.33.
B.VII Bomber. First 25 Canadian built Mosquitos based on the B.V, but with Packard Merlin 31 engines driving Hamilton standard propellers.
PR.VIII Photo-reconnaissance aircraft. The first high altitude Mosquitos. The PR.VIII was converted from B.IV by fitting special Merlin 61 intercooled engines with two speed, two stage superchargers and adding provision for two 50 gallon jettisonable wing tanks. Only five were built.

B.IX Bomber. First high altitude unarmed bomber. Merlin 72 intercooled engines with two speed, two stage superchargers. Capacity for four 500lb bombs in the fuselage and two 500lb bombs on the wings or extra fuselage fuel tanks and 50 gallon jettisonable wing tanks. A few were converted to take one 4000lb bomb in the fuselage with two 50 gallon jettisonable wing tanks which were later in 1944 replaced by 100 gallon jettisonable wing tanks subject to a weight limitation of 25,200lb. A Pathfinder version was developed by the RAF.

PR.IX Photo-reconnaissance aircraft. Photo-reconnaissance version of the B.IX, used by the RAF and US 8th Air Force for meteorological reconnaissance over Europe before all major day and night bombing raids.
FB.X Proposed fighter bomber as FB.VI but with Merlin 67 engines. Never built.
Mk.XI Mark never used.
NF.XII Fighter. Four cannon fighter developed from the NF.II, but with the four machine guns and the A.I. Mk. 5 radar being replaced by centimetric A.I. Mk 8 radar in nose radome. Merlin 21 and 23 engines. The 'standard wing' was not fitted.
NF.XIII Fighter.Four cannon fighter developed from the FB.VI. The four machine guns in the nose replaced by A.I Mk 8 radar in 'bull' nose. Merlin 21 and 23 engines.
NF.XIV Proposed fighter as NF.XIII but with high altitude Merlin 67 engines. Never built.
NF.XV Fighter. Special high altitude fighter developed in only seven days from pressure cabin prototype PR.VIII with extended wing tips, reduced fuel tankage and four .303in machine guns in a blister under the fuselage. Only five built.
B.XVI Bomber. Pressure cabin development of the B.IX with Merlin 72, 73, 76 and 77 engines able to carry 3000lb bombs. All were converted in 1944 to take 4000lb bomb in the fuselage and two 50 gallon wing drop tanks or 100 gallon drop tanks with four 500lb bombs.
PR.XVI Photo-reconnaissance aircraft. Photo-reconnaissance version of the B.XVI. Three extra fuel tanks fitted in the bomb bay. In addition to the cameras carried in the fuselage, one F.52 camera could be carried in each drop tank.
NF.XVII Fighter. Fighter developed from and similar to the NF.XII with American A.I. Mk 10 radar.
FB.XVIII Fighter bomber. The 'Tsetse'. Developed from the FB.VI with the nose modified to take a six-pounder (57mm) anti-tank gun instead of the four 20mm cannon. The six-pounder could fire 25 shells in 20 seconds. Merlin 25 engines. Used mainly by Coastal Command against submarines and shipping.
NF.XIX Fighter. Developed from and similar to the NF.XIII, but with Merlin 25 engines and able to take either British or American radar sets. In 1948-49, 45 were overhauled and fitted with four blade airscrews and supplied to the Royal Swedish Air Force who designated the aircraft the J.30.
B.XX Bomber. Second batch of Canadian production. Similar to the B.VII but with Canadian-American equipment and Packard Merlin 31 or 33 engines. Forty fitted with cameras were supplied to the USAAF (who designated them the F.8) and were used for meteorological and operational reconnaissance.
FB.21 Fighter bomber. Canadian built fighter bomber corresponding to the FB.VI otherwise as the B.XX. Only three were built, one with Packard Merlin 33 engines, the other two with Packard Merlin 31 engines. Replaced by the FB.26.
T.22 Trainer. Canadian built unarmed dual control trainer based on the FB.21 with Packard Merlin 33 engines. Only six were built. Similar to the T.III.
B.23 Bomber. Canadian built high altitude bomber. A development of the B.XX to make use of Packard Merlin 69 engines. Not proceeded with because sufficient supplies of Packard Merlin 225 (single stage, supercharged) engines became available.
FB.24 Fighter bomber. Canadian built high altitude fighter bomber developed from the FB.21 with Packard Merlin 301 (two stage, supercharged) engines. Only one built.
B.25 Bomber. Canadian built bomber identical to the B.XX but with Packard Merlin 225 engines.
FB.26 Fighter bomber. Canadian built fighter bomber developed from the FB.VI but with Packard Merlin 225 engines and Canadian-American equipment.
T.27 Trainer. Canadian built trainer developed from the T.22 with Packard Merlin 225 engines.
FB.28 Model number allocated to Canada, not taken up.
B or FB.29 Dual control trainer development of FB.26, Packard Merlin 225 engines. All were conversions from FB.26's.
NF.30 Fighter. Developed from the NF.XIX with high altitude Merlin 72, 76 and 113 engines.
Mk.31 Reserved for a Packard Merlin engined night fighter variant which was never built.
PR.32 Photo-reconnaissance aircraft. Specially lightened version of the PR.XVI with Merlin 113 and 114 (two stage, supercharged) engines and extended wing tips for high altitude operation.
TF/TR.33 Fleet Air Arm version developed from the FB.VI for multi role operation. Merlin 25 engines, manually operated folding wings and pneumatic landing gear with smaller wheels.
PR.34 Photo-reconnaissance aircraft. Very long range development of the PR.XVI with Merlin 113 and 114 engines. This was the fastest version of the Mosquito managing 422mph in level flight.
PR.34a Modernised version of the PR.34 with a revised cockpit layout.
B.35 Bomber. Similar to the B.XVI except for Merlin 114 engines in early versions, Merlin 114A engines in later versions. 274 built, including 65 by Airspeed Ltd.
PR.35 Photo-reconnaissance aircraft. Ten converted from B.35's.
TT.35 Target tower. Modified from B.35.
NF.36 Fighter. High powered development of the NF.30 with Merlin 113 engines and American A.I. MK 10 radar. Armament consisted of four 20mm cannon.
TR/TF.37 Torpedo fighter/bomber. Similar to the T.33 with British ASV Mk. 13B radar fitted in a 'bull' nose.
NF.38 Fighter. Similar to the NF.36, fitted with British A.I. Mk 9 radar. Merlin 113, 114, 113A or 114A engines.
TT.39 Target tower. Target tower converted from B.XVI.
FB.40 Fighter. First Australian built Mosquitos, based on the FB.VI with Hamilton Standard or Australian built De Havilland hydromatic propellers. The first 100 aircraft were built with Packard Merlin 31 engines, thereafter, Packard Merlin 33 engines.
PR.40 Photo-reconnaissance aircraft. Australian built conversion of the FB.40. Packard Merlin 31 engines.
PR.41 Photo-reconnaissance aircraft. Australian built, similar to the PR.40 but with extra radio gear and Packard Merlin 69 (two stage, supercharged) engines.
FB.42 Fighter Bomber. Australian built adaptation of an FB.40 to take the Packard Merlin 69 engine. After testing, the project was dropped and the aircraft became the prototype for the PR.41.
T.43 Trainer. Australian built conversion of the FB.40 and almost identical except for the addition of dual controls and dual elevator trim tabs.