Mosquito NF. Mk XIX, production number MM650 of 157 Squadron, Swannington, Norfolk, late 1944.

De Havilland Mosquito NF Mk VI: Projected night-fighter in parallel with FB Mk VI, not built.

De Havilland Mosquito NF Mk X: Proposed night fighter, similar to NF Mk II with Merlin 61 engines. Not built.

De Havilland Mosquito NF Mk XII: Night fighter derivative of Mk II with AI Mk VIII radar in 'thimble' nose replacing nose machine guns. Two prototype Mk II conversions at Hatfield mid-1942 followed by 97 by Marshalls at Cambridge, 1943. Initial deliveries to No 85 Sqn, February 28, 1943.

De Havilland Mosquito NF Mk XIII: As Mk XII but based on FB Mk VI, with provision for wing drop tanks, and Merlin 21 or 23 engines. Total of 270 built, delivered February 1944 onwards.

De Havilland Mosquito NF Mk XIV: Proposed production night fighter, as Mk XIII with Merlin 72/73 engines. Not built.

De Havilland Mosquito NF Mk XV: Specialised high-altitude night fighter, with pressure cabin, Merlin 61, 73 or 77 engines and span extended to 59 ft 0 in (17.98m). Prototype flown September 14, 1942, with guns in nose as single-seater and in November as two-seater with AI Mk VIII in nose and four guns in ventral pack, followed by four similar production conversions of Mk II airframes in 1942-43. Issued to No 85 Sqn March 1943, operated at altitudes up to 44,600 ft (13,594m).

De Havilland Mosquito NF Mk XVII: Similar to NF Mk XII but fitted with American SCR 720 (AI Mk X). First flown March 1943, and total of 90 converted from F Mk IIs by Marshalls of Cambridge in 1943 after one prototype at Hatfield.

De Havilland Mosquito NF Mk XIX: Similar to NF Mk XIII but fitted with American SCR 720 (AI Mk X) radar in 'bull nose' fairing able to accommodate either US or British equipment, and Merlin 25s. First flown April 1, 1944; 280 built.

De Havilland Mosquito NF Mk 30: As NF Mk XIX with two-stage 1,680 hp Merlin 72s; later 1,710 hp Merlin 76 and finally 1,690 hp Merlin 113 engines. First flown March 1944; 530 built and operational service began June 13, 1944, with No 219 Sqn.

De Havilland Mosquito NF Mk 31: Proposed variant of NF Mk 30 with Packard-built Merlin 69s. Not built.

De Havilland Mosquito NF Mk 36: As NF Mk 30 with Merlin 113 engines and British AI Mk IX radar. First flown May 1945 and 163 built for post-war service.

Bibliography

• "Encyclopedia of military engineering" /Aerospace Publising/
• "British warplanes of World War II" /under cor. Daniel March/