FS2004/FSX – Spitfire Mk Vb And Mk VcTrop. The basic Mk V was a Mk I with the Merlin 45 series engine. This engine delivered 1440 hp (1074 kW) at take-off, and incorporated a new single-speed single-stage supercharger design. Several Mk I and Mk II airframes were converted to Mk V standard by Supermarine and started equipping fighter units from early 1941. With the advent of the superb Focke Wulf Fw 190 in August 1941 the Spitfire was for the first time truly outclassed, hastening the development of the “interim” Mk IX. In an effort to counter this threat, especially at lower altitudes, the VB was the first production version of the Spitfire to use “clipped” wingtips as an option, reducing the wingspan to 32 ft 2 in (9.8 m). The clipped wings increased the roll rate and airspeed at lower altitudes. Tested in FS2004/FSX/FSX Acceleration. Gmax model by A.F. Scrub.