Beaufighter Mk.IX proposed Australian-built variant with Hercules XVII engines, not built thumb|right|Beaufighter Mk. X Beaufighter TF Mk.X Two-seat torpedo fighter aircraft, dubbed the "Torbeau". Hercules XVII engines with cropped superchargers improved low-altitude performance. The last major version (2,231 built) was the Mk.X. The later production models featured a dorsal tailfin extension.Franks 2002, pp. 70–72.
Beaufighter MkIX proposed Australian-built variant with Hercules XVII engines not built thumb|right|Beaufighter Mk X Beaufighter TF MkX Two-seat torpedo fighter aircraft dubbed the "Torbeau" Hercules XVII engines with cropped superchargers improved low-altitude performance The last major version (2231 built) was the MkX The later production models featured a dorsal tailfin extensionFranks 2002 pp 70–72