Whirlwind savvy.
HAR Mk 1 and Mk 3 RN with Pratt and Wright piston engines
HC Mk2 and Mk4 RAF Ditto
Series 1 Civil equivalent of HAR Mk 1...Bristow ,C Salvensen, Shell etc
Mk5 RN trials variant Mk3 with Alvis Leonides engine.
Mk HAS 7 RN with Alvis Leonides engine
Series 2 Civil equivalent....and military export.
MkHCC8 Queens Flight version of Series2
Mk9 RN conversion with Gnome turbine
Mk10 RAF new build and conversions with Gnome
Series 3 Civil equivalent....and military export.
Mk HCC12 Queens Flight version of Mk10