The Handley Page Halifax was designed to the same specification as the Avro Manchester. The specification was first published in September 1936. It was to be powered by four Rolls-Royce engines. In 1937 this was changed to four Merlins.
The Halifax was an all metal aircraft.
Early Halifax models had a two gun turret in the nose. This was later replaced by a Perspex molding model that had less drag.
Initially the Halifax had gun position at the beam windows, but these were later replaced by two or four gun dorsal turrets.
Original models had small tailfins. These were replaced by larger surfaces.
Halifax B.Mk I
The Halifax Mk I had no dorsal turret and the turret in the nose had two machine guns.
Halifax B.Mk II - Turrets
There are Boulton-Paul powered turrets in the nose, tail, top, and bottom.
Halifax B.Mk III
The Halifax Mk III had its later production models have span of 104' 2" / 31.75 m.
Some of the Halifax Mk IIIs were used with paratroops or towing gliders.
Halifax B.Mk V
The Halifax Mk V served with the Bomber and Coastal commands.
Some of the Halifax Mk V were used with paratroops or towing gliders.
The Dowty landing gear was installed.
Halifax B.Mk VIII
Some of the Halifax Mk VIIIs were used with paratroops or towing gliders.