First
of all - congratulations and many thanks to the Boy Genius for a job
very well done in completely redesigning the website. There'll be
plenty of new pages to view in the coming months.
As
most of my research has been concentrated on RAF Bomber Command's 1
Group I have largely neglected the Handley Page Halifax heavy bomber.
I know that aircrew who operated the Halifax were as loyal to their
type as those who flew the Avro Lancaster were to theirs. News came
to me this week from Canada where my good friend Ron had been in
conversation with a veteran of the RCAF who had remarked that
Halifaxes had the advantage of being able to shoot down
night-fighters below them. I was aware that the Lancaster had the
potential to have a ventral turret, but examples were apparently
rare. A quick search revealed that a trial was carried out in late
February 1944 to arm the Halifax bomber with a belly gun.
By
that time boffins had already come up with a powered gun-mounting,
operated remotely by a gunner sighting through a wide-angle
downward-viewing periscope which gave him only a split-second to aim
and fire. A more simple modification was sought – the
'Preston Green under defence mounting Mk.II'.
At
first glance Halifax III, LW650, taking off from Boscombe Down on
29th February 1944, looked like any other Halifax with an H2S radar
blister beneath its fuselage. However, the scanner housing had a
0.5in. Browning machine-gun set on a USAAF style mounting ring, an
aft-facing seat with a tilting back-rest was mounted in the scanner
blister for the gunner. The blister had a viewing aperture allowing
the gunner to search and the machine-gun mounting could be readily
swung clear to give him a clear field of view, but was easily locked
back into its firing position.
At that time H2S sets were deemed to be
an essential bombing aid - ND360 had been fitted with a set in
mid-January 1944 - but the supply of radar sets could not keep up
with the demand for retro-fitting in existing aircraft as well as for
the steady stream of new bombers coming out of the factories. New
Halifax B Mk IIIs would, for a while at least, be fitted with the
Preston Green mountings.
outlines details
of the Preston Green Mk.II as follows:-
Aircraft Halifax B Mk.III Position Mid-under Motive power Hand controlled Gun mounting Bell adapter (US) Armament 0.5in. Browning Mk.II Ammunition 200 rounds in box and 50 rounds in duct Field of fire Rotation 30° to each beam. Elevation between 45°-90° Gunsight Free gun reflector sight Mk.III Dia. of bowl 49in.
Fire
control
Manual or electrical.
The trialling of ventral guns at this
time suggests a continued awareness of the vulnerability of heavy
bombers to attack from below, but whether this was also an
acknowledgement that night-fighters were armed with upward firing
cannon is unclear.
Once
the production of H2S sets caught-up, the ventral gun
modification was superseded in favour of fitting radar scanners - a
decision made in favour of technology and the need to place bombs as
accurately as possible. Unfortunately German night-fighters' FuG 350
'Naxos' sets homed in on H2S emissions. Would the idea of having an
extra pair of eyes and a 0.5in Browning have been more appealing to
bomber crews than an air to ground radar set?