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Variants
Blenheim Mk I Initial production
model, (1443 built)
Blenheim Mk IF Long range
heavy day/night fighter version, additional armor, reflector gunsight and
4 ventral carried
(7.7 mm) machineguns, nose became less glazed
to avoid the pilot being blinded during night sorties, become to be used
exclusively as a night-fighter due to bad performances against more heavily
armed single-seat monowing fighters, in that role it received the AI Mk
III, later Mk IV radar. (200 built)
Blenheim Mk IV Improved Mk
I, longer nose, outer wing tanks, more potent powerplants (Mercury VIII's,
later Mercury 25's). (80 built)
Blenheim Mk IVL Intended long
range version of the Mk IV, with the outer wing tanks in use, and the powerplants
changed to Mercury XV. (3808 built)
Blenheim Mk IVF Night-fighter
modification of the Mk IV, had added some additional armor, reflector gunsight,
4 ventral carried (7.7 mm) machineguns and extra radio equipment, unlike
the Mk IF, was used for day and night operations. The night versions received
the AI Mk III, and later the AI Mk IV radar, unknown number were converted
from Mk. IVL version.
Bolingbroke Mk I Canadian
version of the Bleheim Mk. IV, built by Fairchaild Aircraft Company, powered
by Mercury VIII's, imported from Great Britain (18 built)
Bolingbroke Mk IV Intended
for use as reconnaissance aircraft, powerplants were Mercury XV, had a
life-raft, interchangeable landing/ski gear, and de-icing boots on the
flying surfaces. (137 built)
Bolingbroke Mk IV-W Equiped
with 2 × Pratt & Whitney R-1535-SB4-G Twin Wasp Juniors, later
adoptions saw the use of the Mercury XX radials, to be able to use lower
octane fuel (93 octane) than the Mercury VIII (100 octane).
(14 built)
Bolingbroke Mk IV-T The change
of U-boat activity preemted further use of the Mk. IV, thus the remaining
aircraft were delivered as trainers for navigation and gunnery. (457 built)
Blenheim Mk V Also called
the Bisley Mk I, used for close air support and low-level bombing raids,
fitted with 2 Bristol Mercury XVI radials, more changes concerning armament
and armor, and the use of the Mercury XXV and XXX powerplants revised the
type's name back to Blenheim, Mk V this time. Mk VA was to be a bomber
version, Mk VB to be an attack fighter. The Mk VC was a trainer with dual
controls without dorsal turret, and the Mk VD was the tropicalized version
of the Mk VA. (at least 942 built)
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