The type was subsequently developed into the Bristol Type 149 Bolingbroke (Blenheim IV), Bristol Type 152 Beaufort and the Bristol Type 160 Bisley (Blenheim V), which are described separately elsewhere on this website.
Although arguably obsolescent against the best German fighters, the Bristol Blenheim gave most valuable service on operations in the early part of the Second World War.
The production numbers are widely quoted as 1,134 in the UK (634 Bristol, 250 AV Roe & Co Ltd, 250 Rootes Securities) plus 45 in Finland and 16 in Yugoslavia for a total of 1,195.
The Bristol Blenheim IF was a long-range night-fighter version, with a pack of 4 x 0.303 forward firing machine guns mounted under the fuselage and around 200 aircraft were converted to this role.
A single Blenheim I was converted to Blenheim II. It was fitted with long-range fuel tanks and had a maximum weight of 14,000 lb thereby allowing for an increased bomb load to be carried. This aircraft led to the Bristol Type 149 Bolingbroke (Blenheim IV), which was built in the UK and Canada and is described separately.
Bristol Blenheim Mk1 Image Gallery
Specification (Blenheim 1)
|Powerplant||Two 840 hp Bristol Mercury VIII|
|Span||56 ft 4 in|
|Maximum Weight||12,250 lb|
|Capacity||Three crew (pilot, navigator / bomb aimer, gunner). Fixed forward firing Browning gun in port wing, one Lewis gun in dorsal turret, internal bomb load 1,000 lb. The Blenheim IF carried four additional forward firing Browning machine guns in an under-fuselage pannier.|
|Maximum Speed||285 mph|
|Endurance / Range||1,125 miles|
|Blenheim I||A total of 1,195 Blenheim I aircraft were built including licence production in Finland and Yugoslavia. See also Bristol 149 Blenheim IV / Bolingbroke, Bristol 152 Beaufort and Bristol 160 Bisley / Blenheim V.|
|Blenheim I||No original Blenheim I aircraft survive.|
|Bolingbroke Mk IVT (RCAF10201)||This aircraft was rebuilt at Duxford, flying in May 1993. Following an accident in August 2003 the aircraft was again rebuilt, this time with a Blenheim I nose, flying in November 2014, painted as Blenheim I L6739.|