Blackburn B-3 S1640 first aircraft side view port
S1640, the M.1/30 prototype, with fabric-covered fuselage.
The Blackburn B-3 was one of three types ordered by the Air Ministry. for evaluation as a torpedo-bomber against Specification M.1/30, which sought a replacement for the Blackburn Ripon.
Blackburn Aircraft Company, Handley Page and Vickers Aviation responded with prototypes being ordered from each company. Of the two aircraft built by Blackburn Aircraft Company, the first (S1640) was subject to the official contract and was known throughout its life as the M.1/30.
It comprised of a pilot and observer/ gunner, who were seated in tandem cockpits, with the observer being able to access a prone bomb aiming position below the pilot’s cockpit floor. 
Construction was conventional, with a metal structure and fabric covering to both wings and fuselage. Unusually, the tailplane was mounted just above the top decking of the rear fuselage, whilst the wings could be folded to the rear, being hinged around their rear spar attachments. A wide track undercarriage allowed for torpedo carriage beneath the fuselage, whilst bomb racks were provided beneath the wings.
It was powered by an 825 hp liquid-cooled Rolls-Royce Buzzard engine, driving a 15 ft diameter, two blade propeller and it flew for the first time at Brough on 8th March 1932.
After completion of manufacturer trials, the Blackburn M.1./30 was delivered to Martlesham Heath for official trials, commencing on 29th January 1933. Unfortunately, it suffered an accident on 30th June 1933, reported as due to engine failure on take-off, and was it written off.
Blackburn B-3  S1640 after accident
The M.1/30 prototype S1640 following its accident at Martlesham Heath.
Meanwhile, Blackburn Aircraft had decided to build a second prototype, this time as a private venture and incorporating a number of improvements. This differed from the 1st prototype in having a metal, semi-monocoque fuselage, incorporating sealed compartments to provide buoyancy. It carried a Class B Civil Test Registration (B-3) although it soon became known as the Blackburn M.1/30A and was flown for the first time on 24th February 1933.
Blackburn B-3 M.1/30A metal skinned port side
The private venture second M.1/30A aircraft B-3 with metal-skinned fuselage.
Among the other changes introduced were a reduction in wing area of some 70 sq ft, achieved by reducing both the span and chord of the lower wings. The aircraft was also fitted with automatic slats and featured long-span ailerons that could also be lowered symmetrically, to act as camber-changing flaps. A third cockpit was also introduced for a dedicated rear gunner, as well as a sealed structural fuel compartment, which was introduced within the fuselage ahead of the pilot.
The Official Trials at Martlesham Heath commenced on 14th March 1933, where the type was condemned for having heavy controls and being overweight. The fuel-filled fuselage compartment was also strongly criticised although the sealed buoyancy compartments were regarded as favourable.
Blackburn B-3 second aircraft port front
The metal fuselage, private venture M.1/30A was used (as K3591) for ditching trials in 1934.
This resulted in the aircraft being taken on charge in May 1933 (as K3591), and in January 1934, it was transferred to the Marine Aircraft Experimental Establishment, specifically for ditching trials.
The aircraft was eventually salvaged after these trials, returning to the manufacturers for the assessment of the effects of saltwater corrosion.
Following this, the aircraft was sold as scrap.

Variants & Numbers Built

Two only: M.1/30 S1640, M.1/30A B-3 later taken on charge as K3591


Specification (M.1/30A)

Powerplant One 825 hp Rolls-Royce Buzzard IIIMS
Span 49 ft 6 in
Maximum Weight 10,393 lb 
Capacity & Armament Three crew; one forward-firing Vickers gun, rear MkIII Lewis gun in rear cockpit; One 1,900 lb Mk VIII or Mk X torpedo or equivalent (maximum 2,200lb) underwing bomb load
Maximum Speed 142 mph sea level; 130 mph 10,000 ft
Range  750 miles




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