The Sikorsky XBLR-3 was a four-engine bomber, designed in 1935-1936. The original XBLR-3 was a twin boom design with both pusher and tractor propellers and many gun stations. Sikorsky Aircraft was apparently not committed to building the machine, as experimental military aircraft of the period had to be developed at the contractors expense.
On 5 February 1935 US Army Air Corps initiated a study on the new heavy bombings long range aircraft category BLR-Bomber, Long Range. Wasn't this about the creation of an aircraft suitable for series production, but more about the conceptual study to demonstrate the contemporary possibilities in this regard. All work on this topic became strict secrecy and marked codenamed Project (d).
The development of the aircraft according to assumptions of the project took only two studios - Douglas and Sikorsky - and with them just USAAC concluded in the second half of the 1935 appropriate contracts. In July 1935 design company Douglas received the designation of the military XBLR-2, and the company Sikorsky-XBLR-3. Air force waited that both companies prepare for the preliminary and detailed design, its wooden mock-up joined and the first to perform and test the most sensitive parts and components of the structure. Prototypes of both bombers were to be delivered to the test until the end of March 1938.
Project joined XBLR-3 company Sikorsky - more known under the name of the Project. M5-35 - was developed in the second half of the 1935 and on 29 February 1936 it was submitted for the evaluation of the representatives of the USAAC. Sikorsky did not yet have any experience in constructing so large aircraft on land and in the development of the project was enormous XBLR-3 experience and some technical solutions obtained earlier in the construction of the S-40 and S-42 flying boats, and in particular military XPBS-1.
The proposed aircraft was to be a large metal structures, with classic chassis with front wheel concealed to the recesses in the front part of the hull, and the main wheels also internal. Trapeze wings of extension 9,11 equipped with flaps were in the aileron and the entire span. For the purpose of propulsion and joined the anticipated four 24-cylinder engines straight type Allison XV-3420 power after 1600 hp, which is actually a combination of two 12-cylinder HP V-1710 engines. Further details are not known to the defense of the aircraft - known weapons only that the tracing of the aircraft was equipped with a rotational arms back hull designed turret for the crew.
In March of 1936, the two companies have prepared wooden mock-up of its bombers, visited by experts from the aircraft. Tracing and assumptions construction joined XBLR-2 received a higher appraisal company Douglas, therefore continuing the work of military over the new heavy air bombing. Expected high costs prevented the simultaneous implementation of both projects and project XBLR-3 Sikorsky's was officially canceled. Until that time, in establishments Sikorsky included a wooden model XBLR-3 at a scale of 1/25, tested in an aerodynamic tunnel belonging to NACA Langley Research Center.
Despite the failure of the XBLR-3 project, Sikorsky mimicked his some solutions (e.g. wings and usterzenia) for the construction of the passenger boats flying VS-44A, civilian version patrol-bomber boats flying XPBS-1.
|wingspan||62.45 m / 203 feet|
|length||36.58 m / 119 feet|
|area||2 428.65 m|
|Mass takeoff weight||54,422 kg|
|speed maximum||355 km/h|
|maximum speed (full load)||319 km/h at a height of 0 m|
|speed cruising||209 km/h|
|maximum coverage (with a maximum of extra fuel, at cruising speed)||12,312 km|
|duration of flight||maximum 62 hours|
|propulsion||four 24-cylinder engines straight in the layout, liquid-cooled, the type of Allison XV-3420-1 power after 1193 kW (600 hp, 1622 KM) every driving metal 3-carbon propeller 4,57 m diameter transfer machines|
|Armament||missing data (at least one rotary wiezyczka strzelecka and bombs in the Chamber bombowej hull)|
|Label||Sikorsky Aircraft Division of the United Aircraft Corporation, Stratford, Connecticut, USA|
|Production||only project + mock-up|
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