MANUFACTURER(S): Blohm and Voss - Nazi Germany
OPERATORS: Nazi Germany (cancelled)
LENGTH: 31.00 feet (9.45 meters)
WIDTH: 36.58 feet (11.15 meters)
HEIGHT: 9.19 feet (2.8 meters)
WEIGHT (EMPTY): 4,001 pounds (1,815 kilograms)
WEIGHT (MTOW): 5,324 pounds (2,415 kilograms)
ENGINE: 1 x Junkers Jumo 210Aa V-12 liquid-cooled inline piston engine developing 590 horsepower and driving a three-bladed propeller unit at the nose.
SPEED (MAX): 186 miles-per-hour (300 kilometers-per-hour; 162 knots)
RANGE: 357 miles (575 kilometers; 310 nautical miles)
CEILING: 22,966 feet (7,000 meters; 4.35 miles)
RATE-OF-CLIMB: 1,640 feet-per-minute (500 meters-per-minute)
Detailing the development and operational history of the Blohm and Voss Bv Ha 137 Dive Bomber / Ground Attack Aircraft Prototype.
Entry last updated on 5/24/2017.
Authored by Staff Writer. Content ©www.MilitaryFactory.com.
During the German military's build up of the 1930s, many aircraft types were developed to fulfill specific roles over the battlefield. Among these was the dive bomber which was eventually filled by the classic Junkers Ju 87 "Stuka" (detailed elsewhere on this site). However, before the Stuka became the core of the German precision bombing force, there was a competition between several design houses originating from a 1934 requirement and this involved both Henschel and Blohm und Voss.
Blohm und Voss, through their Hamburger Flugzeugbau arm, developed the "Ha 137". The director of the design became Dr. Richard Vogt who had just returned from developing warplanes for the Empire of Japan under the Kawasaki brand label. The new aircraft sported gull-wing style monoplane wings, a traditional single-finned tail unit, enclosed cockpit and fixed (tail-dragging) undercarriage. At the nose of the aircraft would be a single BMW XV inline piston engine driving a three-bladed propeller unit. Crew space allowed for a single crewman. The aircraft was known to the company as "Project 6".
Overall length was 31 feet with a wingspan reaching 36.6 feet and a height of 9.1 feet. Empty weight was 4,000lb against an MTOW of 5,325lb.
Blohm and Voss Bv Ha 137 (Cont'd)
Dive Bomber / Ground Attack Aircraft Prototype
Vogt's initial design submission was called to be reworked as the BMW XV engine was not to be. This led to selection of the BMW 132 instead, a licensed-production version of the American Pratt & Whitney "Hornet" air-cooled radial piston engine. The design was then revised to become "Project 6A". The British Rolls-Royce "Kestrel" engine was also in contention under "Project 6B".
The German Air Ministry moved to cover three prototypes based on the earlier work (V1 through V3) and this led to a first-flight of one of them on January 18th, 1935. The third prototype (V3) arrived with the Kestrel engine installed and three more prototypes were ordered with power stemming from the homegrown Junkers Jumo 210 series engine. Development continued into 1936.
As the competing Junkers Ju 87 had flown in September of 1935 and was introduced for service the following year, the Ha 137 had little chance of succeeding as anything by this point (a close-support role and navy version were both entertained). The remaining three prototypes (V4 through V6) were still built and became available in 1937 but, ultimately, these were used in test campaigns by Blohm und Voss.
As flown, the Ha 137 (the V4 prototype) managed a maximum speed of 185 miles per hour with cruising speeds of 180 miles per hour. Range was out to 360 miles and its service ceiling reached 23,000 feet. Rate-of-climb was 1,640 feet per minute.
Should it have been adopted for military service, standardized armament would have included 2 x 7.92mm MG 17 machine guns in the forward fuselage and 2 x 7.92mm MG 17 machine guns in underside fairings. Alternatively the latter could be substituted for 2 x 20mm MG FF automatic cannons. Beyond this fixed armament, there was provision for 4 x 110lb SC50 series conventional drop bombs.
Where applicable, the appearance of U.S. Department of Defense (DoD), Russian Ministry of Defense, Chinese Ministry of Defense or British Ministry of Defence visual information does not imply or constitute endorsement of this website (www.MilitaryFactory.com). Images marked with "www.MilitaryFactory.com" or featuring the Military Factory logo are copyrighted works exclusive to this site and not for reuse in any form.
Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.
Relative Maximum Speed Rating
This entry's maximum listed speed (186mph).
Graph average of 150 miles-per-hour.
Graph showcases the Blohm and Voss Bv Ha 137 V4's operational range (on internal fuel) when compared to distances between major cities.
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units