The two-seat biplane manufactured by the Hamburger Flugzeugbau subsidiary of Blohm & Voss was a means of giving the company experience in making modern metal components for civil and military aircraft.

After it proved unsuccessful in this role, the company sold it as a sport aircraft.

[1] The first prototype, designated the Ha 135 V1 (company production number 101, registration D-EXIL), made its first flight on 28 April 1934.

[1] The second prototype, designated the Ha 135 V2 (company production number 102, registration D-EKEN), made its first flight on 30 April 1934.

The Hamburger Flugzeugbau used it for flight characteristics and performance tests beginning on 14 July 1934.