Source: Die Deutsche Luftrustung 1933-1945
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               Flug Revue 12/1977
Type 2-seat training plane allowed for aerobatic
Engine 1 Sh 14A with a 2-bladed propeller ,diameter 2.2 m
Dimensions Length 6.9 m, height 2.96 m, span 9.0 m,
Weights Empty 535 kg, flying weight (normal) 860 kg  (aerobatic) 740 kg
Performance Max. speed 195 km/h, endurance 3.5 h, range 610 km, service ceiling 4000 m
Type Werk.Nr Registration History
V1 101 D-EXIL First flight 28/4 1934 Used by the Fliegerübungsstelle Hamburg-Fuhlsbüttel (DLV)
V2 102 D-EKEN First flight 30/41934 Used by the Fliegerübungsstelle Hamburg-Fuhlsbüttel (DLV) Flight and performance tests from 14/7 1934. Later scrapped
103 D-ESYT First flight 17/12 1934 Used by the Fliegerübungsstelle Hamburg-Fuhlsbüttel (DLV), not registered after July 1938
104 D-ETEK First flight 22/3 1935 Used by the Fliegerübungsstelle Hamburg-Fuhlsbüttel (DLV)
111 D-EDLA First flight 8/8 1935 Used by the Fliegerübungsstelle Hamburg-Fuhlsbüttel (DLV), probably crashed after only a few flights
112 D-EKME First flight 5/8 1935 Used by the Flugabteilung (DLV) in Berlin-Adlershof, at least still used in 1940
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. It was developed as a trainer for the German Ministry of Aviation. After it proved unsuccessful in this role, the company sold it as a sport aircraft.

The first prototype, designated the Ha 135 V1 (company production number 101, registration D-EXIL), made its first flight on 28 April 1934. After the company used it for flight development with a BMW-Bramo Sh 14A engine installed, the German Air Sports Association flew it as a sport aircraft.

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. It also later flew as a sport aircraft with the German Air Sports Association.

Hamburger Flugzeugbau manufactured four more Ha 135s before production ceased.