Concept and Development
Professor Walter Blume, former chief designer of “Arado Flugzeugwerke GmbH”, began work in the mid-1950s on a project for a four-seater light all-metal monoplane. The prototype, the Blume Bl.500, was built by “Focke-Wulf” and made its first flight on March 14, 1957.
Technical Specifications
This aircraft was a cantilever low-wing monoplane, featuring a traditional tail unit and retractable tricycle landing gear. Its design emphasized efficiency and robustness for a light aircraft, aiming for optimal performance and ease of operation.
Production Variants
Two production variants emerged. The Bl.502, which shared the single Avco Lycoming O-320-A engine configuration with the prototype. The Bl.503, conversely, incorporated an upgraded Avco Lycoming O-360-A1A engine, delivering 180 hp (134 kW).
Technical Specifications
| Modification | Bl.502 |
| Wingspan, m | 10. 50 |
| Length, m | 8. 15 |
| Height, m | 2.40 |
| Wing area, m2 | 15.00 |
| Empty weight | 670 |
| Maximum takeoff weight | 1120 |
| Engine type | 1 Piston engine Lycoming O-320-A |
| Power, hp | 1 x 150 |
| Max. diving speed, km/h | 250 |
| Cruising speed, km/h | 205 |
| Practical range, km | 900 |
| Maximum rate of climb, m/min | 318 |
| Practical ceiling, m | 4800 |
| Crew, crew members | 1 |
| Payload: | 3 passengers |
Image and diagram gallery of the Blume Bl.502 Light Aircraft
 BL.502 |
 BL.502 |
 BL.502 |