In 1979, Raymond Mossoux, engineer at SABENA, designed an ultralight glider using the tandem wings formula of Henri Mignet. This small glider, very light (28 kg) could be carried by hand if you wanted to take off by running, landing being made on a skid.  

After several flights in glider configuration, towed by a car, a Mc Cullogh single cylinder 2 stroke, 95 cm3 (9 hp at 7,000 rev / min) engine was fitted on a pylon placed behind the pilot and between the wings. The design is then slightly modified when a 2 cylinders JCV engine of 20hp specially developed for the Butterfly is installed.
Butterfly characteristics :                       
Performances :
Length : 3,45m Cruising speed : 70 km/h
Wingspan :  front:  6,19m
                   rear:  4,36 m

Wing area : front: 6,94 m²
                  rear:  4,74 m²        

Empty weight : 48 kg  
Height : 1,6m
The “Butterfly” stored in the BAPA workshop is the Mc Cullogh powered prototype.  
Status: private collection on loan. Stored at the workshop pending completion.