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. The “Butterfly” at BAPA workshop is the Mc Cullogh powered prototype, it is being reconstructed using available spare parts.