Paul Poncelet started at SABCA as a foreman. Passionate about gliding which was starting across the Rhine, it was not long before he designed a glider, which he built with primitive means after his daily work, and devoted his evenings to it for eight months. On February 10, 1923, his glider – the first airplane without an engine to fly in Belgium -, called “Castar”, was brought to Haren at SABCA, where the pilot Victor Simonet made the take-off, launched pulled taut by helpers.