He built a small single seater, the Ka 1 at his home in 1952 to perfect his design skills.
His next glider, the two-seat Ka 2, was created for Alexander Schleicher, the sailplane manufacturer in Poppenhausen.
Rudolf Kaiser also worked for Egon Scheibe designing the Ka 5 "Zugvogel" which was the best performing production sailplane in the world at the time.
After Schleicher put it into production, it became the most popular Standard Class sailplane, winning two World Gliding Championships (1960 and 1963).
Kaiser then designed three more classic gliders: The K 8 was a single seater with similar characteristics to the two-seaters and so it is still a popular glider for early solo pilots who had trained on Kaiser's two seaters.