Robbi, Tobbi und das Fliewatüüt is a popular German book for children by Boy Lornsen, first published in 1967.
The team travels in an all-in-one vehicle, designed by Tobbi and built by Robbi, to find answers to the exam's riddles all over the world.
Tobbi calls this vehicle (which runs on juice from red raspberries, later substituted by cod liver oil) "Flie-wa-tüüt" because: During their adventures young inventor Tobbi and his pilot Robbi have to tackle many challenges.
Robbi, Tobbi und das Fliewatüüt was first published by Verlag K. Thienemann [de], Stuttgart, in 1967.
Based on the novel, Robbi, Tobbi und das Fliewatüüt was adapted as a German television series for children by WDR in 1972.