Pippi in the South Seas (1970) on Netflix

Plot summary

Annika and Tommy's parents leave them at Villa Villekulla for three weeks, in the company of their friend Pippi Longstocking. On an outing, the children come across a bottle holding a message from Pippi's father, Captain Longstocking, who calls for help. The pirate Blut-Svente and his men keep him locked up on Porto Piluse. Pippi decides to go to him and builds the Myskodil, a bed turned into a hot air balloon, carrying herself, Tommy and Annika. The balloon runs out of air and the bed lands on a mountain while the balloon drifts away. The three walk on to a rubbish dump, where crates, a propeller and an old bicycle become a pedal plane with a rudder, pointed at Porto Piluse.