Garth and Bev - Jet Engine

Animation about a time-travelling brother and sister called Garth and Bev, who live in harmony with nature in their village. They are transported to different times and places by the Time Spiral and solve problems with the help of Grandfather Lir. Morc and Skelly set a wager as to whose boat would win a sea race to the rocks and back, and somehow Garth and Bev become mixed up in the challenge. It's all at sea when the oars are lost overboard. The children take inspiration from jellyfish to find a way of propelling the boats back to shore: it's a little like how Frank Whittle used jet propulsion to make planes go really fast through the air.