The Falkirk Wheel Lifts Boats Using No Net Weight
The world's only rotating boat lift raises barges 35 metres on the energy it takes to boil eight kettles.
Scotland’s Falkirk Wheel, opened in 2002, is the world’s only rotating boat lift, swinging canal boats 35 metres between the Forth & Clyde Canal and the higher Union Canal in a single graceful turn.
Its secret is Archimedes’ principle: a floating boat displaces its own weight in water. So when a boat enters one of the wheel’s two water-filled caissons, exactly that weight of water spills out. Each caisson therefore always weighs the same — around 250 tonnes — whether it holds one boat, several, or none at all.
With the two arms permanently balanced, the wheel barely has to fight gravity at all. A set of motors and a clever train of gears keep the caissons level as they rotate.
A full half-turn uses just 1.5 kilowatt-hours — about the energy needed to boil eight kettles of water.
The result is a 1,800-tonne machine that lifts boats skyward on almost nothing.
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