@makesittickhq: Canal lock paddles and why the low ones open first. Ground paddles fill the lock from low in the chamber wall, so water slips in beneath the boat. Gate paddles stay shut until the rising water covers them, then open with just a swirl. Each paddle goes up a notch at a time. The bow stays dry, which the boat appreciates. Sources: Boaters' handbook (canalrivertrust.org.uk); Lock (water navigation) (en.wikipedia.org); Torricelli's law (en.wikipedia.org) #canallock #narrowboat #engineering #learnontiktok #canalboat

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Thursday 29 October 2026 19:18:03 GMT