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Backyard 4.2G Roller Coaster
Will from London is like the calm version of Colin Furze, creating his own dangerous and over-the-top contraptions in his UK backyard, but minus the shouting. In this clip, he shows off a wood and PVC roller coaster that uses compressed air to produce 1200 lb. of thrust, and accelerating its sled at up to 4.2G. Build video here.