Two years ago, Web developer Josh Smith and telecom engineer Brian Freed took their families sledding at an old ski resort in Pennsylvania but found that the 45-minute walk to the top of the 1,200-foot hill limited their runs. By the next winter, they had a solution to the problem: a homemade sledding lift. Built from a go-kart motor, the winch can pull three adults, or two adults with two children. The sleds are tethered to a rope that moves in a continuous loop over pulleys at both ends of the hill, pulling sledders 1,050 feet up. Riders can now make it to the summit in just three minutes. This year, the duo modified the winch so they can use it in the water during the summer for "winch boarding," a sport in which a surfer is towed speedily across the surface by the device.