![]() Once the jumps were packed, Weiss and his crew wet and repeatedly tamped down the dirt as it dried, to make sure it was solidly packed. The slope is smooth right up to the lip the top of the mound is flat. A launch ramp with a 30 to 40 percent slope will give a rider maximum distance, while a steeper incline adds airtime and height. high, with a 2-ft.-long launch side, a 4-ft.-long landing ramp and at least 6 ft. For his course, Weiss used a wheelbarrow and a borrowed dump truck.Įach jump has two slopes: a launch ramp and a landing ramp. And while it's possible to move the dirt with a wheelbarrow, renting a small Bobcat makes the job easier. Just about any dirt will do for constructing jumps, but the National Bicycle League suggests a mix of 80 percent clay and 20 percent sand for an easy-to-pack mound. First, you need to come up with a general idea depending on what shape the space available is in and then start adding dirt and mud to shape out the park. "I wanted to make sure every connection was rock-solid," he says. plywood on the other side, then bolted all three layers of wood at each vertical member. Fastening the tiebacks to the studs where the angled and vertical portions of the wall met was tricky: Popham ran the tiebacks to one side of the joint, added an extra gusset tied from 3/4-in. (These studs are notched at the base so they can fit snugly into decking-joist hangars that are screwed into the bottom ledger.) A 32-in.-high vertical section tops off the structure. He used tiebacks attached to the ledgers with galvanized brackets to fix 2 x 6 vertical studs in place, which were spaced 16 in. ![]() Whatever the exact size of your ramp, youre going to need a flat piece of ground to. Popham secured four 12-ft.-long horizontal ledgers through the building's siding into the interior wall studs with 4-in. 1.The ramp were building is 3 feet high, 12 feet wide and 24 feet long. Opt for beefy framing members and heavy bolts and deck screws rather than nails, and use galvanized framing connectors for strong joints. ![]() This is one structure that can't be overbuilt.
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