![]() Plank_4 will provide the vertical support (45 degree cut on top, and flat on the bottom). Plank_2 is 48.26in long, and deepest cut is 4.57inch plank_3 is same dimension of plank_2, but no cut. angle_beta = 23.56, and is cut at 5.5 inch (the joint of plank_1 and plank_2) Plank_1 is cut by 45 degree and join the plank_2 as shown. The total width for the quarter pipe is 8ft. The depth of the platform I am going for 30 inch. In this plan, the ramp can go maximum of 3.3ft at 5.5ft radius. The deepest spot for plank_2 is ~4.57in (total 5.5 in for 2圆). The plank_2 is just providing the curve to screw the studs and surface. The plank_1 is touching ground, and no need to worry about the support, the plank_2 is screwed to plank_3, which is providing all the support. The 2圆 are cut by 45 degree angle, and screw together like the picture (in the same plane surface), and a 2x4 will run behind it and to make the frame for the platform. Cutting the 2圆 at 45degree, and stack them parallel, and a smaller piece on the end.Īs shown in the picture, the Radius is 5.5ft (the same size from my local skatepark), and the greens 2圆 the yellow is 2x4. Per calculation, I found that I can make the sidewall using 2圆 PT lumber, and I will use the 2x4 PT for the rest of the frame like most of the plans. I am thinking to use pressure treated lumber (2圆 or 2x4) to make frame (including the sidewall). It did not save much on the woods, but should save a lot of work for weather proofing the plywood. This plan can replace the plywood with 4 piece of 2圆x8ft PT lumber (4*$12=$48). It sounds a lot of work to weather proof those plywood. Most plans are using PT 3/4 plywood, which is over $70 for a 4x8 here, and I am worried about the water damage. Since I am in PNW, it means a lot rain in the winter. I am planning to make a 3 ft tall, radius of 5.5ft quarter pipe.
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