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My Plans

3½ Quarterpipe:

Skating Surface (2 sheets of each) - 1rst layer 3/8 inch plyboard (just get low quality sheathing) 2nd layer exterior grade 1/4 inch plyboard or 1/4 masonite (masonite sux here oin the east coast)

Transition Sides(1 sheet) -5/8 inch plyboard (low quality works)

Deck (1 sheet) - 1/2 inch plyboard (exterior grade)

2 x 4's - 50

alot of screws

Step 1:
Cut the transiton sides out
(borrowed from heckler)

                  1. Figure how much transition curve you want (in feet &
                   inches) and how much vert, if any.

                   2. Tie one end of the string around the push-pin and stick
                   it in the sheet as shown.

                   3. Holding the string taught, measure out exactly the
                   amount of transition (see step one) and mark this on the
                   string with an ink pen.

                   4. Tie the drafting compass to the other end of the string
                   and tighten it so the slipknot is right on top of the mark
                   you made.

                   5. Holding the string taut, swing the compass from the
                   sheet's edge in a quarter-circle, marking the template
                   with the chalk. You may need to move the contraption
                   around to get the desired curve and best use of space!

                   6. Place sheet on sawhorses and cut out templates


                   7. If you want to make a ramp with a decreasing
                   transition, you need to modify the above steps and instead
                   of using a push-pin, use a round object that is 6 inches
                   to 3 feet in diameter, such as a paint can or a round
                   garbage can. Attach the string to the round object and
                   somehow secure it to the wood in place of the push-pin in
                   step 2. As the string winds around the round object, it
                   will get shorter and your transition will become tighter.
                   This is called a decreasing radius transition and it is
                   very cool when making launch ramps and quarter pipes.
                   Experiment and eyeball in a cool tranny.

Now use these pictures as guidleines for the reast of the ramp:

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