How to Make Tyvek Kite

Place the Tyvek envelope vertically on a table with the front facing the table. Cut the top and bottom seams open, but do not cut the side seams on the longer sides.

Measure and mark a point on the back of the envelope that is a third of the way from the top and exactly halfway between the two sides. Use a ruler and draw lines from this point to all four corners. You will have a sort of X shape drawn on the envelope.

Cut only the back of the envelope along the four lines. Do not cut the front of the envelope. You will have to pick up the back layer with the lines on it to cut it, so leave the front intact. Discard the two triangles you cut out.

Turn the envelope over and fold out the two triangular flaps you cut out in Step 3. Now you have a six-sided shape with two vertical creases. This is the basic shape of the sled kite.

Place a piece of cellophane tape covering each side point of the sled kite. Wrap the tape around the points and cover both the back and front to reinforce them. Trim off excess tape and punch a hole in the points through the tape.

Tape a wooden dowel vertically along each crease in your kite. Use three or four pieces of tape each and place them at a right angle to the dowels to secure them to the Tyvek.

Tie one end of a 3-foot piece of string to each hole you made in Step 5 to form the sled kite's bridle. Find the exact center of the bridle and tie a knotted loop in it. Tie more string to this loop and your sled kite is ready to fly.