Paper Hot Air Balloons
The weight of the paper should be similar to that of commercial tissue
2) Stiff card for making a template.
3) An adhesive: any paste or glue you would normally use to glue paper. A squeezable liquid glue pen that features a pad applicator is a convenient alternative to a brush and paste.
4) A 30" length of wire for the bottom ring. A thin wire coat hanger works well.
5) A campstove, a hair dryer or heat gun.
6) If you use a campstove for your source of heat, you will also need an 18" length of 6" diameter pipe.
7) An eight-inch length of string to make a loop at the top of the balloon.
8) A broom handle or stick with a hook on the end to support the balloon while being filled with hot air.
First make a template out of cardboard or stiff card stock following the dimensions given in Figure 1. Pile the eight sheets of paper on top of one another. Lay the template on top and, using a sharp cutting blade, cut through all eight sheets at once.
Take two of the gores and lay one on top of the other, slightly offsetting the top gore to one side by 3/8" ( see Figure2). Apply glue to the lower panel along the 3/8" margin and fold it over onto the top panel. Glue and fold immediately as you work along the length of the panel.
Lay a third panel on top of the two just glued, but this time offset the panel to the opposite side (see Figure 3). Glue and fold as you did the first time creating an accordion fold. Continue in this manner until you have glued all eight gores. Check often to see if any of the panels are being glued in the wrong place.
Now lift the unglued edge of the top or eighth panel and fold panels two through seven in half into the center leaving the edges of panels one and eight to be glued together like the rest, completing the circle (see Figure 4). Check once again that there are no areas glued that should not be.
While the balloon is still folded cut one inch off the crown. Tape a short piece of string to the eight-inch diameter circle of paper creating a loop and glue the circle to the top of the balloon to close the hole.
Next make a hoop from the coat hanger about nine inches in diameter plus an overlap. Size the hoop by opening it inside the neck of the balloon an inch from the bottom of the gores. Remove the sized hoop and tape the overlap. Make eight tabs in the neck of the balloon by cutting one-inch deep cuts between each of the eight seams (see Figure 5).  Pin the wire hoop in place by gluing and folding over the tabs. The wire hoop serves two purposes-to weigh down the bottom of the balloon so that it is more stable in flight and to create an opening, making it easier to fill with hot air. Now inflate the balloon with hot air using a hair dryer or heat gun and repair any unglued seams or holes. This should be done indoors.  Your hot air balloon is now ready to launch!