Original tutorial here.
I apologize for the low quality of the pattern, but I promise it works! Just because it’s drawn in Crayon doesn’t mean that it isn’t legit…
Make sure you size it so it fits 8.5 x 11 sheet of paper.
While the pattern looks simple enough, I suggest you follow it or else your hot air balloon may turn out rather deformed. You’ll need 6 of these pieces for a standard balloon. If you add more pieces, your balloon will be more spherical. This pattern includes a 1/4 inch seam allowancel
Good luck! Let me know if you have any questions.