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Where does the balloon come from?

mp3 file of the author reading part of the introduction to the book

Where to get lightweight trash bags

Information about which supermarket trash bags can be used to make balloons.

Solar Tetroon Lift Calculator Spreadsheet

A spreadsheet to calculate the amount of lift generated by the four-sheet solar tetroon from the book.

wire free ufo

How to make a wire-free version of the long duration UFO balloon from The Hot Air Balloon Book

Solar Power data

Website links to information about solar radiation around the world

Camera Obscura Plans

Zip file containing plans and instructions to build a desktop camera obscura for drawing.