Fortunate to have access to this book years ago and watched his video. An amazing guy years ahead of his time. Military wouldn’t fund unless he could train a complete novice to fly. He approached a farm hand and trained him. They hoped to use in Vietnam war but couldn’t get passed 20 seconds flying time and they wanted several minutes. https://www.amazon.co.uk/ROCKET-DEVICE-DESIGN-FABRICATION-TESTING/dp/B009TGKRH2