David started his project in 1988 (mainly prosessing HTP and testing little thrusters) after studying the first tether test flights of Kinni Gibson. It took him to 1993 to start working his rocketbelt, first testing it in 1994. I had some very interesting conversations with him, specially on the extreem rare (pink) Bradburry Research rocketbelt book, what David wrote and published in 1991 (see the book chapter for more info). David and me had long email conversations in were he gave me a wealth on early rocketbelt design and construction. Special on the Airwalker/Bradburry rocketbelt construction books. Thanks again David. And if you read this, drop me an email!