His rocket is known as Project R.U.S.H., which stands for Rapid Up Super High. It is fueled by hydrogen peroxide and is equipped with parachutes for use when landing. The goal of the project is to launch Walker 50 miles into the sky. He currently is waiting for approval to launch 20 miles in a rocket-propelled aircraft from the world's largest crossbow.
Note that no large rocket has ever been launched by this individual, and that he has not yet made any of the hydrogen peroxide propellant, essential to flight. This task is both difficult and dangerous. The closest he has come to building a rocket is to make a few hydrogen peroxide motors which are useless without propellant.
Mr. Walker's own website http://www.rocketguy.com/ has gone off-line.