Pulsejet Powered Bicycle By Robert Maddox. Helmets Are Advised. RealTDragonJune 30, 2009 This is Robert Maddox pulse-jet powered bicycle. As you can see this baby has some guns and it can sure use them. You can go up to 70mph, and probably higher. This bike is one crazy bike and Robert Maddox is the coolest crazy dude for making it.