24 ft. tall. 120 lbs. N to N to L-size motors. Adrian Carbine and team from Portland Oregon launched this three-stage tower late in the day making for some wonderful lighting. The CTI N4100 booster burns a brilliant red at takeoff. It then stages a CTI N1100 moonburner that will take the rocket well into supersonic speeds as it burns for 12.5 seconds. It appears that the third stage did not light, but it was out of sight for me. Each stage has it's own computer and parachute recovery system