This is a two stage rocket. What this means is that the rocket burns two motors, one immediately after the other.
The lower section of fins is called the booster section, and from there up is the sustainer. A motor is loaded into each section and then it is launched.
When the booster motor burns out it ignites the motor above it in the sustainer. When the sustainer lights it literally blows the booster section off the rocket which then tumbles down to the ground and is recovered.
This rocket is quite the high flyer for a low powered rocket attaining altitudes near 1700' under full power motors.
Again we have built two of these. We launched the first one at an organized launch under full power and were able to see it recover and hit the ground but by the time the kids got out there they had lost track of it and were unable to find it, so the sustainer is lost.
The second one is complete and ready for more flights.
Built 2-15-02 and 7-28-02. Uses 24mm motors.
Diameter is 1.33", Length is 28.38", and Weight is 2.7 oz. Parachute recovery.