This rocket is a semi-scale version of the capsule from the NASA Mercury program. It has (3) 24mm motors in the abort tower.
The capsule itself started as an Atomic City 1/12 scale plastic model.
The tower is hand built from paper tubing & basswood.
When the canted triple cluster of motors in the tower fire their ejection charges the pressure front travels down the center tube and the 30" parachute rear deploys out of the bottom of the capsule.
Build Thread Link: Mercury Escape Tower Rocket | The Rocketry Forum