Originally Posted by blackshire

Yes, the Centuri Aero-Bat and Acro-Bat both ejected their motors like the Estes Space Plane. Even a "Quest-ized" version of this/these kit(s) using their metric body tubes and nose cones would be a good model (or models).

Rear-motor boost-gliders that eject their motors are "NAR-kosher" for flying at NAR-sanctioned events *if* the motor cases are recovered by streamer. For a relatively loose-fitting body tube such as the BT-30, the streamer can be taped to the motor and wrapped around it to provide a light friction-fit in the model. For a BT-20 size model, a short length of carpet thread or thin cotton twine can be taped to the streamer, with the other end being glued to the inside of the forward end of the motor. A small amount of wadding is inserted into the front end of the motor, and then the streamer and string are rolled up and inserted into the motor.