Semroc's cc:X-21 is a rocket glider that is a modernized version of the Centuri X-21. Here is the original description for the 1964 Centuri catalog: "Boost-glide aerospace vehicle! Exciting Performance! Advanced design! Plastic payload compartment! Controllable! Rocket powered flight straight up - hundreds of feet - then glide return for a soft landing. Successor to Centuri's famous Aero-bat, ...
The Semroc cc:X-21 is a boost glider with an elastic cord that pulls the elevons up to shift into glide mode after the motor is ejected. The kit inlcudes 1 body tube with a clear payload section and a balsa nosecone. This is a glider with broad swept wings. There is an elastic cord that pulls the elevons up but you also have a stiff string that is anchored in between the motor mount and ...