I wanted a model rocket that retained the spent engine (I live in a dry area). But I wanted a recovery method that wasn't the usual parachute or streamer recovery.

Here it is: the Flutterby. On ejection, it separates into two parts: the tail, which retains the spent motor and tumbles back, and the nose, which retains one fin and comes back a bit like a maple seed.

It comes in 3 sizes: the Flutterby (for 18mm A/B/C motors), the Flutterby-T (for T-sized 13mm motors), and the Flutterby-D (for 24mm D-sized motors). I do not have a field large enough to test the Flutterby-D yet.

Printed in PETG. PLA is very unlikely to work, as it will be too brittle and heat-sensitive at the same time. Supports are not needed; just print the flat tube section at the bottom for Fore and Aft, and put the long straight section down for Fin (you'll need a brim).

Each comes in 3 parts: Fore, Fin, and Aft. Super-glue the Fore and Fin together to make the nose piece; a convenient hole permits a 1.75mm filament through-pin if you like. It's probably overkill. Assemble the 2 pieces around the rocket motor (it won't stay together without one). Align the fin with the two nubs in the back; this is an alignment aid only to keep the vehicle more or less radially symmetrical. If it's not aligned, stability can't be guaranteed.

Enjoy!