Retro Spacer - 3D Printed High Power Rocket

thingiverse

Have fun! The .zip file has all the files and instructions found here: https://a360.co/2V2deyP. More information: This is a proof of concept rocket model that proves itself well-suited for mid-power and small high powered (HPR*) flight. Having personally successfully flown a CTI F-85, which is technically a high-powered motor, to 1,671ft and recovered the rocket safely. This current model uses a 24mm motor mount, allowing for reloads. The plan is to scale this model up for 29mm motors and prototype it further. The goal is a successful H-impulse powered flight, which can be used as a Level 1 certification model that can be entirely 3D printed for low cost by the flyer. Features: 1) Low-cost, easily printable design. 2) Removable and replaceable fins make certification easier, even with broken fins. If the flier can demonstrate to the certifying authority (NAR, TRA, MDRA) that the fin is in fact replaced and the rocket can easily fly again, then certification chances are improved. 3) Positive motor retention using an Aeropack aluminum retainer to hold the motor and motor casing securely in place. 4) Chute baffle: protects parachute from motor ejection flash. It's still recommended to use wadding and/or nomex for flame suppression, however the baffle does work effectively. 5) Ample available space in nose cone for electronics. Only a slight modification to the nose cone bulkhead would be necessary for access. Future Plans: - Scale up to 29mm motor mount to fly H and I-impulse motors for Level 1 certification. See https://www.thingiverse.com/thing:4563511. - Launch Lug modification suitable for launching on a 1010 rail or up to a 1/4" rod. - Redesigned Nose Cone bulkhead for access (electronics, altimeters, GPS, etc.). - Redesigned baffle to support insulation for blast protection. - Redesigned fin can for positive retention of removable fins. - Camera bay in payload section. - Integrated AV bay for flight computer and battery (typically Missile Works, so most likely RRC2+ or RRC3). This wouldn't be dual deploy, but as an alternative for motor ejection, or as a backup to motor ejection. It could be dual deploy with tumble followed by a chute tender or cord cutter, but that would be up to the flier to do that. Note: While this model can simply be built for display...it's kinda cute, it is meant to be flown. HPR, means High Powered Rocket. These are NOT Estes type model rockets. While a 24mm composite motor is not "big" it is exponentially more powerful than even big Estes D or E black powder motors. Flight is meant to be controlled and by knowledgeable rocketeers who adhere to strict safety protocols and procedures.