Integrated Fin Can for supersonic flights on 38mm minimum-diameter rockets

thingiverse

I have flown this model several times to a speed of Mach 1.9, according to RockSim data, since the fins are always perfectly aligned every time. To assemble it, simply print it at 10% fill and normal printing speed with rafts and then attach a quarter-inch or so of epoxy around the fin can, about one-quarter inch above the bottom of an eighteen-inch-long motor/body tube that measures 38mm in diameter. This tube fits perfectly within Blue Tube tubes, allowing you to securely tie a golf ball to the top for weight. For additional support and protection against chafing, apply a layer of epoxy around the fins. Built-in components include launch rod lugs, rail guides (which are strongly recommended), and fin fillets that make assembling the rocket even more manageable. In as little as five minutes after completion, this 3D-printed model is ready to take flight with single-use Aerotech motors. These motors come in several varieties including the J270, I140, and I280, which have reached speeds of supersonic velocities during test flights.