High Power Rocket (HLA Skrilla)

This is the set of 3D models for my first attempt at a (mostly) entirely 3D printed rocket, HLA Skrilla.

This vehicle flown on multiple occasions with great degrees of success on rocket motors up through J class impulse. All parts on this rocket aside from the avionics bay, recovery harness, and motor mount tube are 3D printed. Fiberglass reinforcement (1 layer of 6oz glass) was applied to the fin can and couplers, although this was unnecessary as long as the prints are sufficiently strong.

All parts were printed in PETG with the exception of the couplers, which were printed in polycarbonate, but this was probably overkill. A standard size 4" avionics bay setup fits in-between the payload and booster sections. All parts were simply epoxied together with slow-cure epoxy and weight/clamps added for pressure where applicable.

Documentation on the assembly and testing of this vehicle is still in progress, but the assembly is pretty straight forward. The sections marked “booster” in the CAD can be glued together, with one coupler section getting glued on the forward end. The payload section is the same way, with the option of gluing the nosecone on, or leaving it able to be detached during ejection.

The motor tube is again a standard 54mm motor mount tube, with the motor centering rings spaced along its length. The smaller one should be on the forward end, as so it can fit into the aft end of the booster. An eye bolt/u-bolt should be attached to the small centering ring to act as an attachment point for the harness. A standard aeropack or z-clips can be used for motor retention.