Luna-Inspired Model Rocket

I created this rocket design inspired by the Luna rocket from the 1950 film, Destination Moon - https://en.wikipedia.org/wiki/Destination_Moon_(film).

This model went through a number of prototypes and testing (test prints, swing tests, test flights, etc...) and is quite fine tuned. Engine retainer cap is hidden in boat tail to maintain a clean / elegant retro rocket look. Models launches w/ 13mm Mini Estes Engines. See launch video here (elongated model w/ 3 fins at 90 degrees): https://www.youtube.com/watch?v=rQBZ35dbxbo

There are a number of variants included -- both elongated version (looks more like rocket on the promotional poster for the movie) as well as a shorter version that looks like many other depictions of the rocket (this model is "semi-scale" and my parts / dimensions were measured from these pictures).

The original design included two fins/wings and a smaller tail fin + "kickstand". The side fins/wings were perpendicular to the tail fin. The STL files include a slotted body for this version. In addition, I also include another version slotted for similar 2 wing + tail-fin + kickstand version but with side fins/wings angled downward by 15 degrees to increase stability. Finally, I included a version with 4 larger slots to make a symmetrical model.

For the elongated model, I also added a symmetrical 3-fin slotted model (for making other retro rockets) as well as an unslotted body for those that prefer to add their own fin-mounting slots or want surface mounted fins. Slots are for 2mm fins but let me know if you need a different size.

I printed w/ .4mm nozzle and .2mm layer height. If you will launch this model be sure to use ABS or another heat resistant filament (I did ABS and it does great).

Engine mount is integrated into the body and no supports are required for printing any of the parts (I have a heated bed and print with a brim since these body tubes are tall and have relatively little contact with build plate). Shorter versions require nose weight to be stable (I originally used 10g but that was overkill and 5-7g should be sufficient). Elongated version may need 2-3 grams in nose depending on how much you sand the body, your other finishing, weight of fins, weight of parachute, etc... (my initial launch with no nose weight was very stable). I recommend a swing test.

I have included the option of printing nose cones in either a single piece or two pieces. The single piece has a small bevel between shoulder and top lip to avoid the need for supports. This can fit tightly in body tube with very little sanding to create a small bevel into top of body tube.

You will need to cut a couple of small supports off of the locking tab on the engine retainer cap and sand this a bit -- I added these manual supports so it can be printed without supports.

Please let me know if you encounter any issues and I can modify / update designs.