"DIRTY DOZEN" 12 Mini-Motor Cluster

Ez3D Dirty Dozen model rocket:  Twelve Mini Motor Cluster

- I can burn two packs of mini motors in one shot with the x8 version, why not three packs with a x12?

- Includes black powder "Flash Pan" for ignition (also 3D printed). I really don't want to try (or expend) 12 ignitors for one flight....

- Parts tape together - No glue required!

After conquering the challenge of the "Ez3D-Mini", take a step up to the world of clusters!

Parts List:

1. Ez3D-13x12-80 Fin Can

2. BT-80 Nose Cone

3. Special 3D printed Motor Retainer Cap

4. Small motor mount retaining screw

5. Eighteen (18) inches of BT-80 type body tube

6. Five (5) feet of Kevlar string for Recovery Harness

- Flight tested on 9KM DWLIFE Black Braided Kevlar Cord (1.3mm, 300 lb) but others may work

7. 18" parachute

8. Tape

Assembly:

1. Tie Recovery Harness to hole in Fin Can

2. Thread Recovery Harness thru Body Tube

3. Slide Body Tube onto top of Fin Can

4. Tape Fin Can to Body Tube

5. Tie loose end of Recovery Harness to Nose Cone

6. Tie parachute to Recovery Harness near top of Nose Cone

NOTE: Individual printers and filament have different tolerances <br />

- Fit check items before assembly. Options to adjust if necessary:

- Add tape to increase diameter

- Remove material by sanding

- If your printer has a scaling feature, use it to adjust the part size

- Change the dimensions in the FreeCAD file available with the download

Recommended motors and expected performance:

- A3-4T or A3-6T (x12) = ~500 ft

IMPORTANT POST FLIGHT NOTES:

- 3D printed material shrinks after cooling down from heat of motor

- It shrinks even more after suffering the heat of TWELVE motors at one time. You will NOT be able to use the fin can again.

- PLA and ABS fin cans melted around the 12 motors. Consider them single use.