Ez-18x4

Ez3D 18x4 Four 18mm Motor Cluster

• Includes black powder "Flash Pan" for ignition (also 3D printed)
• Parts tape together - No glue required!
  ** NEW MOTOR RETENTION SYSTEM AS OF 4 OCT '25 / Uses single screw instead of four tiny ones that are difficult to attach in the field *****

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

Parts List:

1. Ez3D-18x4-70 Fin Can
2. BT-70 Nose Cone
3. Special 3D printed Motor Retainer Cap
4. One small sheet metal or wood screw
5. Eighteen (18) inches of BT-70 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

- 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 at https://github.com/Ez3D-Rocketry

Launch Preparation:

1. Insert 1 or 2 squares of recovery wadding into Body Tube
2. Load Recovery Harness and Parachute into Body Tube
3. Place Nose Cone on top of Body Tube - ensure slightly snug fit
4. Load motors into Fin Can
5. Secure Motor Retention Cap onto base of Fin Can with small screw
6. Launch using lots of ignitors or black powder flash pan for reliable simultaneous motor ignition and additional excitement

IMPORTANT POST FLIGHT NOTES:

• 3D printed material shrinks after cooling down from heat of motor
  -- It shrinks even more after suffering the heat of several motors at one time. A PLA fin can will last one flight. ABS may last several flights.

Flight Test Information:

2-22-2025 C6-7 (x4), 312g, flash pan ignition. Motors could be be removed.
8-09-2025 C6-7 (x4), Fin can melt!
10-04-2025 C6-7 (x4), 323g, 727ft (Alt2), flash pan ignition. Two motors loose - two motors tight

07-11-2026 C6-5 (x4), 350g, 863 ft (AudrelMax), PETG, First flight of v2 fin can. C6-7s will work better. All motors easily removable.