Part 4 of this blog series builds the upper "payload" section of the MK3A Rebel. If you missed Part 3 of this series, it is available at this link.
As stated in the assembly instructions provided with the kit, epoxy is required for kit assembly. I use quick drying 5 minute epoxy, but any two part epoxy is fine.
For Part 4, we will need:
- Nose cone (Part #1)
- Kevlar shock cord (Part #3)
- 18" Body Tube (Part #4)
- 0.25 inch screw eye (Part #2)
During this series of steps, preliminary work is done to prepare for painting the rocket. If you prefer to finish after the build is complete, omit those steps and proceed to the Assembly steps.
Preliminary Finish Preparation
- Similar to Step 3, fill the spiral groves in the 18 inch body tube (Part #4) with thinned Elmers Wood Filler.
- Once the filler is dry, sand flush to the body with 220 grit sandpaper. Be careful to not sand the top protective layer off of the tubes as it make the final finishing harder. The paper underneath will "fuzz up" when you spray with primer, which typically means more sanding.
- Once the spiral groove is filled and the filler sanded to your liking, spray the tube with a light coat of primer. I use Krylon gray primer.
- Set the tube aside to dry overnight. Like I mentioned in Part 3, I've found that lets the primer dry completely which makes it sand better. When completely dry, sand off the primer leaving the surface of the tube smooth.
- Screw the .25 inch screw eye (part #2) in to the hole in the base of the nose cone (part #1).
- Tie one end of the Kevlar® shock cord (part #3) to the screw eye (part #2) with a double knot. Apply a small amount of white glue to the knot to hold it firm.
- Apply a bead of epoxy glue inside one end of the 18 inch body tube (part # 4).
- Slide the Kevlar shock cord (part #3) through the 18 inch tube (part # 4) taking care to not touch the glue bead. Insert the shoulder of the nose cone (part #1) into the 18 inch body tube (part # 4) rotating as you insert to evenly spread the the glue.
- Set the assembled upper section aside to allow the glue to dry.
So we will break there for this post. In Post 5, I'll put the whole rocket together for the first time and get the parachute put together.
As always, I encourage you to take a look at the XROX Aerospace MK3A Rebel product page. This is a unique kit that is simple to put together and fun to fly.
Happy building and safe flying.
The sky is not the limit!