Carbon fiber 2 stages rocket build.

The Rocketry Forum

Help Support The Rocketry Forum:

Zertyme

Well-Known Member
Joined
Mar 17, 2019
Messages
110
Reaction score
208
Location
France
Again, writing this while waiting for the prepreg to get to room temp...
After sanding down the tube a little bit I realized that some of the ridges were too high: to remove them I would have to sand down through too much fiber.
The third time the charm I suppose.

What I'm planning to change:
  • Turn the first layer around to maybe get more resin on the ID.
  • a layer of vacuum bagging film before the shrink tape to try and reduce the ridges.
  • tape dam on both edges of the layup to prevent the resin from escaping there (probably tacky tape)
  • Perhaps reduce the step over even more? But that would increase the pressure applied by the shrink tape.
IMG_20201231_102242.jpg


I forgot to mention that the Chemlease 2693w did a perfect release after the second use.
 

Zertyme

Well-Known Member
Joined
Mar 17, 2019
Messages
110
Reaction score
208
Location
France
IMG_20201231_142701.jpg

Tacky tape as dam

IMG_20201231_144122.jpg

Release-coated vacuum bagging film instead of mylar (I don't have any on hand)


IMG_20201231_155127.jpg

Shrink tape wrapped around.

1609462224524.png

Cooling down. I did notice a some resin bleed on the edges. But it's much better than last time.

1609462537404.png

The ridges are still... present. At this point, I think I need to change to another shrink tape (currently using Dunstone 220R).

1609463354333.png

After """"a bit"""" of sanding. Looks good to me.

1609463432176.png
 

Zertyme

Well-Known Member
Joined
Mar 17, 2019
Messages
110
Reaction score
208
Location
France
IMG_20210101_163629.jpg

The third time the charm, maybe.
I also want to try thermo shrinkable peel ply (Diatex 1500) + modifying my lathe for shrink tape winding.

I won't be working with composite for quite some time now as I won't have access to my garage : /
So fincan aside for a while.

Next up: Pro98 6gxl custom closure, interstage coupler.
 
Top