BT Cardstock Bulkhead

BT-sized Cardstock Bulkheads
Stop the gasses from getting there!

Sometimes, we just need to seal off the rockets.

It might be to convert a centering ring into a block.

It might be to make a paper transition.

It might even be to give a surface that a rear-eject engine mount can push against.

We've got the bulkheads you need.

Just be sure that you glue them securely in place.

Note that there are no firm standards for couplers, so the bulkheads that fit inside of a coupler might need to be sanded down a bit.

For rear-eject rockets, we have special cardstock bulkheads. They come with a crossover reinforcement, to keep from being deflected by the pressure.

They also have two separate points built in to attach a shock cord. One is in the center, the other near the perimeter. During assembly, simply insert the cord through the provided hole, down around the crossover, and then back through the hole. Then tie the cord and glue it into place.

BT-sized Cardstock Bulkheads

Inner and Outer
Tube Size

For tube
with inner
diameter of

Qty/
set

*Price

Image

for BT05

0.515"
13.1mm

12

CB05C

$1.19/set

for BT20

0.710"
18mm

6

CB206

$1.19/set

for BT20 coupler
for inside the coupler
sand to fit variations amongst couplers

0.666"
16.9mm

6

CB20C6

$1.19/set

for BT30

0.725"
18.4mm

6

CB306

$1.19/set

for BT40

0.765"
19.4mm

6

CB406

$1.19/set

for BT50

0.950"
24.1mm

6

CB506

$1.19/set

for BT50 coupler
for inside the coupler
sand to fit variations amongst couplers

0.950"
24.1mm

6

CB50C6

$1.19/set

for BT55

1.283"
32.6mm

5

CB555

$1.19/set

for BT55
Reinforced with crossover backer
for rear-eject, etc.

1.283"
32.6mm

1

CBX551

$0.79/set

for BT55 coupler
for inside the coupler
sand to fit variations amongst couplers

1.225"
31.1mm

5

CB55C5

$1.19/set

for BT56

1.304"
33.1mm

4

CB564

$0.99/set

for BT60

1.595"
40.5mm

4

CB604

$1.99/set

2 sheets

for BT60
Reinforced with crossover backer
for rear-eject, etc.

1.595"
40.5mm

1

CBX601

$0.79/set

for BT60 coupler
for inside the coupler
sand to fit variations amongst couplers

1.550"
39.4mm

4

CB60C4

$1.99/set

2 sheets

for BT70

2.175"
55.3mm

2

CB702

$1.29/set

for BT70
Reinforced with crossover backer
for rear-eject, etc.

2.175"
55.3mm

1

CBX701

$0.99/set

for BT70 coupler
for inside the coupler
sand to fit variations amongst couplers

2.093"
53.2mm

2

CB70C2

$1.29/set

for BT80

2.560"
65.0mm

2

CB802

$1.49/set

2 sheets

for BT80
Reinforced with crossover backer
for rear-eject, etc.

2.560"
65.0mm

1

CBX801

$0.99/set

for BT80 coupler
for inside the coupler
sand to fit variations amongst couplers

2.477"
62.9mm

2

CB80C2

$1.49/set

2 sheets

* Parts are sometimes built to order. Please allow 2-3 business days for production.

Copyright Qualman Rocketry, 2016