Qualman Rocketry

BT-sized Plywood Bulkheads
Don't let your screws pull loose!
Even low power rockets sometimes need high-strength components. Especially where you mount the shock cord.

If you want to affix your shock cord to a bulkhead, we strongly recommend using a plywood bulkhead.  It's got the strength to hold an eye screw, unlike cardstock and lighter-weight woods.

Our bulkheads come with pilot holes for eye screws.  Additionally, all plywood bulkheads BT-55 or larger come with a backer disk to make sure that you've got the strength to hold the bigger screw.  Just glue the disk in place as you insert the screw, and all will be aligned and secure.

To convert a coupler into a block for holding a shock cord, insert a coupler-sized bulkhead into the coupler.  Don't mount it flush outside of the coupler.  Note that due to the variations in coupler thicknesses, a little sanding may be required to make it fit.

For extra strength with rear-eject rockets, use a plywood bulkhead as a surface for the engine-mount to push against, and to provide a secure point to fasten the shock cord.

eye screws not included
Plywood Bulkheads, BT sized
Tube Size For tube
with inner
diameter of		 Qty/
set		 *Price Image
for BT20

 0.710"
18mm		 6
PB206
$0.89/set
for BT20 coupler
for inside the coupler
sand to fit variations amongst couplers		 0.666"
16.9mm		 6
PB20C6
$0.89/set
for BT50

 0.950"
24.1mm		 6
PB506
$1.49/set
for BT50 coupler
for inside the coupler
sand to fit variations amongst couplers		 0.880"
22.4mm		 6
PB50C6
$1.49/set
for BT55, w/ backer

 1.283"
32.6mm		 4
PB554
$1.49/set
for BT55 coupler, w/ backer
for inside the coupler
sand to fit variations amongst couplers		 1.225"
31.1mm		 4
PB55C4
$1.49/set
for BT56, w/ backer

 1.304"
33.1mm		 4
PB564
$1.49/set
for BT60, w/ backer

 1.595"
40.5mm		 4
PB604
$2.29/set
2 sheets
for BT60 coupler, w/ backer
for inside the coupler
sand to fit variations amongst couplers		 1.550"
39.4mm		 4
PB60C4
$2.29/set
2 sheets
for BT70, w/ backer

 2.175"
55.3mm		 2
PB702
$2.29/set
2 sheets
for BT70 coupler, w/ backer
for inside the coupler
sand to fit variations amongst couplers		 2.093"
53.2mm		 2
PB70C2
$2.29/set
2 sheets
for BT80, w/ backer

 2.560"
65.0mm		 2
PB802
$2.69/set
2 sheets
for BT80 coupler, w/ backer
for inside the coupler
sand to fit variations amongst couplers		 2.477"
62.9mm		 2
PB80C2
$2.69/set
2 sheets
* Parts are sometimes built to order.   Please allow 2-3 business days for production.

Copyright Qualman Rocketry, 2016