Qualman Rocketry

BT-sized Centering Rings for Multiple Engine Mounts

More Power!
Yes, we all want to build rockets with multiple engines per stage.

These mounts will make sure that you do it right.

You can mount two to four engines with these rings.  At least, as long as the engines will fit in the rocket's body tube.  We haven't figured how to fit more than will fit, yet.
  
BT-sized Centering Rings are here BT-sized fin aligning rings are here
Cardstock Rings for Multiple Engine Mounts, BT-sized
Inner and Outer
Tube Size		 # Engine Tubes Inner Tube Outside Diameter Outer Tube Inside Diameter Quantity *Price Image
BT05 to BT55
(plus 6 13mm thrust rings)		 2 0.541"
13.7mm 		1.283"
32.6mm		 6
(+6)
CR2x05556
$1.99/set
BT05 to BT55
(plus 9 13mm thrust rings)		 3 0.541"
13.7mm 		1.283"
32.6mm		 6
(+9)
CR3x05556
$1.99/set
BT05 to BT56
(plus 6 13mm thrust rings)		 2 0.541"
13.7mm 		1.304"
33.1mm		 6
(+6)
CR2x05566
$1.99/set
BT05 to BT56
(plus 9 13mm thrust rings)		 3 0.541"
13.7mm 		1.304"
33.1mm		 6
(+9)
CR3x05566
$1.99/set
BT05 to BT56
(plus 12 13mm thrust rings)		 4 0.541"
13.7mm 		1.304"
33.1mm		 6
(+12)
CR4x05566
$1.99/set
BT05 to BT60
(plus 6 13mm thrust rings)		 2 0.541"
13.7mm 		1.595"
40.5mm		 6
(+6)
CR2x05606
$1.99/set
3 sheets
BT05 to BT60
(plus 9 13mm thrust rings)		 3 0.541"
13.7mm 		1.595"
40.5mm		 6
(+9)
CR3x05606
$1.99/set
3 sheets
BT05 to BT60
(plus 8 13mm thrust rings)		 4 0.541"
13.7mm 		1.595"
40.5mm		 4
(+8)
CR4x05604
$1.99/set
2 sheets
BT20 to BT60
(plus 4 18mm thrust rings)		 2 0.736"
18.7mm 		1.595"
40.5mm		 4
(+4)
CR2x20604
$1.99/set
2 sheets
BT20 to BT60
(plus 6 18mm thrust rings)		 3 0.736"
18.7mm 		1.595"
40.5mm		 4
(+6)
CR3x20604
$1.99/set
2 sheets
BT20 to BT70
(plus 4 18mm thrust rings)		 2 0.736"
18.7mm 		2.175"
55.3mm		 4
(+4)
CR2x20704
$1.99/set
2 sheets
BT20 to BT70
 3 0.736"
18.7mm 		2.175"
55.3mm		 4
CR3x20704
$1.99/set
2 sheets
BT20 to BT70
 4 0.736"
18.7mm 		2.175"
55.3mm		 4
CR4x20704
$1.99/set
2 sheets
BT50 to BT70
 2 0.976"
24.8mm 		2.175"
55.3mm		 4
CR2x50704
$1.99/set
2 sheets
BT50 to BT80
(plus 4 24mm thrust rings)		 2 0.976"
24.8mm 		2.560"
65.0mm		 2
(+4)
CR2x50802
$1.49/set
2 sheets
BT50 to BT80
(plus 6 24mm thrust rings)		 3 0.976"
24.8mm 		2.560"
65.0mm		 2
(+6)
CR3x50802
$1.49/set
2 sheets
BT50 to BT80
(plus 8 24mm thrust rings)		 4 0.976"
24.8mm 		2.560"
65.0mm		 2
(+8)
CR4x50802
$1.49/set
2 sheets
* Parts are sometimes built to order.   Please allow 2-3 business days for production.

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