Bulkheads
Bulkheads form an impenetrable block between two sections of a model rocket--typically, the section with the recovery device, and a payload bay. Bulkheads may be made of balsa wood, plastic, cardboard, or plywood, and are often used as attachment points for a recovery device.
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Plywood Bulkhead for 3 Inch Plastic Nose Cone
Rocketry Works
$4.99Great for addressing the difficulties fitting a parachute into short, squat 3 inch diameter rockets like the Big Daddy, this 1/8 inch thick bulkhead fits inside a 3 inch diameter blow molded nose cone, and you can use it to anchor a 1/4-20 eye hook for...RW-BULKHEAD 73MM PW 3MM$4.99