This is stolen from similar designs, but may be useful for Big Daddy and other rockets. This is for my 4x24mm BD. It'll allow very fast swapping of nose weight modules (Estes yellow spacer tubes) if I want to fly two or four motors and can have tubes set for certain combos. Four E26s won't need as much weight as four E12s.
Since we need to cut off the shoulder of the nosecone and insert a bulkhead on these, I just used a centering ring.
Then, inserted a length of BT50 and epoxied where it meets the tip of the cone, to the centering ring, and then put a cream container cap thread on the aft end of the tube and bulkhead. These cap threads fit perfectly over BT50.
Make some weighted tubes with shot and epoxy.
Weight tube in first, empty tube as spacer. I need to make one small rear spacer of foam to cinch down under the cap to take out just a bit of gap. Then, put the cap on.
Since we need to cut off the shoulder of the nosecone and insert a bulkhead on these, I just used a centering ring.
Then, inserted a length of BT50 and epoxied where it meets the tip of the cone, to the centering ring, and then put a cream container cap thread on the aft end of the tube and bulkhead. These cap threads fit perfectly over BT50.
Make some weighted tubes with shot and epoxy.
Weight tube in first, empty tube as spacer. I need to make one small rear spacer of foam to cinch down under the cap to take out just a bit of gap. Then, put the cap on.