Tuesday, April 2, 2019

Apogee SR-72 Darkbird Build Part 5, Pop-Pod Assembly & Streamer


This instruction drawing was a little confusing. It reads: "Glue four large centering rings . . ." The drawing only shows two wide rings.


Here's what they mean.
Four 5/20 centering rings, stacked and glued on the BT-5 pop pod tube. The top ring is even with the end of the tube.

The plastic cast hold down ring was too tight on the rear end of the pop pod tube.

It took some light carving and sanding on a dowel to get a friction fit.

The hold down ring is slid on.
I applied some Fabri-Tac glue fillets.

Fabri-Tac seems to be very good for plastic to tube joints. I wouldn't recommend it for delicate plastic bonding like the Estes Mercury Redstone capsule and tower assembly.
The red Mylar streamer is attached to the low end of the pop pod with a piece of tape.

With a A3-4 engine in place the pop pod assembly was balanced and marked. The taped streamer was centered on the balance point.
The balance point would have been more accurate if I used a spent engine casing.

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