Estes Star Speeder #1366 Build, Part 6, Engine Mount

The upper end of the engine hook is set into a notch, 2 1/2' from the back end of the BT-20 main tube. A Mylar retaining ring is glued over it.

The 20/50 Split ring if glued 1/8" from the back end.
TIP: Here I slipped a scrap piece of BT-50 ove the split ring to keep the ends down as it dried. The BT-50 tube is slid off after the glue dries.

The notched offset 20/55 centering ring is glued against the 20/50 ring already in place.

Notice there is no engine block in the build. I prefer an engine block so the engine hook won't be able to slide back and forth during boost and ejection. Over time and a few flights, BT-20 tubes can weaken allowing the engine hook to come loose. I'll add an engine block later.




TIP: To make an easier slip of the rear centering ring into the BT-55 tube, round off the inside edge of the rear centering ring.

The forward offset ring (with no notch) glues flush with the forward end of the short BT-55.

On the left I used my sanding block to press the ring in place, even with the end of the outer tube.
On the right I've already applied CWF to the joint and sanded it smooth.