Dr. Zooch Vanguard Eagle Build Part 37 Engine Bells

The engine bells are glued in place, centered behind the SRBs.

Drilling the centering ring for the rear vent holes took a little bit of work.

I first used a sharp awl to mark the center and to make something for the drill to center itself in.

To start the hole, I used a smaller drill than the recommended 1/8" drill.
The 1/8" drill was used for the final hole size.

I covered the front of the body tube with the palm of my hand and blew into the engine mount tube. My breath did come back out through the engine bells!

Apogee Heli -Roc Build Part 17 Burn Thread Holes

Drill two holes, 1/16" diameter by spinning the tip of your hobby knife on the body tube. The hole center should be 2" up from the leading edge of two fins.

Make the hole rounder by pressing and spinning a toothpick in the hole.

I added a little glue around the hole for strength.