Apogee Heli-Roc Build Part 4 Ports

On my BT-5 tube, the fin marking guide was a little to wide. It over wrapped by about 1/32".

I knew the fin marks and ports (or slots) would be critical, so I made a new marking guide.

After the three fin marks were made, I centered the ports over the three lines.

I only cut one box out and rotated the same "master" around the tube to draw three consistent rectangles.

Here I used the top of the wrap to check the top and bottom of the ports to be sure all lines were level with each other.