Eggtimer Rocketry Flight Computer Manuel d'utilisateur télécharger pdf (Page 38)

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For example, a small 5” payload bay 1.5” inches in diameter (inside of a BT-60 coupler…)

1) Length of Payload Bay in inches: 5

2) Diameter of body tube: 1.5

3) Square of #2 2.25

4) Multiply #1 and #3 11.25

5) Divide by 1500 .0075

6) Take the square root: .0866

We’ll multiply this by 32 to get the size of the drill in 1/32nds, it’s 2.77/32” so we should be fine

with a 3/32 drill bit. Make sure that you use a good sharp drill bit, you do not want any burrs on

the outside of the tube disturbing the airflow. You may want to sand the area around the holes

with some #400 extra-fine sandpaper to smooth out any burrs or flash, and possibly harden it

slightly with some thin CA glue too.

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Eggtimer Rocketry Flight Computer Manuel d'utilisateur Page 38