A spill hole helps your model rocket descend more gently by reducing oscillation, or rocking back and forth. It also helps your rocket drift less in the wind, so you don't have to walk as far to recover your rocket. You're less likely to get it stuck in a tree or lose it over the horizon. And cutting a spill hole is easy - check this out!
Wanna see the whole video on attaching and folding parachutes to guarantee perfect recovery? Check out the related video link.
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