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What does the term "zipper" mean?

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Rocketmaniac

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Originally posted by marshall1031
Can anyone tell me what the term "zipper" means?
Zipper is when the shock cord rips through the body tube....... thus the body tube looks like someones has pulled a zipper down on say a jacket..........

A zipper is general caused by a improper delay charge used..... meaning the delay was too short or too long and the parachute is ejected while the rocket was going to fast.........
 
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