gary7
Well-Known Member
After an exhaustive search on line, including this forum, I am unable to find any formulas for calculating shock cord sizes, lengths, etc.
What I have found are opinions about cord lengths. A "general rule of thumb" stating 3-5 x the total rocket length is followed by many of you because "it works for me" or "this is the way I have always done it" but you cannot say otherwise why. I would like to see something proving why a cord should be a certain material, size, length. Some sort of physics/engineering tests would be helpful. We use such data for calculating shear pins and ejection charges for instance but again, I cannot find any such data for shock cord lengths.
Opinions are fine. But I want concrete evidence as to why, not just someone's opinion "just because".
Does anyone have any such study or evidence to share with the rest of us?
What I have found are opinions about cord lengths. A "general rule of thumb" stating 3-5 x the total rocket length is followed by many of you because "it works for me" or "this is the way I have always done it" but you cannot say otherwise why. I would like to see something proving why a cord should be a certain material, size, length. Some sort of physics/engineering tests would be helpful. We use such data for calculating shear pins and ejection charges for instance but again, I cannot find any such data for shock cord lengths.
Opinions are fine. But I want concrete evidence as to why, not just someone's opinion "just because".
Does anyone have any such study or evidence to share with the rest of us?
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