Rail Buttons
In a two rail buttons setup, place the first rail button as far aft as possible.
The second rail button should be slightly ahead of the center of gravity (CG).
1010 buttons for 1.0" rails, and 1515 buttons for 1.5" rails.
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Shock Cords
For single deployment rockets, typically 3x the length of the rocket.
If using a non-elastic cord like kevlar, more length might be suggested.
For dual deployment rockets, typically 3x the length of the rocket for apogee
(lower section) and 2-3x the length of the rocket for the main (upper section).
If using a non-elastic cord like kevlar, more length might be suggested.
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Parachutes
I would suggest reviewing our RESOURCES page for an online calculator.
You will want enough parachute to give no more than 20-25 fps descent rate.
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