Rocketry Works

Braided Kevlar Shock Cord by the foot

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Braided Kevlar shock cord is incredibly strong for its weight and is heat resistant, so it makes a great shock cord in model rockets. Low power rockets can use 100 lb. tensile strength, while mid power rockets will do better with 250 to 750 lb tensile strength.  High power rockets do best with 1500 lb tensile strength. Price is by the foot; just indicate how many feet you need in the quantity field.

A minimum of 6 feet of shock cord is best for small rockets; larger rockets likely need more--up to 20 ft--to ensure proper deployment of the recovery device. Longer shock cords also provide more shock absorbency, though Kevlar cord stretches much less than elastic shock cords.  Many times, this will help reduce damage to body tubes from the nose cone bouncing back and hitting the body tube, but the sharper yank at deployment requires a sturdy shock cord attachments. Can be combined with elastic shock cord to add shock resistance in heavier models. Just put the Kevlar closer to the motor so you benefit from its flame resistance, and add a length of elastic shock cord near the recovery device.

Maximum spool lengths differ by Kevlar weight:

  • 100 lb: 200 ft
  • 150 lb: 100 ft
  • 250 lb: 100 ft
  • 400 lb: 1000 ft
  • 550 lb: 100 ft
  • 750 lb: 100 ft
  • 900 lb: 500ft
  • 1500 lb: 50 ft
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4 Reviews

  • 5
    Braided Kevlar Shock Cord by the foot 1000# and 750#

    Posted by Tim Fritts on 26th Jul 2021

    Rocketry Works product braided kevlar shock cord is the best product I have found when building mid power rocket recovery systems. Super strong, very light weight and very inexpesive for smaller rockets. Tie around your motor mount tube and run it through a drilled hole in the top centering ring and measure twice of three times rocket lenght, tie your favorite loop knot and attack parachute and nose cone. You while find that the need for a rubber shock cord is history. Thanks

  • 4
    kevlar by the foot

    Posted by TODD LESTER on 14th Jan 2021

    Works as expected.

  • 5
    kevlar shock cord

    Posted by PATRICK PAGADUAN on 5th Jan 2021

    Using this as replacement shock cord for my Estes PS II rockets. Have yet to fly, but it appears to be really sturdy for mid-power applications.

  • 5

    Posted by Allen Montgomery on 24th Dec 2020

    This cord works so well I'm using it on all My rockets

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