Model Rocketry and Siege Engine Glossary Letter K


Model Rocketry and Siege Engine Glossary Letter K

Glossary
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Kaplow Clip
A popular type of motor retainer designed by Bob Kaplow
Kevlar®
Registered trademark of E.I. duPont de Nemours and Company. A type of aramid fiber (a para-aramid nylon).
A synthetic fiber, originally woven into mats for use in bullet-resistant body armor. Kevlar is highly resistant to tearing or burning. Kevlar thread is used in some model rockets as a shock cord.
In model rockets, this provides the advantage of allowing the cord to be anchored to the motor mount rather than to the open end of the airframe. This design is less susceptible to zippering and burning. Larger-diameter Kevlar cord is increasingly being used as shock cords on high-power rockets for the same reason, and because Kevlar is stronger than bungee or elastic straps
Kevlar is also woven into sheaths or bags, and used to protect elastic shock cords and parachutes in larger rockets. See Deployment Bag
Kicker
A liquid, usually of the Freon family, used to accelerate the set time of cyanoacrylate adhesive
Kitbash
The practice of modifying a rocket kit to achieve some result other than that intended by the manufacturer
Kraft Paper
a course paper used in making cylindrical airframes. Kraft paper comes in bias weights of 16 to 90 pounds. Rocket airframes made of Kraft paper are usually built up with several layers, using different weights of paper in the different layers
Krushnic Effect
The effect caused when rocket motor exhaust is confined in an open tube, such as a booster stage airframe. The exhaust gas over-expands and loses its velocity, reducing the motor thrust. Also called over-expansion. Usually occurs when a booster motor separates but the booster stage does not.


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