SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cap-rocket-stability-cp-cg

For a stable model rocket, where should the center of pressure be compared to the center of gravity?

Toward the tail, below the center of gravity.

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  1. At exactly the same point
  2. Toward the nose, above it
  3. Toward the tail, below the center of gravity ✔

Why: Fins push the center of pressure toward the tail. With the center of gravity forward of it, the rocket keeps its nose pointed into the wind like an arrow.

Huh, didn't know that: NASA notes that full-scale rockets usually steer and stay stable by pivoting their exhaust nozzles, not with fins.

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References

Answer: Toward the tail, below the center of gravity. Fins push the center of pressure toward the tail. With the center of gravity forward of it, the rocket keeps its nose pointed into the wind like an arrow.

  1. NASA Glenn: Conditions for Rocket Stability www1.grc.nasa.gov/beginners-guide-to-aeronautics/conditions-for-rocket-stability
    For a stable model rocket, the center of pressure must be located below the center of gravity.
    Checked 2026-10-10.
  2. NASA Glenn: Conditions for Rocket Stability www1.grc.nasa.gov/beginners-guide-to-aeronautics/conditions-for-rocket-stability
    Full scale rockets pivot their exhaust nozzles to provide stability and control.
    Checked 2026-10-10.
  3. CAP Model Rocketry Complete Guide www.gocivilairpatrol.com/media/cms/Complete_Guide_F4ED514D80382.pdf
    the balance point can be moved forward, or the fin area can be enlarged
    Checked 2026-10-10.

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