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  1. Brian-Tampa

    MAC Black Fly

    Hello, I was thinking of purchasing a 4" Black Fly kit from MAC Performance. Their site does not have the correct RockSim file for this rocket in the 4" version. (.rkt file format) They do have the file for the 3" version which I downloaded and loaded into RockSim. The file is showing .33 margin...
  2. Interstellar

    Tips and Guidelines for Aerodynamic Stability?

    I've been designing a simple one stage rocket with OpenRocket, which allows the user to design and simulate their designs. I was always told that a general rule of thumb for a rockets stability is that the center of gravity should be 1-2 calibers above the center of pressure. With this rule...
    • Interstellar
    • Thread
    • aerodynamics cad caliber center of gravity center of pressure design help openrocket stability tips
    • Replies: 13
    • Forum: Scratch Built
  3. S

    Center of Pressure in Open Rocket

    I have been trying to calculate the Center of Pressure of a model rocket with and without fins using open rocket. However, whenever I take away the fins the center of pressure seems way too low. I calculated the CP to be 9.22 inches by hand (by using the areas and distances of a 2D cross...
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