Center of Pressure (CP) - The point at which the aerodynamic lift on a rocket is centered.

Center of Gravity (CG) - The point at which a rocket balances when completely prepped for flight.

For your model to be stable, you need the CP to be below (aft) of your CG. Typical rule of thumb is to have the CP "1 caliber" behind the CG (where 1 caliber is the diameter of the main body tube). The further behind the CG you place the CP, the greater the stability. However, an over-stable model has its own problems... An over stable model will be greatly influenced by wind and cross-breezes. An over stable model will have a great tendency to come off the launch pad at a sharp angle if there is a breeze at the launch site, for example.

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