What is the definition of coefficient of drag (Cd)?
• A dimensionless number that represents the effect of gravity and Mach number of the rocket. • A dimensionless number representing the rocket configuration, Mach number and angle of attack. • A dimensionless number that represents the friction of the launcher and launch velocity. • What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound? • The Cd decreases. • The Cd stays the same. • The Cd increases. • For a subsonic rocket, what major factors affect the coefficient of drag (Cd)? • Motor thrust, body diameter, nosecone shape and fin shape. • Speed, airframe dimensions, nosecone shape and fin shape. • Gravity, airframe dimensions, nosecone shape and fin shape. • What effect does a boat tail have on a subsonic rocket’s coefficient of drag (Cd)? • No effect, a boat tail is only a cosmetic design feature. • It increases the Cd by changing the airflow over the fins. • It decreases the Cd by reducing the base drag. • The flight of a high power rocket can be
