QUESTION: What is the drag coefficient for the Mars Pathfinder's heat shield and parachute? How many G's will Pathfinder pull during entry? ANSWER from Robert Manning on July 2, 1997: The entry vehicle (at supersonic speeds) has a drag coefficient of about 2. At subsonic velocities when the vehicle under the the drag coefficient of the parachute is about 0.47. During atmospheric entry the peak deceleration may be as high as 20 Earth gees.