On this screen, you also specify the engine to be used during your flight, and the weight of the recovery system. You can select from three parachute sizes, which will affect the terminal velocity of your descent . The drag coefficient is based on the cross sectional area of the rocket and has a default value of .7. You can enter a different value for your own rocket design. During Rocket Launch you are able to set the angle of the launch rail, and to set the wind speed.
Positive velocity is from the right of the graphic.
You can return to the design mode by pushing the blue button, or you can launch your rocket by pushing the red button. At that time you can again change launch angle and wind speed. The Learning Technologies Project will continue to improve and update RocketModeler based on user input.