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Water Rocket Computer Simulations

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					                        Water Rocket Computer
                             Simulations
PURPOSE:       To determine how Newton’s Laws affect the motion of a rocket.

MATERIALS: flight simulation software.

Flight Simulation: Always Use High Accuracy Calculations for All simulations
The water rockets we launch will probably never reach the same height as the actual rockets simulating
in the software. This is because factors like rocket stability are not figured into the flight simulation.
The software only factors in the ideal, stable, rocket flight.

       1. Define drag:
       2. What design flaws on the rocket can account for an increase in the value for the coefficient of
          drag (cd)?
       3. How can air density affect drag?
       4. Where would the air density contribute the least to drag?
       5. Do the following simulation and fill in the missing data:
             Drag coefficient      Maximum Altitude            Maximum Velocity
             Very High
             High
             Medium
             Low
             Zero(0)

       6. What effect does the increasing the “drag coefficient” have on the maximum altitude the
          rocket travels?
       7. What does psi stand for? What does it measure?
       8. How can the pressure in the bottle affect lift?
       9. Do the following simulation and fill in the missing data:
           Psi     Time       Max Height          Max Velocity           Max Thrust
           25
           50

       10. What is the effect on a rocket’s height if the pressure in the rocket is increased?
       11. Do the following simulation and fill in the missing data:
            Density           Impulse               Max Height            Max Velocity
            alcohol
            Water
            Mercury

       12. What effect on the total impulse does increasing the density of the fluid in the rocket have?
       13. Which fluid gives the optimal height and velocity?
14. To simulate our water rockets, do the following simulation: on the Earth, at Sea Level, high
    drag coefficient, 50 psi, 2L bottle.
       a. Adjust the amount of water to maximize the rockets altitude._________%
       b. Then adjust the water amount to maximize the rocket’s velocity. __________%
       c. Are the two amount the same?
       d. Using a 2 L bottle calculate the optimal volume of water using 50psi. ________L =
            ________ml
15. Is this the optimum fluid volume percentage for all variables?
16. Using the information from 14 and the optimal water percentage, add in the weight of the
    egg, nose cone, and parachute. You must do the flight simulation and then graph the height
    vs. time for the up and down flight for each change of mass.
    Do the following simulation and fill in the missing data:
     Mass (kg)       Time to Apogee          Max Height        Flight time
     0.20
     0.25
     0.30
     0.35

17. Sketch the shape of the optimal graph, explain why the slopes up and down are not the same.




18. Using the information from 16 and the optimal mass, change the area of the parachute. You
    must do the flight simulation and then graph the height vs. time for the up and down flight
    for each change of area.
    Do the following simulation and fill in the missing data:
     Area (m2)          Time to Apogee       Max Height         Flight time
     2.0
     2.5
     3.0

19. Using the optimal area, determine the radius of a circle parachute of the length of a square
    parachute.
Circle (A= r2): radius =_________m =__________cm             diameter=_________cm
Square (A = L2): Length=__________m =__________cm
20. With your optimal results from question 18, record your ideal information below:
       a.   Time to Apogee__________
       b. Maximum Height__________
       c. Maximum Velocity_________
       d. Flight Time____________

				
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posted:6/18/2011
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Jun Wang Jun Wang Dr
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