PRINT THIS ANSWER SHEET TO FILL OUT AND TURN IN.

NAME_________________________________ CLASS____________________ DATE____________ 

Investigating Velocity Effects at Takeoff Worksheet

I. For each of the tables below:

  1. Determine the square of each velocity.
  2. Enter the data in the table.
  3. Start the FoilSim program.

    a) Set the following conditions:

    Airspeed = 100 mph
    Altitude = 0 feet
    Angle = 0 degrees
    Thickness = 12.5%
    Camber = 0
    Area = 1.0 sq ft

    b) Assume and enter the following for each aircraft:

    Altitude = 0 feet
    Angle = 0 degrees
    Thickness = 12.5%
    Camber = 5%

    c) Enter the areas you determined for each aircraft (both wings) from the Wing Area Investigations Activity.
    {Hint: Lift and Area are directly proportional. If the area is over 1000 sq. ft., then divide it by 10 and enter that number. When you get the lift, multiply it by 10 to get the real value!}

  4. Record the lift generated by each entry in your table.
  5. Keeping in mind that the Lift is directly proportional to the square of the Velocity, calculate and record the Constant for each entry in each table.
    Wright Brothers
    Area of two wings:

     

    Velocity:
    Velocity Squared:
    Lift:
    Constant:
    0

     

     

     

    25

     

     

     

    50

     

     

     

    75

     

     

     

    100

     

     

     

    125

     

     

     

    150

     

     

     

    175

     

     

     

    200

     

     

     

    225

     

     

     

    250

     

     

     

    F-18
    Area of two
    wings:

     

    Velocity:
    Velocity Squared:
    Lift:
    Constant:
    0

     

     

     

    25

     

     

     

    50

     

     

     

    75

     

     

     

    100

     

     

     

    125

     

     

     

    150

     

     

     

    175

     

     

     

    200

     

     

     

    225

     

     

     

    250

     

     

     

    (Your Aircraft)
    Area of two
    wings:

     

    Velocity:
    Velocity Squared:
    Lift:
    Constant:
    0

     

     

     

    25

     

     

     

    50

     

     

     

    75

     

     

     

    100

     

     

     

    125

     

     

     

    150

     

     

     

    175

     

     

     

    200

     

     

     

    225

     

     

     

    250

     

     

     

  6. Are the constants exactly the same for all entries in each individual table? Why or why not? List possible sources of error.
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________

     

  7. Are the constant values the same for each aircraft? Discuss and list some reasons for this.
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________

     

II. Review the values entered in FoilSim.

  1. Which values were kept the same for all aircraft in this activity?
    ____________________________________________________
    ____________________________________________________

     

  2. Which values differed from aircraft to aircraft in this activity?
    ____________________________________________________
    ____________________________________________________

     

  3. The "Constant" values you calculated come from the values that are held constant (not changed). Which values do you think are included in the "Constant" value for each aircraft?
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________

     

  4. Could these values ever be considered variables? If so, when and how? If not, why not?
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________

     

  5. Suppose your aircraft is loaded with cargo and extra fuel for a long flight so that it weighs 12500 pounds before takeoff. What airspeed is needed to produce enough lift to get your aircraft airborne? {Hint: On the ground the altitude and angle are both zero. Also, use the same camber and thickness as before since it's the same plane.}
    ____________________________________________________