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Velocity Effects Activity


If so instructed by your teacher, print out a worksheet
page for these problems.
To answer the
questions in this activity you will need to launch the application
FoilSim.
Also open the slide called Velocity
Effects (with text) and read the explanation on how velocity affects
lift.
Open FoilSim and set
initial conditions as follows:
Airspeed
(velocity) = 50 km./hr.
Altitude = 5000 m.
Angle = 1 deg.
Thickness = 12.5
Camber = 12.5
Area = 5 sq. m.
 What is the lift?
____________
 Change the velocity
(airspeed) as shown in Table 1 and record the associated lift for each
velocity to complete the table.
Velocity
(km/h)

Lift
(Newtons)

50


100


150


200


250


300


400


Table 1
 Construct a graph
of velocity's effect on lift with an Independent Variable(X) of velocity
and a Dependent Variable(Y) of lift. Label each axis correctly to include
units.
 What is the shape
of the curve formed by this relationship?
 Write the equation
for this relationship.
 What is the value
of the constant in the equation for this set of conditions?
C = _____________________________
 Interpolate the
lift for a velocity of 350 km./hr. What is the lift? _____________
 Extrapolate the
lift for a velocity of 500 km./hr. What is the lift? _____________
 Based on the relationship
between lift and velocity, how would you increase the lift on a wing?
 Set the initial
conditions provided in Problem 1 above and assume: g = 9.8 m./sec.^{2
}at this elevation; total weight of airplane, cargo, and fuel =
5000 kg.; weight of airplane = 3000 kg. ; weight of cargo and fuel =
2000 kg. Use the equation for lift that you generated in Problem 5 to
answer these questions:
 What
is the lift in Newtons required to maintain altitude in these
conditions?
___________________________________________
 What is the
velocity that is required to maintain this lift?
___________________________________________
 One hour later
all cargo is parachuted off the airplane and 200 kg. of fuel remains.
 What
is the lift in Newtons now required to maintain altitude?
___________________________________________
 What is the
velocity that is now required to generate the lift?
___________________________________________

Related Pages:
Standards
Worksheet
Lesson Index
Aerodynamics Index


