
Mass
& Velocity Effects Problems
If so instructed by your teacher, print out a worksheet page for these
problems.
Open
FoilSim. Use
the program to answer the following questions.
 Design an airfoil
(wing) that can supply at least 5,000 lbs. of lift at an altitude of
10,000 ft. with a minimum airspeed of 210 mph.
Airfoil Data:
Airspeed

Altitude

Angle

Thickness

Camber

Area

Lift

210
mph

10,000
ft.






 Record the data
from Problem 1 into Table 1. Alter or vary the value of the air density
(change air density by altering ALTITUDE) while keeping the other variables
the same. Record the changes in the lift in Table 1 for five different
air densities in Rows 1  5.
In the lift equation,
lift is L, air density is r, and air speed is v.

Lift

Air
Density

Airspeed

Constant

1





2





3





4





5





6





7





8





9





10





11





12





13





14





15





 Vary the airspeed
and record the changes in lift in Rows 6  10.
 Vary the airfoil
area and record the changes in lift in Rows 11  15.
 Use the equation
L = constant x r x v^{2} to solve for the constant in Table
1.
 Using graph paper,
plot lift versus air density.
 Did you expect
this type of graph?
 If the graph is
linear, calculate the slope of the line.
 Using graph paper,
plot lift versus velocity.
 Did you expect
this type of graph?
 If the graph is
linear, calculate the slope of the line.
 Using graph paper,
plot lift versus constant.
 What can you determine
from this graph?
