NAME_________________________________ CLASS____________________ DATE___________________
Drag Equation - Level 1
Worksheet
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A. What possible reference areas (A) can be used to compute the
drag?
B. If we want to compute the L/D (lift to drag ratio), which
reference area would we want to use? Why?
C. Besides reference area, air density and velocity, drag depends
on several other values. What variable is used to model many of
the complex dependencies of drag?What are some of the dependencies
of drag incorporated in this value?
work:
B. The thrust of the aircraft is 120,000 pounds and the
air density is .00048 slugs/cu.ft. The current cruising speed is
450 mph and we need to determine the drag coefficient of the
aircraft. Find the Cd. (Hint: you may want to convert the original
equation first)
convert equation:
work:
Cd = ___________
C. Weather conditions force the aircraft to descend to a level
where the air density is .00076 slugs/cu.ft. The engine thrust
increases to 250,000 pounds. At the new cruising altitude, what is
the speed of the aircraft? (Hint: once again, you may want to
convert the equation first)
convert equation:
work:
speed(V) =__________________