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Beginner's
Guide to Propulsion
Turbine Engine Parts  Inlets
Answers
Note:
Answers may vary slightly depending on the decimal approximation used
for pi.
 A Boeing 747
aircraft has a PW4000 engine with a 94 inch inlet diameter. Find the
radius, circumference, and area of this inlet.
radius = 47 inches

circumference = 295.3 inches

area = 6939.8 square inches

 A DC10 has a
JT9D engine with a 46.7 inch inlet radius. Find the diameter, circumference,
and area of this inlet.
diameter = 93.4 inches

circumference = 293.276 inches

area = 6851.5 square inches

 A Boeing MD90
has a circular inlet with a circumference of 199.39 inches. What is
the radius of the inlet?
radius = 31.7 inches
 The Airbus 318
has a Pratt & Whitney 6000 engine with a crosssectional circular
inlet area of 2508.5774 square inches. What is the circumference of
this inlet?
circumference = 177.5 inches
 A commercial
Boeing 777 has a large circular inlet with a 112 inch diameter. How
much larger is the area of this inlet than the inlet on the Boeing
747? (Hint: refer to problem 1)
2912.2 sq. in.
 The F16 military
plane has a smaller circular inlet with a 34.8 inch diameter. Calculate
the radius, circumference and area of this inlet.
radius = 17.4 inches

circumference = 109.3 inches

area = 951.1 square inches

 The Boeing C17,
a military transport aircraft has a circular inlet with a circumference
of 246.49 inches. Find the diameter and area of this inlet.
diameter = 78.5 inches

area = 4839.8 square inches

 The F18E Super
Hornet has a turbine engine with a rectangular inlet. It has dimensions
of 2'4" by 3'6." Find the area of a cross section of this inlet in
both square inches and square feet.
area=1176 square inches

area = 8.16 square feet

 Suppose there
was a F19E Super Wasp with a rectangular inlet area of 13.5 square
feet. If the length is 4'6," what is the width?
width = 3 feet
 Write a few sentences
summarizing and explaining what you learned from this activity.
Answers will vary according to age and
ability of students

Related Pages:
Standards
Worksheet
Activity
Propulsion Activity Index
Propulsion Index


