AEM 121
Fall 2012
Homework #8
HW #8 is due Oct. 29th at 5 pm.
1. Neatly sketch a diagram demonstrating that the L/D ratio is equal to the ratio of
distance/altitude (d/h) for a gliding aircraft (this requires a little use of geometry and the
derivation of

AEM 121
Fall 2012
Homework #7
HW #7 is due Oct. 22nd 5 pm (HR 215).
1. A 1 m long spinning cylinder produces 6 N of lift force in a free stream flow of 30 m/s.
Using the Kutta-Joukowski equation, calculate the circulation. Assume SSL conditions for
air. I

AEM 121
Fall 2012
Homework #10
HW #10 is due Nov. 26th by 5 pm (HR 215).
1. The critical Mach number of wing with zero sweep is 0.72. How much wing sweep is
necessary to increase the critical Mach number to 0.90?
2. If an airplane is flying at an altitude

AEM 121
Fall 2012
Homework #3
HW #3 is due Sep. 17th by 5 pm (HR 215).
1. The temperature and pressure at the quarter-chord of a wings upper surface is 14.5 C and
93.2 kPa. What is the density at this location?
2. A total of 425 kg of air is pumped into a

AEM 121
Fall 2012
Homework #6
HW #6 is due Oct. 15th 5 pm (HR 215).
1. Create a XY (scatter) graph plotting the boundary layer growth over a flat plate that is 1.5 m long for
the following flows:
a. laminar air flow at 50.0 m/s
b. turbulent air flow at 50

AEM 121
Fall 2012
Homework #1
HW #1 is due Sept. 5th by 5 pm, Hardaway 215 (Note: Monday 9/3 is a holiday)
Research beyond our required text book and lecture notes may be necessary to answer homework
questions. Use of the library and internet is encourage

AEM 121
Fall 2012
Homework #4
HW #4 is due Sept. 24th by 5 pm (HR 215).
1. The velocity vector is V 30 15 18k m/s. What is the magnitude of the velocity?
i
j
2. Three forces are applied on a particle:
F1 425 302 N
i
j
F2 625 839 N
i
j
F3 542 949 N
i
j
De

AEM 121
Fall 2012
Homework #1
HW #1 is due Sept. 5th by 5 pm, Hardaway 215 (Note: Monday 9/3 is a holiday)
Research beyond our required text book and lecture notes may be necessary to answer homework
questions. Use of the library and internet is encourage

Lecture 18
Structures and Materials
Refs:
Wegener, -
Anderson, Chp 10
Courses:
AEM 250/251, AEM 341, AEM 451, AEM 461, AEM 452
Announcements:
Group project teams finalized by 5 today
No HW this week, Friday in recitation I will work through a Tornado Ex

Lecture 9
Conservation Equations
Refs:
Wegener, 5.2
Anderson, 4.1 4.3, 4.7
Courses:
AEM 311, AEM 313, AEM 413
Announcements:
HW #4 is posted, due Monday
Sign up sheets for wind tunnel test
AEM 121: Introduction to Aerospace Engineering
In the News
NASA

Lecture 12
Aerodynamic Drag
Refs:
Wegener, 7.1 7.4
Anderson, 4.21, 5.3 5.5, 5.12
Courses:
AEM 313, AEM 413
Announcements:
HW #6 due Monday.
AEM 131: Introduction to Aerospace Engineering
In the News
Former AE grad pursuing PhD at MIT
http:/www.youtube.com

Aerodynamics Introduction, Part II
AE 1350
So far
Continuity and conservation of Momentum gave us:
AV = Const
1
V 2 + p = Const
2
For compressible flow, we need another equation to
allow us to solve for what happens to density
AV = Const
VdV + dp = 0
Co

Some Airplane Basics
AE 1350
How Airplanes Fly
The (too) simple version:
1) Air must go faster over the top of wing (why?)
2) Bernoullis principle implies that pressure will be lower on
upper surface
Pressure + * Density * Velocity2 = Constant (Static

Aerodynamics Introduction
AE 1350
Aerodynamics
The flow of air over a shape is the fundamental source of the
sustaining force (lift) that allows airplanes to fly
It also results in drag, and moments (causes rotation)
The science that deals with these f

Final Thoughts
AE 1350
History
How Airplanes Fly
1.
2.
3.
4.
5.
Lift generated to oppose Weight
Thrust generated to oppose Drag
Structure is strong/stiff enough
Can be trimmed, i.e. balanced
Either stable OR controllable
Disciplines
Structures
Propulsion

Reviewing What We Covered In Problem 1
How Airplanes Fly
1.
2.
3.
4.
5.
6.
It flies in the atmosphere
Lift generated to oppose Weight
Thrust generated to oppose Drag
Total aircraft performance results
Structure is strong/stiff enough
Stability and control

I. AIRCRAFT
a. Aircraft operations/emergency checklist
b. Aircraft Certificates (Airworthiness, Registration & Radio Station License)
c. Special Airworthiness Certificate (ferry permit) for flying over gross with ferry fuel tank installation.
d. Aircraft

Fundamental Flow Properties
and
The Standard Atmosphere
AE 1350
Fundamentals
Flow of air over the surface of a vehicle is the fundamental
source of the sustaining force (lift) that allows a heavierthan-air vehicle to fly.
The science that deals with the

The Last and First Words
If youre a regular viewer of Solar Impulse TV (SI-TV), youve most certainly seen the tall grey-haired and fairy-fingered man gently
and patiently handling the cockpit at every take-off and landing. Hes a member of the ground crew

TRANS-OCEANIC FERRY FLIGHT
EQUIPMENT CHECKLIST
(*Current as of May 20, 2005)
Many of the items here can be found in the storage closet in the Flight Ops building or obtained from
the parts department in the hangar.
Items in BOLD PRINT are required per the