Control requirements & use
Primary controls
Elevator, rudder, ailerons, throttle
Pilots controls
Other methods of pitch, roll & yaw control
Controls problems
Mechanical control systems
Fly-by-wire & Fly-by-light
Control Requirements
An aircraft must be c
Static directional stability
Static directional stability is a measure of
the aircraft's resistance to slipping. The greater
the static directional stability the quicker the
aircraft will turn into a relative wind which is
not aligned with the longitudina
T (h,V , ) = D(h,V ,W )
Four variables but one equation.
For turbojet engine, constant fuel flow rate (fixed throttle setting), altitude and weight
T (V ) = D(V )
Thrust available
T
1
>
W Em
T
1
=
W Em
V2
Low speed solution
V1
121
High speed solution
Velo
Static Stability
We begin with the concept of Equilibrium (Trim).
Equilibrium is a state of an object when it is at rest or in steady uniform motion,
(i.e., with constant linear and angular momenta).
The resultant of all forces and moment about the CG mu
acarh@itu.edu.tr
http:/web.itu.edu.tr/~acarh
3
4
Zero-lift drag coefficient
Lift-dependent drag factor
Maximum aerodynamic efficiency
Maximum lift coefficient
Wing planform area
Aerodynamics
Total weight of aircraft
Maximum weight of fuel
Maximum load fac
Sample Questions-1
The aircraft specifications are: span of the wing,15 m weight, 88000 N, reference
area 37.5 m2, Oswald constant, 0.9, parasite drag coefficient, 0.022.
If the cruise velocity of the aircraft is 200 knots at sea level altitude, find the
UCK441E
ASSIST. PROF. HAYR ACAR
acarh@itu.edu.tr
http:/www3.itu.edu.tr/~acarh
TEXTBOOK:
B. Etkin,
Dynamics of Flight: Stability and Control, 3rd ed.,
John Wiley and Sons, 2001.
OTHER REFERENCES:
J. Blakelock,
Automatic Control of Aircraft and Missiles, 2n
A simple basic control system as
operated by a pilot
Longitudinal Control
through pilots change of thrust (propulsion), and/or
through change of configurations using aerodynamic control surfaces
Main aerodynamic surfaces for longitudinal control:
on Tail
Yeditepe University Seminar
November 8, 2006 | stanbul, TURKEY
Controls and Mechatronics
Research at MEKAR-T
Prof.Dr. Levent GVEN
Yeditepe University Seminar
November 9 2006 | stanbul, TURKEY
Brief Presentation Outline
MEKAR Labs at stanbul Technical Univ