S -> Slip stream
T -> Torque
A -> Assymetric Blade
G -> Gyroscopic
W -> Wind
Thursday, April 25, 2013
Sunday, April 21, 2013
WHAT ARE CONTROL INSTRUMENTS, PERFORMANCE INSTRUMENTS AND NAVIGATION INSTRUMENTS?
The Control Instruments display immidiate attitude and power indications and are calibrated to permit those respective adjustments in precise increments. Control is determined by reference to the attitude and power indicators. Power indicators vary with aircraft and may include manifold pressure, tachometer, fuel flow, etc.
The Performance Instruments indicate the aircraft's actual performance. Performance is determined by reference to the altimeter, airspeed, or vertical speed indicator (VSI).
The Navigation Instruments indicate the position of the aircraft in relation to a selected navigation facility or fix. This group of instruments include various types of course indicators, range indicators, glide-slope indicators, and bearing pointers. Newer aircraft with more technologically advanced instrumentation provide blended information, giving the pilot more accurate positional information.
Saturday, April 20, 2013
WHAT IS A WINDMILLING PROPELLER
Windmilling is experienced when the rpm is reduced but the airspeed is maintained, which eventually will cause the blade angle of attack to become negative. When this occurs, the resulting force will act in a rearward direction. This is known as windmilling.
A windmilling propeller causes a drag force, which is opposite yo the direction of flight. This drag can be quite high, and in addition to its deceleration effect, it also can cause a large yawing moment on a multiengined aircraft with asymmetric thrust.
HOW DO PROPELLER AIRCRAFT GENERATE NOISE?
The noise generated by a propeller aircraft is from the sheer effect of different displaced air velocities. That is, the sheer is the difference between the propeller's faster displaced air and the slower ambient air around it.
WHAT IS THERMODYNAMICS?
Thermodynamics is the study of heat/pressure energy or the behavior of gases (including air) and vapors under variations of temperature and pressure.
WHAT ARE ISOBAR AND ISOTHERM?
An isobar is a line on meteorologie chart that joins places of equal sea level pressure.
An isotherm is a line joining places of the same mean temperature.
EXPLAIN WHY AN AIRCRAFT STALLS
An aircraft stalls when the streamlined/laminar airflow (or boundary layer) over the wing's upper surface, which produces lift, breaks away from the surface when the critical angle of attack is exceeded, irrespective of airspeed, and becomes turbulent, causing a loss in lift (i.e., the turbulent air on the upper surface creates a higher air pressure than on the lower surface). The only way to recover is to decrease the angle of attack (i.e., relax the back pressure and/or move the control column forward).
WHAT IS THE PRIMARY USE OF FLAPS ON A JET AIRCRAFT?
The primary use of flaps, especially on a jet aircraft, is to increase lift by extending the geometric chord line of the wing, which increase its chamber and area.
Tuesday, April 9, 2013
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