Triangle of Velocities Flashcards
Pilotage Ground Position or Fix
● This is flying to a destination by “hedge-hopping” or “sightseeing”.
● In this case you fly simply from point to point by using towns, roads, and other landmarks.
● At any given instant the point on the surface of the earth that is directly underneath the aircraft.
● It may be obtained by map reading
Dead Reckoning
● This is flying a course by reference to a set of calculations alone (navigation log).
● No navigational aids are used.
● Based on time, distance, and direction only.
● The pilot must know:
➢ the distance from one point to the next,
➢ the magnetic track to be flown, and
➢ have some idea of the effects of the winds that are expected to be encountered during the flight
Course = what’s on the map.
Track = what you are actually following.
Wind Triangle
● The wind triangle is a graphical representation of the relationship between the aircraft motion and wind.
● It is used extensively in dead reckoning navigation.
● The air vector represents the motion of the aircraft through the air mass.
➢ Described by true airspeed and true heading.
● The wind vector represents the motion of the air mass over the ground.
● It is described by wind speed and the wind direction.
➢ Note: That by convention wind direction is given as the direction the wind is from.
➢ In a vector diagram such as the wind triangle, wind direction is often stated or drawn as the direction the wind is blowing to, or 180° different from the convention
● The ground vector represents the motion of the aircraft over the ground.
➢ Described by track and ground speed.
● The ground vector is the resultant of algebraically adding the air vector and the wind vector
Remember, the three sides of a wind triangle are represented by these vectors:
True Track (Course) and Ground Speed
Wind Direction and Wind Speed
True Heading and True Airspeed
Solving with cx2
● Given:
➢ True course 030°
➢ True airspeed 170 KT
➢ Wind 080° 20 KT
● Determine:
➢ True Heading and Ground Speed
35 degrees
156kts
