Viewing page 69 of 91



[[image - diagram shows how to determine heading in a right drift]]

(2) True course=135°, left drift=9°. True heading=144° Answer.

(3) True course=270°, left drift=11°.

(4)True course=315°, right drift=10°. True heading=305° Answer.

(5) True course=0°, left drift=15°.

Section VII


Purpose ---------------------------------------- 41
Scalars and vectors ---------------------------- 42
Addition of vectors ---------------------------- 43
Triangle of velocity --------------------------- 44
Type I ----------------------------------------- 45
Type II ---------------------------------------- 46
Type III --------------------------------------- 47
Summary ---------------------------------------- 48
Miscellaneous exercises ------------------------ 49

41. Purpose.-The purpose of this section is to give the student airman an idea of what a vector is and of how vectors are used in triangle of velocity problems.

42. Scalars and vectors.-a. A scalar is a quantity which has magnitude only. Such quantities can be completely specified by number or letter. Whenever one number completely specifies a quantity, that quantity is a scalar: distance, time, and speed are scalars, as in 6 feet, 30°, 40 mph, or y miles.

b. A vector is a quantity which has direction as well as magnitude. Thus two numbers must be given to determine a vector, one for magnitude and one for direction. An automobile traveling north at 10 feet/second needs a direction as well as a magnitude to describe its motion, so its velocity (speed and direction) is a vector quantity.

Please note that the language and terminology used in this collection reflects the context and culture of the time of its creation, and may include culturally sensitive information. As an historical document, its contents may be at odds with contemporary views and terminology. The information within this collection does not reflect the views of the Smithsonian Institution, but is available in its original form to facilitate research. For questions or comments regarding sensitive content, access, and use related to this collection, please contact