The 15 indicates that the airfoil has a 15 % thickness to chord length ratio : it is 15 % as thick as it is long.
12.
The sagitta also has uses in physics where it is used, along with chord length, to calculate the radius of curvature of an accelerated particle.
13.
When the arc reaches 60? the chord length is exactly equal to the number of degrees in the arc, i . e . chord 60?= 60.
14.
X is the location where induced velocity is produced, x'is the location of the vortex element producing the velocity and c is the chord length of the airfoil.
15.
The point on the leading edge that is used to define the chord can be defined as either the surface point of minimum radius, or the surface point that will yield maximum chord length.
16.
Where C _ { D } is the drag coefficient of the aerofoil, and c is the chord length . { C _ { D } }'is apparently the point drag coefficient.
17.
If the chord definition is used each 100-unit chord length will sweep 1 degree with a radius of 5729.651 units, and the chord of the whole curve will be slightly shorter than 600 units.
18.
:: If you are actually looking for the chord length ( sorry about my absent-mindedness ), then the cos ? that goes into ( T ) 18 : 23, 27 October 2009 ( UTC)
19.
Trigonometry, in the form of a table of chord lengths in a circle, was probably used by Claudius Ptolemy of Alexandria to obtain the value of given in the " Almagest " ( circa 150 CE ).
20.
The chord function can be related to the modern sine function, by taking one of the points to be ( 1, 0 ), and the other point to be ( ), and then using the Pythagorean theorem to calculate the chord length:
