Drag Force

By taking the limit as ß →∞ in Equations (17)-(21) the drag force on thin disks and needles may be obtained. These are:

Thin Disks of Radius a

For motions perpendicular to the plane of the disk as shown in figure (8a)

(22)

For motions along the plane of the disk as shown in Figure 8b

(23)

Ellipsoidal Needle of Length 2b

For motions along the needle as shown in figure (9a)

(24)

For sideway motions of the needle as shown in Figure 9b

(25)