of design and other characteristics render this instru- S=Nh ment of possible use on multi-engined aircraft. where S is the speed of the propeller, N the speed of STROBOSCOPIC TACHOMETER the disk, and h the number of holes in the disk. This instrument consists of two parts, a device for Many forms… … Figure 19—Stroboscopic tachometer. a tachometer. Figure 19 shows a simple form of The stroboscopic tachometer is useful in determining stroboscopic tachometer utilizing a small fan motor. the speed of any revolving object to which it is incon- venient or undesirable to connect mechanically a In…
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