Incoming Level Course

Figure J69. Target courte naineĀ».

Section III. REQUIREMENTS FOR A HIT

160. General a. To engage enemy aircraft effectively, the machinegunner must accurately estimate the future position of the target, and point his gun in such a manner that the flred rounds and the aircraft will arrive at the estimated point at the same time.

b. The problem can be compared to that of a machinegun firing up a hill. Laying the gun in elevation is accomplished by tracking the target. In figure 170, despite the fact that the vehicle is moving along the side of a hill, the machinegunner concerns himself with only a 1-lead angle measured along the slope of the hill. If the vehicle |b replaced by an aircraft, and the hill is replaced by air space {fig 171), it is apparent that the gunner's problem in figure 171 is identical to that in figure 170. (There is a faster speed in the case of the aircraft.) To hit the target, the gunner must fulfill two requirements: line and lead.

161. Line Requirement for a Hit

The line requirement demands that the gunner cause the round to intersect the target course line. The vertical mass of the target affords the gunner a small angular (elevation) tolerance in fulfilling the line requirement The si2e of this angle varies directly with the diameter of the fuselage and inversely with the range to the target.

162. Lead Requirement for a Hit

The lead requirement demands that the gunner cause the round to intersect the target Angular tolerance in fulfilling the lead requirement is provided by the horizontal mass of the target The magnitude of this angle varies directly with the length of the target fuselage and the sine of the angle of approach. It varies inversely with the range to the target.

truck truck

Figure 170. Load angle, moving ground target.

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