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MATHEMATICS FOR AIR CREW TRAINEES 31 [[image - map of the area around Albany, N.Y.]] FIGURE 25. (7) The model of the German bomber Heinkel (He-177) has a wing span of 17 1/6 inches. What must be its actual wing span? (8) The airplane models described in paragraph 29b will be used for training gunners in range determination. How far from the model should a gunner be so that it will appear to him as though the actual airplane were 600 yards away? Solution: His distance from the model should be in the same ratio to 600 yards as the model scale, or as 1 to 72: 51