11. The internal alignment of the shock waves means that Busemann's biplane produces minimum wave drag . 12. Therefore, anything that reduces wave drag will theoretically make it easier for a swimmer to swim faster. 13. It is the sudden and dramatic rise of wave drag that leads to the concept of a sound barrier. 14. Several other attempts to reduce wave drag have been introduced over the years, but have not become common. 15. Alternatively, at Mach numbers increasing towards the speed of sound and beyond, wave drag dominates design concerns. 16. A method of decreasing wave drag was discovered by German researchers in 1935 & mdash; sweeping the wing backwards. 17. In transonic flight, wave drag is commonly referred to as "'transonic compressibility drag " '. 18. A method of decreasing wave drag was discovered by German researchers in World War II : sweeping the wing backward. 19. It had a favourable chordwise distribution of cross-sectional area and hence a low wave drag in supersonic flight. 20. Wave drag is one of the forms of drag created by swimmers, the others being pressure drag and friction drag.
