By Cecil Colwin
''In leap forward Swimming, swimming trainer and historian Cecil Colwin describes how aggressive swimmers of the trendy period - similar to swimming giants Ian Thorpe and furnish Hackett - observe leading edge education equipment and stroke suggestions to set new criteria of functionality. All 4 strokes in addition to starts off and turns are offered in thorough aspect in Colwin's easy-to-grasp tutorial style.''--BOOK JACKET.
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Extra resources for Breakthrough swimming
Almost any elementary text on fluid dynamics will include within its first one or two pages a statement such as the following typical extract on the basic interaction between lift and drag forces: The force acting on a body moving through a fluid is usually resolved into two components: one called lift normal to the direction in the body, and the other called drag, in a direction opposed to that of motion (Karamcheti 1966). 7 moving through a fluid, human swimming propulsion results from neither lift nor drag forces acting in isolation but rather from a constant interaction between the two during the changing sequences of a swimming stroke (1974; 1977; 1979).
Steedman then describes the action of the dog paddle, a stroke still in use today for teaching beginners. It is possible that the term crawl stroke may have long been in common use to describe the dog paddle and that George Farmer’s use of the term crawling in reference to Wickham’s spectacular method of swimming might have inferred that Wickham was crawling, or dog paddling, so fast that his arms were actually coming out of the water, instead of reaching forward underwater as in the conventional dog paddle action.
51. Adapted by permission. Breakthroughs in Stroke Techniques 37 Drag Coefficient Resultant Propulsive Force Similarly, the term drag coefficient refers to the relationship between the drag component on an airfoil or hand and its angle of attack. The drag coefficient also increases or decreases in relation to the size of the angle of attack. Schleihauf’s measurements show that the drag coefficient on a swimmer’s hand increases as the angle of attack increases to 90 degrees (Schleihauf 1977). With a diminishing angle of attack, the drag coefficient decreases.