What does fineness ratio mean?

Definitions for fineness ratio
fine·ness ra·tio

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  1. Fineness ratio

    Fineness ratio is a term used in naval architecture and aerospace engineering to describe the overall shape of a streamlined body. Specifically, it is the ratio of the length of a body to its maximum width; shapes that are "short and fat" have a low fineness ratio, those that are "long and skinny" have high fineness ratios. Aircraft that spend time at supersonic speeds generally have high fineness ratios, a canonical example being Concorde. At speeds below critical mach, one of the primary forms of drag is skin friction. As the name implies, this is drag caused by the interaction of the airflow with the aircraft's skin. To minimize this drag, the aircraft should be designed to minimize the exposed skin area, or "wetted surface", which generally implies the fuselage should be somewhat "egg shaped", with a fineness ratio about 4.5. A good example of such a design is the Questair Venture. Most aircraft have fineness ratios significantly greater than this, however. This is often due to the competing need to place the tail control surfaces at the end of a longer moment arm to increase their effectiveness. Reducing the length of the fuselage would require larger controls, which would offset the drag savings from using the ideal fineness ratio. An example of a high-performance design with an imperfect fineness ratio is the Lancair. In other cases the designer is forced to use a non-ideal design due to outside factors such as seating arrangements or cargo pallet sizes. Modern airliners often have fineness ratios much higher than ideal, a side effect of their cylindrical cross-section which is selected for strength, as well as providing a single width to simplify seating layout.

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  1. Chaldean Numerology

    The numerical value of fineness ratio in Chaldean Numerology is: 5

  2. Pythagorean Numerology

    The numerical value of fineness ratio in Pythagorean Numerology is: 1

Images & Illustrations of fineness ratio

  1. fineness ratiofineness ratiofineness ratiofineness ratiofineness ratio

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    causing disapproval or protest
    • A. occasional
    • B. transparent
    • C. witless
    • D. obnoxious

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