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  2. Piasecki X-49 SpeedHawk - Wikipedia

    en.wikipedia.org/wiki/Piasecki_X-49_SpeedHawk

    The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined experimental high-speed compound helicopter developed by Piasecki Aircraft.The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk, but utilizes Piasecki's proprietary vectored thrust ducted propeller (VTDP) design and includes the addition of lifting wings.

  3. List of X-planes - Wikipedia

    en.wikipedia.org/wiki/List_of_X-planes

    X-15A-2: North American USAF, NASA 1964 Hypersonic, high-altitude flight Major Pete Knight flew the X-15A-2 to a Mach 6.70, making it the fastest piloted flight of the X-plane program. X-16: Bell USAF 1954 High-altitude reconnaissance [26] "X-16" designation used to hide true purpose. [27] Canceled and never flew. X-17: Lockheed USAF, USN 1956

  4. Exponentiation - Wikipedia

    en.wikipedia.org/wiki/Exponentiation

    Graphs of y = b x for various bases b: base 10, base e, base 2, base ⁠ 1 / 2 ⁠. Each curve passes through the point (0, 1) because any nonzero number raised to the power of 0 is 1. At x = 1, the value of y equals the base because any number raised to the power of 1 is the number itself.

  5. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    Two to the power of n, written as 2 n, is the number of values in which the bits in a binary word of length n can be set, where each bit is either of two values. A word, interpreted as representing an integer in a range starting at zero, referred to as an "unsigned integer", can represent values from 0 (000...000 2) to 2 n − 1 (111...111 2) inclusively.

  6. Tetrasomy X - Wikipedia

    en.wikipedia.org/wiki/Tetrasomy_X

    Tetrasomy X, also known as 48,XXXX, is a chromosomal disorder in which a female has four, rather than two, copies of the X chromosome.It is associated with intellectual disability of varying severity, characteristic "coarse" facial features, heart defects, and skeletal anomalies such as increased height, clinodactyly (incurved pinky fingers), and radioulnar synostosis (fusion of the long bones ...

  7. Lottery mathematics - Wikipedia

    en.wikipedia.org/wiki/Lottery_mathematics

    This means that the probability of correctly predicting 2 numbers drawn from 49 in the correct order is calculated as 1 in 49 × 48. On drawing the third number there are only 47 ways of choosing the number; but we could have arrived at this point in any of 49 × 48 ways, so the chances of correctly predicting 3 numbers drawn from 49, again in ...

  8. Martin Marietta X-24 - Wikipedia

    en.wikipedia.org/wiki/Martin_Marietta_X-24

    The X-24 (Model SV-5P) was built by Martin Marietta and flown from Edwards AFB, California. The X-24A was the fourth lifting body design to fly; it followed the NASA M2-F1 in 1964, the Northrop HL-10 in (1966), the Northrop M2-F2 in 1966 and preceded the Northrop M2-F3 (1970). The X-24A was a fat, short teardrop shape with vertical fins for ...

  9. X49 - Wikipedia

    en.wikipedia.org/wiki/X49

    X49 or X-49 may refer to: X49, airport code for South Lakeland Airport; X-49, a fictional robot assassin in the animated series Samurai Jack; Piasecki X-49 SpeedHawk, an experimental compound helicopter