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  2. Variable-pitch propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Variable-pitch_propeller...

    A controllable-pitch propeller is one where the pitch is controlled manually by the pilot. Alternatively, a constant-speed propeller is one where the pilot sets the desired engine speed ( RPM ), and the blade pitch is controlled automatically without the pilot's intervention so that the rotational speed remains constant.

  3. List of set classes - Wikipedia

    en.wikipedia.org/wiki/List_of_set_classes

    This is a list of set classes, by Forte number. [1] In music theory, a set class (an abbreviation of pitch-class-set class) is an ascending collection of pitch classes, transposed to begin at zero. For a list of ordered collections, see this list of tone rows and series. Sets are listed with links to their complements.

  4. Musical tuning - Wikipedia

    en.wikipedia.org/wiki/Musical_tuning

    Tuning is the process of adjusting the pitch of one or many tones from musical instruments to establish typical intervals between these tones. Tuning is usually based on a fixed reference, such as A = 440 Hz. The term "out of tune" refers to a pitch/tone that is either too high or too low in relation to a given reference pitch. While an ...

  5. Pitch class - Wikipedia

    en.wikipedia.org/wiki/Pitch_class

    A pitch class is a set of all pitches that share the same chroma, just like "the set of all white things" is the collection of all white objects. [ 4 ] In standard Western equal temperament , distinct spellings can refer to the same sounding object: B ♯ 3 , C 4 , and D 4 all refer to the same pitch, hence share the same chroma, and therefore ...

  6. Set theory (music) - Wikipedia

    en.wikipedia.org/wiki/Set_theory_(music)

    The complement of set X is the set consisting of all the pitch classes not contained in X. [12] The product of two pitch classes is the product of their pitch-class numbers modulo 12. Since complementation and multiplication are not isometries of pitch-class space, they do not necessarily preserve the musical character of the objects they ...

  7. Propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Propeller_(aeronautics)

    Early pitch control settings were pilot operated, either with a small number of preset positions or continuously variable. [1] The simplest mechanism is the ground-adjustable propeller, which may be adjusted on the ground, but is effectively a fixed-pitch prop once airborne. The spring-loaded "two-speed" VP prop is set to fine for takeoff, and ...

  8. The Best Laundry Detergent Sheets, Tested and Reviewed - AOL

    www.aol.com/best-laundry-detergent-sheets-tested...

    Power Sheets (50 Count) Arm & Hammer has made a name for itself over the years as the leading authority on cracking tough stains and bad odors — and the brand's laundry detergent sheets are no ...

  9. CubCrafters CC19 XCub - Wikipedia

    en.wikipedia.org/wiki/CubCrafters_CC19_XCub

    In another June 2016 flight review of the CC19-180, Paul Bertorelli of AVweb said, "The XCub has aluminum rather than steel or the Cub’s traditional bungee gear. This was a revelation for me because aluminum does a nice job of absorbing surplus touchdown energy; it’s far less energetic than steel or those blasted bungees in returning ...