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  2. Raptor-class patrol boat - Wikipedia

    en.wikipedia.org/wiki/Raptor-class_patrol_boat

    In the base of the ship's hull, the volume of this water conduit is 170 litres (45 US gal). [ 4 ] In 2022 it was reported that the Pella Shipyard had designed a new so-called "2.0" version of the Raptor incorporating Russian engines with a total capacity of 1678 kW as well as two guided missile launchers, laser detection, and a passive jamming ...

  3. CB90-class fast assault craft - Wikipedia

    en.wikipedia.org/wiki/CB90-class_fast_assault_craft

    Stridsbåt 90 H(alv) (Strb 90 H; CB90) is a class of fast military assault craft used by several countries after being originally developed for the Swedish Navy by Dockstavarvet.

  4. Eyepiece - Wikipedia

    en.wikipedia.org/wiki/Eyepiece

    The 4-element orthoscopic eyepiece consists of a plano-convex singlet eye lens and a cemented convex-convex triplet field lens achromatic field lens. This gives the eyepiece a nearly perfect image quality and good eye relief, but a narrow apparent field of view — about 40°–45°. It was invented by Ernst Abbe in 1880. [3]

  5. Triplet lens - Wikipedia

    en.wikipedia.org/wiki/Triplet_lens

    A triplet lens A Steinheil triplet telescope eyepiece. The three lenses may be cemented together, as in the Steinheil triplet (optimized for finite conjugate ratio) or the Hastings triplet (optimized for infinite conjugate ratio). [2] Or a triplet may be designed with three spaced glasses, as in the Cooke triplet. The former has the advantage ...

  6. Canon EF 28-90mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_28-90mm_lens

    The Canon EF 28–90mm f / 4–5.6 is a full frame SLR zoom lens, also often included as a kit lens with Canon EOS film cameras. The maximum aperture is f / 4 at 28mm, reducing to f / 5.6 at 90mm. When set to 90mm, this will create a moderate amount of background blur for portrait photography.

  7. SpaceX Merlin - Wikipedia

    en.wikipedia.org/wiki/SpaceX_Merlin

    Raptor will use liquid methane as a fuel, and was stated as having a sea-level thrust of 6,700 kilonewtons (1,500,000 lbf). [59] Since the initial announcement of Raptor, Musk has updated the specification to approximately 230 tonnes-force (2,300 kN; 510,000 lbf)—about one-third the original published figure—based on the results of ...

  8. Distributed Bragg reflector - Wikipedia

    en.wikipedia.org/wiki/Distributed_Bragg_reflector

    Time-resolved simulation of a pulse reflecting from a Bragg mirror. A distributed Bragg reflector (DBR) is a reflector used in waveguides, such as optical fibers.It is a structure formed from multiple layers of alternating materials with different refractive index, or by periodic variation of some characteristic (such as height) of a dielectric waveguide, resulting in periodic variation in the ...

  9. GLARE - Wikipedia

    en.wikipedia.org/wiki/GLARE

    (Glare1 can only consist of aluminum layers of 0.3 to 0.4 mm (0.012 to 0.016 in; 12 to 16 mils) thickness, though.) For example, Glare4B-4/3-0.4 is a Glare sheet with a Glare4 grade (using the B variant) where there are four aluminum layers and three glass fiber layers, and the thickness of each aluminum layer is 0.4 mm (0.016 in; 16 mils). [26]

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