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  2. Backup battery - Wikipedia

    en.wikipedia.org/wiki/Backup_battery

    A valve-regulated lead-acid battery is a battery type that is popular in telecommunications network environments as a reliable backup power source. VRLA batteries are used in the outside plant at locations such as Controlled Environmental Vaults (CEVs), Electronic Equipment Enclosures (EEEs), and huts, and in uncontrolled structures such as ...

  3. ADI Bumble Bee - Wikipedia

    en.wikipedia.org/wiki/ADI_Bumble_Bee

    Data from Bumble Bee Performance and Stress Analysis General characteristics Crew: 1 Length: 10 ft (3.0 m) Height: 7 ft 6 in (2.29 m) Empty weight: 213 lb (97 kg) Gross weight: 500 lb (227 kg) Powerplant: 1 × Rotax 447 2-cylinder air-cooled 2-stroke in-line piston engine, 40 hp (30 kW) Main rotor diameter: 23 ft (7.0 m) Propellers: 2-bladed fixed-pitch propeller Performance Maximum speed: 49 ...

  4. Mechanically powered flashlight - Wikipedia

    en.wikipedia.org/wiki/Mechanically_powered...

    Shaking the unit for 10 to 15 seconds every 2 or 3 minutes as necessary permits the device to be used continuously. It is often viewed as a toy, or an emergency backup for other flashlights. [3] Fraudulent counterfeit versions of these flashlights have been sold, most of which incorporate hidden coin-sized non-rechargeable lithium batteries ...

  5. Air & Space 18A - Wikipedia

    en.wikipedia.org/wiki/Air_&_Space_18A

    The Air & Space 18A is a gyroplane that was manufactured in the central United States between 1965 and 2000.. The Air & Space 18A is one of the last three gyroplanes issued a Standard Airworthiness Certificate (September 1961) by the United States Federal Aviation Administration (FAA).

  6. Gyro-Kopp-Ters Midnight Hawk - Wikipedia

    en.wikipedia.org/wiki/Gyro-Kopp-Ters_Midnight_Hawk

    The Midnight Hawk features a single main rotor, a single-seat open cockpit with a windshield, tricycle landing gear with wheel pants and a four-cylinder, air-cooled, four-stroke, 90 hp (67 kW) Subaru EA-82 automotive conversion engine in pusher configuration.

  7. Gyro-Kopp-Ters Twin Eagle - Wikipedia

    en.wikipedia.org/wiki/Gyro-Kopp-Ters_Twin_Eagle

    The Twin Eagle features a single main rotor, a two-seats-in tandem open cockpit with a windshield, tricycle landing gear with wheel pants and a four-cylinder, air-cooled, four-stroke, 120 hp (89 kW) Subaru EJ-22 automotive conversion engine in pusher configuration.

  8. Flash (photography) - Wikipedia

    en.wikipedia.org/wiki/Flash_(photography)

    A full-power flash from a modern built-in or hot shoe mounted electronic flash has a typical duration of about 1ms, or a little less, so the minimum possible exposure time for even exposure across the sensor with a full-power flash is about 2.4 ms + 1.0 ms = 3.4 ms, corresponding to a shutter speed of about 1 ⁄ 290 s. However some time is ...

  9. Fairey Rotodyne - Wikipedia

    en.wikipedia.org/wiki/Fairey_Rotodyne

    The Fairey Rotodyne was a 1950s British compound gyroplane designed and built by Fairey Aviation and intended for commercial and military uses. [1] A development of the earlier Fairey Jet Gyrodyne, which had established a world helicopter speed record, the Rotodyne featured a tip-jet-powered rotor that burned a mixture of fuel and compressed air bled from two wing-mounted Napier Eland turboprops.