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  2. ULPower Aero Engines - Wikipedia

    en.wikipedia.org/wiki/ULPower_Aero_Engines

    The 6 cylinder engines can power larger experimental and kit-planes (non-certified planes) that are typically powered by Lycoming and Lycoming clones in the O320-O360 range. [6] The ULPower engines are modular. They all have the same bore of 105.6 mm. The stroke is either 74 or 100 mm, which makes the 260 and 350 series of engines.

  3. Electrical equipment in hazardous areas - Wikipedia

    en.wikipedia.org/wiki/Electrical_equipment_in...

    Unlike ATEX which uses numbers to define the safety "Category" of equipment (namely 1, 2, and 3), the IEC continued to utilise the method used for defining the safe levels of intrinsic safety namely "a" for zone 0, "b" for zone 1 and "c" for zone 2 and apply this Equipment Level of Protection to all equipment for use in hazardous areas since ...

  4. UL 94 - Wikipedia

    en.wikipedia.org/wiki/UL_94

    UL 94, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing, is a plastics flammability standard released by Underwriters Laboratories of the United States. [1] The standard determines the material's tendency to either extinguish or spread the flame once the specimen has been ignited.

  5. List of ultralight helicopters - Wikipedia

    en.wikipedia.org/wiki/List_of_ultralight_helicopters

    JH-2 China Dynali H3 & AK1-3 parts [14] Gray Zhu bi-place heli China 2 seat bi-place copter [15] Lightest coaxial heli China Single seat coaxial heli [16] Coaxial black heli China Coaxial Single Seater [17] Shandong coax heli China Coaxial Single Seater [18] Guo Leiting's Coax China Yuncheng Farmer's Chopper Shantou Copters China Homebuilt ...