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2. Propfan - Wikipedia

   en.wikipedia.org/wiki/Propfan

   One of the earliest engines that resembled the propfan concept was the 4,710 pounds-force (21.0 kilonewtons) Metrovick F.5, which featured twin contra-rotating fans—14 blades in the fore (front) fan and 12 blades in the aft (back) fan—at the rear of the engine and was first run in 1946.

3. Hand fan - Wikipedia

   en.wikipedia.org/wiki/Hand_fan

   Handheld Brise fan from 1800. A handheld fan, or simply hand fan, is a broad, flat surface that is waved back-and-forth to create an airflow. Generally, purpose-made handheld fans are folding fans, which are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted on slats which revolve around a pivot so that it can be closed when not in use.

4. European hand fans in the 18th century - Wikipedia

   en.wikipedia.org/wiki/European_hand_fans_in_the...

   Hand fans first arrived in Europe in the 15th century from Asia and became popular in the 16th century. Several fan styles were common and a plethora of materials were used to create them. Subject matter varied greatly, from Biblical scenes to landscapes. Hand fans serve as a cooling mechanism, social instrument, and fashion accessory.

5. Hand Fan Museum - Wikipedia

   en.wikipedia.org/wiki/Hand_Fan_Museum

   The Hand Fan Museum is a museum of hand fans located in Healdsburg, California, United States. [1] [2] [3] It is the only fan museum in the USA. [4] History.

6. Titanium alloys - Wikipedia

   en.wikipedia.org/wiki/Titanium_alloys

   Titanium alone is a strong, light metal. It is stronger than common, low-carbon steels, but 45% lighter. It is also twice as strong as weak aluminium alloys but only 60% heavier. Titanium has outstanding corrosion resistance to seawater, and thus is used in propeller shafts, rigging and other parts of boats that are exposed to seawater.

7. List of blade materials - Wikipedia

   en.wikipedia.org/wiki/List_of_blade_materials

   A variety of blade materials can be used to make the blade of a knife or other simple edged hand tool or weapon, such as a sickle, hatchet, or sword. The most common blade materials are carbon steel, stainless steel, tool steel, and alloy steel. Less common materials in blades include cobalt and titanium alloys, ceramic, obsidian, and plastic.