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2. List of soft contact lens materials - Wikipedia

   en.wikipedia.org/wiki/List_of_soft_contact_lens...

   Types. The FDA classifies soft contact lenses into four groups for the US market. They are also subcategorized into 1st generation, 2nd generation, and 3rd generation lens materials. [6] These 'water-loving' soft contact lens materials are categorized as "Conventional Hydrophilic Material Groups ("-filcon"): Group. Water Content.

3. Horizon Hobby - Wikipedia

   en.wikipedia.org/wiki/Horizon_Hobby

   The Horizon Hobby logo. Horizon Hobby, LLC is an American multinational hobby-grade RC radio control (RC) model and model train manufacturer and distributor founded by Rick Stephens, Janet Ottmers, Debra Love, and Eric Meyers [1] in July 1985 [2] and headquartered in Champaign, Illinois. [3] Horizon Hobby products are sold in more than 50 ...

4. Radio-controlled aircraft - Wikipedia

   en.wikipedia.org/wiki/Radio-controlled_aircraft

   An RC flyer demonstrating knife edge flying. A radio-controlled aircraft (often called RC aircraft or RC plane) is a small flying machine that is radio controlled by an operator on the ground using a hand-held radio transmitter. The transmitter continuously communicates with a receiver within the craft that sends signals to servomechanisms ...

5. Radio-controlled helicopter - Wikipedia

   en.wikipedia.org/wiki/Radio-controlled_helicopter

   RC Helicopters usually have at least four controls: roll - cyclic pitch, elevator (fore-aft cyclic pitch), rudder (yaw) and pitch/throttle (collective pitch/power). For simple flight, the radio is usually configured such that pitch is around −1 degree at 0% throttle stick, and somewhere around 10 degrees at 100% throttle stick.

6. Radio-controlled model - Wikipedia

   en.wikipedia.org/wiki/Radio-controlled_model

   1:10 scale radio-controlled car. ( Saab Sonett II) A radio-controlled model (or RC model) is a model that is steerable with the use of radio control (RC). All types of model vehicles have had RC systems installed in them, including ground vehicles, boats, planes, helicopters and even submarines and scale railway locomotives.

7. CR-39 - Wikipedia

   en.wikipedia.org/wiki/CR-39

   The first commercial use of CR-39 monomer (ADC) was to help create glass-reinforced plastic fuel tanks for the B-17 bomber aircraft in World War II, reducing the weight and increasing the range of the bomber. After the war, the Armorlite Lens Company in California is credited with manufacturing the first CR-39 eyeglass lenses in 1947.