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2. Helicopter rotor - Wikipedia

   en.wikipedia.org/wiki/Helicopter_rotor

   A quad rotor or quadrotor comprises four rotors in an "X" configuration. Rotors to the left and right are in a transverse configuration while those in the front and to the rear are in a tandem configuration. An advantage of quad rotors on small aircraft such as drones is the opportunity for mechanical simplicity.

3. Helicopter flight controls - Wikipedia

   en.wikipedia.org/wiki/Helicopter_flight_controls

   Any rotor system has a delay between the point in rotation where the controls introduce a change in pitch and the point where the desired change in the rotor blade's flight occurs. This difference is caused by phase lag, often confused with gyroscopic precession. A rotor is an oscillatory system that obeys the laws that govern vibration—which ...

4. Disc brake - Wikipedia

   en.wikipedia.org/wiki/Disc_brake

   On automobiles, disc brakes are often located within the wheel A drilled motorcycle brake disc. The development of disc-type brakes began in England in the 1890s. In 1902, the Lanchester Motor Company designed brakes that looked and operated similarly to a modern disc-brake system even though the disc was thin and a cable activated the brake pad. [4]

5. Brake lining - Wikipedia

   en.wikipedia.org/wiki/Brake_lining

   The brake lining is that part of the brake pad which actually contacts the metal brake disc (rotor) when the brake is engaged. Using a typical bicycle brake as an example, the backing would be the metal shell which provides mechanical support, and the lining would be the rubbery portion which contacts the rims when the brakes are applied.

6. Tandem-rotor aircraft - Wikipedia

   en.wikipedia.org/wiki/Tandem-rotor_aircraft

   However, the rear rotor works in the aerodynamic shadow of the front rotor, which reduces its efficiency. This loss can be minimized by increasing the distance between the two rotor hubs, and by elevating one hub over the other. [4] [5] Tandem-rotor helicopters tend to have a lower disk loading than single-rotor helicopters. [6]

7. Today's Wordle Hint, Answer for #1243 on Wednesday, November ...

   www.aol.com/todays-wordle-hint-answer-1243...

   If you’re stuck on today’s Wordle answer, we’re here to help—but beware of spoilers for Wordle 1243 ahead. Let's start with a few hints.