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2. Coaxial-rotor aircraft - Wikipedia

   en.wikipedia.org/wiki/Coaxial-rotor_aircraft

   Coaxial rotors solve the problem of main rotor torque by turning each set of rotors in opposite directions. The opposite torques from the rotors cancel each other out. Rotational maneuvering, yaw control, is accomplished by increasing the collective pitch of one rotor and decreasing the collective pitch on the other. This causes a controlled ...

3. Tandem-rotor aircraft - Wikipedia

   en.wikipedia.org/wiki/Tandem-rotor_aircraft

   This is commonly accomplished by a tail rotor, coaxial rotors, and the NOTAR systems. Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift, whereas a single-rotor helicopter uses some of the engine power to counter the ...

4. Dual-rotor motor - Wikipedia

   en.wikipedia.org/wiki/Dual-rotor_motor

   The photo labelled FIG. 8 is from a patent application. It shows two rotors assembled into a single unit, with eight permanent magnets attached to the outer surface of the inner rotor, and eight to the inner surface of the outer rotor. [5] Vendors are working on both axial [6] and radial flux configurations. [7]

5. Intermeshing-rotor helicopter - Wikipedia

   en.wikipedia.org/wiki/Intermeshing-rotor_helicopter

   An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding.

6. Contra-rotating - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating

   A Soviet Ka-32 helicopter with coaxial contra-rotating rotors, in 1989. Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimise the effect of torque.

7. Today’s NYT ‘Strands’ Hints, Spangram and Answers for ...

   www.aol.com/today-nyt-strands-hints-spangram...

   Drag or tap letters to create words. If tapping, double tap the last letter to submit. Theme words fill the board entirely. No theme words overlap.

8. Boeing CH-47 Chinook - Wikipedia

   en.wikipedia.org/wiki/Boeing_CH-47_Chinook

   The CH-47 is powered by two turboshaft engines, mounted on each side of the helicopter's rear pylon and connected to the rotors by drive shafts. Initial models were fitted with Lycoming T55 engines rated at 2,200 hp (1,600 kW) each. The counter-rotating rotors eliminate the need for an antitorque vertical rotor, allowing all power to be used ...

9. It feels like there are suddenly way more plane crashes and ...

   www.aol.com/feels-suddenly-way-more-plane...

   The wreckage of a Delta Air Lines-operated CRJ900 aircraft lays on the runway after a plane crash at Toronto Pearson International Airport. - Cole Burston/Reuters