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%ما هو (من)٪ 1 - تعريف
Rotating furnance; Rotating oven
contra-rotating
PARTS OF A MECHANISM ROTATING IN OPPOSITE DIRECTIONS ON A COMMON AXIS TO MINIMISE THE EFFECT OF TORQUE
Contra-rotation; Contrarotating; Contra-rotating propellers (marine)
¦ adjective rotating in the opposite direction or in opposite directions, especially about the same shaft.
Contra-rotating propellers
![Precious Metal]]'' at the 2014 [[Reno Air Races]]](https://commons.wikimedia.org/wiki/Special:FilePath/25 P 51XR Mustang N6WJ Precious Metal Reno Air Race 2014 photo D Ramey Logan.jpg?width=200 "Precious Metal]]'' at the 2014 [[Reno Air Races]]")
![[[Douglas XB-42 Mixmaster]]](https://commons.wikimedia.org/wiki/Special:FilePath/B-42 Mixmaster.jpg?width=200 "[[Douglas XB-42 Mixmaster]]")
![One of the four contra-rotating propellers on a [[Tu-95]] Russian strategic bomber](https://commons.wikimedia.org/wiki/Special:FilePath/Kuznetsov NK-12M turboprop on Tu-95.jpg?width=200 "One of the four contra-rotating propellers on a [[Tu-95]] Russian strategic bomber")
![Spitfire]] Mk XIX](https://commons.wikimedia.org/wiki/Special:FilePath/Supermarine Spitfire XIX vr.jpg?width=200 "Spitfire]] Mk XIX")
![[[XB-35]] Flying Wing showing its quartet of pusher contra-rotating propellers. The option was later discarded due to severe vibration in flight and later changed to traditional single rotating propellers.](https://commons.wikimedia.org/wiki/Special:FilePath/YB-35 42-13603 on the ramp.jpg?width=200 "[[XB-35]] Flying Wing showing its quartet of pusher contra-rotating propellers. The option was later discarded due to severe vibration in flight and later changed to traditional single rotating propellers.")
TWO-PROPELLER DESIGN FOR IMPROVING LOW-AIRSPEED MANEUVERABILITY
Contra-rotating propellors; Contra-rotating propeller; Contrarotating propellers; Contrarotating propeller; Contraprop
Aircraft equipped with contra-rotating propellers, also referred to as CRP, coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston or turboprop engine to drive a pair of coaxial propellers in contra-rotation. Two propellers are arranged one behind the other, and power is transferred from the engine via a planetary gear or spur gear transmission.
Rotating furnace
A rotating furnace is a device for making solid objects which have concave surfaces that are segments of axially symmetrical paraboloids. Usually, the objects are made of glass.
ويكيبيديا
Rotating furnace
A rotating furnace is a device for making solid objects which have concave surfaces that are segments of axially symmetrical paraboloids. Usually, the objects are made of glass. The furnace makes use of the fact, which was known already to Newton, that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid, identical to the shape of a reflecting telescope's primary focusing mirror.
Paraboloids can be used in various ways, including (after being silvered) as primary mirrors in reflecting telescopes and solar cookers.
