counterrotating

American  

[koun-ter-roh-tey-ting, koun-] / ˈkaʊn tərˈroʊ teɪ tɪŋ, ˌkaʊn- /

adjective

Machinery.

1. (of two corresponding or similar moving parts) rotating in opposite directions.

   counterrotating propellers.

---

Etymology

Origin of counterrotating

counter- + rotating ¹ ( def. )

Example Sentences

When we turn on the fans, the frequencies at which the cavity resonates are different for counterrotating sound waves, similar to how Zeeman splitting changes the energy of light’s interactions in a ferrite.

From Scientific American

To accomplish all this, the helicopter’s twin, counterrotating rotor blades needed to spin at 2,500 revolutions per minute — five times faster than on Earth.

From Washington Post

The helicopter is a bit bigger than a softball, minus its four carbon-fiber blades, which spin on two counterrotating rotors and sits on four legs, each 15 inches long.

From Scientific American

“Only the Russians built a twin, counterrotating propeller airplane,” said Harry, who in his 33-year career worked on such U.S. aircraft as the F-14, the F-18 and the F-35.

From Washington Post

Brave test pilots willing to stand on a flying platform above two counterrotating helicopter blades could fly the HZ-1 Aerocycle, an experimental vehicle designed to allow Army soldiers to scout future battlefields at more than 100 kilometers per hour.

From Scientific American