Hélice

This article is about the ancient Greek city. For the mythological nymph, see Helike (mythology). For the moon of Jupiter, see Helike (moon). Helike (Greek: pron. IPA // or //) was an ancient Greek city that sank in the winter of 373 BC at night. The city was located in Achaea, Northern Peloponnesos, two kilometres (12 stadia) from the Corinthian Gulf (coordinates: 38°13'09"N, 22°07'58"E). The related city of Boura was located nearby. Dr. Dora Katsonopoulou, President of the Helike Society, and Dr. Steven Soter of the American Museum of Natural History rediscovered the city in the summer 2001, near the village of Rizomylos. The World Monuments Fund included Helike in its 2004 List of 100 Most Endangered Sites in an effort to protect the site from destruction.
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n. propeller, screw, screw propeller

n. spiral, curve that twists around a fixed center point; three dimensional curve turning around an axis, helix; something having a spiral-like curve; propeller, screw

n. screw, helix; propeller

= blade, rotor blade, propeller.
Ex: The more blades a helicopter has then the lower the weight that is carried on each.
Ex: The design of helicopter rotor blades presents one of the greatest challenges to flight.
Ex: The propeller on an aircraft converts the turning power of an engine's crankshaft into the thrust force.