| 单词 | screw propeller |
| 释义 | > as lemmasscrew propeller screw propeller n. (originally) a device for propelling a ship or boat, consisting of a helical surface or blade winding around a shaft that is turned by a piston; (in later use) a propeller consisting of multiple blades set at an angle on a central shaft or boss, used esp. for propelling a ship or aircraft.Now usually called propeller (propeller n. 1b, propeller n. 1c).The earliest screw propellers resembled and were based on the same principles as Archimedes' Screw. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > equipment of vessel > propulsion machinery > [noun] > propeller > types of screw propeller1835 screw1839 reversing propeller1849 contrapropeller1927 1835 Jrnl. Franklin Inst. 20 16 Were our canals and rivers filled with some semi-fluid, having a good portion of tenacity, these screw propellers might travel onward without scattering or communicating a rotary motion to it, as they do to water. 1938 E. G. Richardson Physical Sci. Mod. Life xii. 251 It is proposed on stratosphere flights to bring it [sc. the rocket] into play only after the usual screw propeller has done its work in driving the aircraft through the troposphere. 2001 Navy News Sept. 28/4 In 1836 a farmer called Francis Pettit Smith used a screw propeller derived from a model boat to power a steam launch from the Thames Estuary to Folkestone. < as lemmas |
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