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A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of the corkscrew-like flagella of many prokaryotes).
The propeller problem was overcome by replacing the de Havilland variable-pitch propellers with Fairey-Reed fixed-pitch propellers, modified aircraft being re-designated the DHA-3 Mk. 1F. All but the three aircraft that had crashed by that time were brought to this standard. The propeller change however did nothing to improve the type's ...
Propeller whirl flutter is a special case of flutter involving the aerodynamic and inertial effects of a rotating propeller and the stiffness of the supporting nacelle structure. Dynamic instability can occur involving pitch and yaw degrees of freedom of the propeller and the engine supports leading to an unstable precession of the propeller. [13]
Bell Model 15B, production variant with three-bladed Aeroproducts constant speed propeller. 229 built. [85] [86] P-39F-2 27 conversions from P-39F for ground attack and tactical reconnaissance. [85] [86] P-39G Bell Model 26, 1800 ordered, intended to be a P-39D-2 with a different propeller. Later cancelled, with aircraft delivered as P-39K, L ...
A British aircraft carrier that had been set to lead the largest NATO exercises since the Cold War will not set sail Sunday after a problem with its propeller was discovered during final checks ...
Jet propulsion is produced by some reaction engines or animals when thrust is generated by a fast moving jet of fluid in accordance with Newton's laws of motion.It is most effective when the Reynolds number is high—that is, the object being propelled is relatively large and passing through a low-viscosity medium.
A professional photographer died in a horrible accident by backing up into an airplane propeller while snapping photos at a Kansas airfield. Amanda Gallagher, 37, was taking photos of people ...
The performance of a propeller suffers when transonic flow first appears on the tips of the blades. As the relative air speed at any section of a propeller is a vector sum of the aircraft speed and the tangential speed due to rotation, the flow over the blade tip will reach transonic speed well before the aircraft does.