The Call's screenplay is by Richard D'Ovidio and feels very much like a fourth instalment in Larry Cohen's "phone trilogy", three infernally propulsive high-concept thrillers based around phones and confinement: Phone Booth, Cellular and Messages Deleted.
Such counter-rotating propellers are capable of significantly higher propulsive efficiency and higher disk loading than conventional propellers.
This undulatory propulsion has a higher propulsive efficiency and more precise manoeuvrability than most other species at low swimming velocity.
Especially, the design of an underwater vehicle with high propulsive efficiency has become a passion for many researchers and engineers.
The results indicate that one of the most outstanding advantages of two-phase underwater ramjet is its high propulsive efficiency with the order of 50 95%.
The other canonical hot-weather song of the sixties, "Summer in the City" finds the Lovin' Spoonful in surprisingly propulsive mode, celebrating high temperatures, summer love, and mutton chops.
Achieving a high propulsive efficiency for a jet engine is dependent on designing it so that the exiting jet velocity is not greatly in excess of the flight speed.
It has a high propulsive energy per unit mass, but it needs very large volumes (in comparison with kerosene): rockets fuelled with hydrogen are much larger than those fuelled with kerosene and have more problems of stability during flight.
First, in order to achieve a high propulsive efficiency, the jet velocity, or the velocity of the gas stream exiting the propulsor, is matched to the flight speed of the aircraft slow aircraft have engines with low jet velocities and fast aircraft have engines with high jet velocities.
It and the salmon shark are the thickest-bodied members of their family (length-depth ratio approaching 4.5), and consequently have the stiffest swimming style: they oscillate their tails while holding their bodies mostly rigid, which confers propulsive power with high energy efficiency, but at the cost of maneuverability.
It is characterized mainly by not propagated waves, that allow the mixing of intraluminal content in order to promote water and electrolytes absorption, and also by propulsive waves, including high (HAPCs) and low amplitude propagated contractions (LAPCs) [ 29– 31].
