The studies were intended to identify key technology development needs to enable the envisioned advanced airframes and propulsion systems.
With swift, vigorous propulsion of hands and feet, he lifted his shoulders and half his chest out of water.This was to gain impetus for the descent.
The propulsion subsystem is essential for maneuvering the MUOS satellite during transfer orbit to its final location as well as conducting on-orbit repositioning maneuvers throughout its mission life.
The work at Cornell is testing hypotheses of insect propulsion and control.
The researchers acknowledge that some propulsion system technology still needs to be explored.
Find a propulsion signature from an alien spacecraft: Hey, if it worked for the Vulcans in Star Trek, why not us?
It would be nice, therefore, if all the on-board paraphernalia of propulsion and control could be dispensed with, leaving an unencumbered device that is still capable of directed flight.
A novel part of the design is a second propulsion system that simulates low-gravity environments.
The large structure also allows engineers to explore different propulsion architectures for the plane, such as a distributed system of multiple smaller engines.
The best concepts for antimatter propulsion require that the antiprotons be collected and isolated.
Due to the low cost of the battery cells and excellent performance at ambient temperature, Lithium-ion (Li-ion) battery is a promising technology for propulsion applications.
The drive wheels then rotate as necessary, to achieve both balance and propulsion.
Given realistic propulsion options, and the requirement that the spacecraft can slow down to orbit its target, the target star cannot be more than 15 light-years from Earth.
Each sub will have one or two pilots onboard who use pedals or some other propulsion system to guide their vessel across the 328-foot (100-meter) submerged racecourse the fastest.
The propulsion system consists of five F-1 engines.
Into the 20th century, steam propulsion became so advanced that you could ride a giant steamer across the ocean.
That the oldest technology of flight will find a role supporting the latest, fusion propulsion, has a certain poetic justice.
國文精選館
