The only propelling
force it ever exhibited, was the mere impetus acquired from the descent of the inclined plane ; and this impetus carried the machine farther when the vanes were at rest, than when they were in motion - a fact which sufficiently demonstrates their inutility ; and in the absence of the propelling
, which was also the sustaining power, the whole fabric would necessarily descend.
The tiresome maneuvering had carried them about in circles back and forth across the harbor, but by it Number Thirteen had himself learned something of the proper method of propelling
and steering his craft.
The gases expand instantly, propelling
the shell skyward.
The three-ball gizmo would move by a series of transformations in which each arm elongated or contracted, changing the spacing between the balls and propelling
the device forward, reported Iranian physicists Ramin Golestanian of the Institute for Advanced Studies in Basic Sciences in Zanjan and Ali Najafi, now at Zanjan University.
The X-43 then will fire its experimental engine for about 10 seconds, with hopes of propelling
it to Mach 10.
On average, residents were observed propelling
their wheelchairs on only four of the 96 observations.
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