Anyway, I can have the propellers turning fast before you can get the anchor up.
Then her propellers began striking into something solider than air-charged suds, and she shot jerkily away in a current so torn with swirls that it looked like a great length of twisted green-and-white rope.
There she would hang quivering, until the accelerating engine would impart just the few added revolutions to the propellers that would give her the upper hand again.
Propellers made alone for the heavy air of the lower altitudes are not adapted to use in the rarefied atmosphere seven or eight miles up.
As he appeared on this the propellers had already attained a speed that drove the near-by spectators to flight.
This reserve propelling force was for use in case either of the other propellers became disabled, in which event both side propellers would of course have to be shut down.
Unlike a wind, with its varying gusts and puffs, the air hurled rearward by the propellers struck the two boys with a steady pressure.
The Ocean Flyer haspropellers that compress the thin air of the upper levels.
Even as he looked, his alert ears were strained for the rhythmic beating of the propellers and the low note of the vibration of the mammoth planes.
Different forms of propellers were used and out of this mass of statistics the engineer of the company and Alan had worked out formulas for speed computation.
When the propellers need attention we’ll attend to them.
Under the most powerful propellers ever made, the Ocean Flyer surrendered.
As Bob stumbled against the signal box and Buck’s weakened legs gave way beneath him, the propellers shot into high speed and the chug of the compressed air valves told that the big planes had been altered violently.
Power is applied to thepropellers by magnalium gearing.
He proposed similar screw-propellers at the stern, and suggested that they could be driven by animal or by steam-power.
Small airships have been designed to carry electric accumulators connected with various motor-driven propellers for raising, lowering, going ahead or astern, and steering.
The switches which control the passage of the current to these propellers are connected with a wireless telegraph receiver, so that each operation may be started or stopped by a particular ether wave or series of waves.
Before Crane had finished sending the message the crescendo whine of enormous propellers was heard.
Torn wide open by the forty-foot projectile, its engines wrecked and its helicopter-screws and propellers completely disabled, the helpless hulk plunged through two miles of empty air, a mass of wreckage.
Running awash and at full speed, U 247 literally scraped past the outlying rocks, the thresh of her propellers being deadened by the constant roar of the surf upon the far-flung ledges that thrust themselves seaward from the bold headland.
Grey predominated everywhere, from the leaden-coloured skies to the leaden-hued water churned by the propellers of a hundred grey-hulled warships.
Both her propellers had fouled some of the wreckage, and the bosses were stripped clear of their phosphor-bronze blades.
Beyond thepropellers there are two little vertical planes which can be moved to one side or the other by a control lever in front of the pilot's seat.
The flying machine designed by the elder Maxim consisted of a small platform, which it was proposed to lift directly into the air by the action of two screw-propellers revolving in reverse directions.
Two propellers are employed, and are fixed outside the car, one on each side, and almost in the centre of the vessel.
After repairs were effected tests of the machinery were first made at the docks with the ships lashed to the piers, the propellers being driven at low speed.
With its two propellersdriven by clutch and chain transmission, and its new automatic starter and fuel gauge, it was a marvel of beauty and utility, as readily sent up from the confined deck of a warship as from the broadest aero field.
Dave hoped there was power enough left in the propellers to make a sharp, quick turn.
He found that the propellers had gone through some strain during his adventure in the storm, and he had some little work to do with chisel, hammer and wrench.
The chief engineer had given them all the steam they would take, and the propellers thrashed the water mightily, but the ship slowed, slowed.
The engineer leaped to one of the propellers and swung his weight upon it.
There was an instant's pause, and the propellers took up their thrashing of the water again.
If you start the motors the wind from the propellers may blow the jelly away from the cabin.
The great propellers of the yacht thrashed mightily, and a narrow patch of open water opened in the silver sea.
The propellers dragged at the plane, and it suddenly darted forward down the narrow lane of open water cleared by the three explosions.
Again and again the propellers beat the water at the stern into froth and foam, but never did the yacht move by as much as an inch.
The two sailing ships in tow, very properly, tried to foul E12's propellers and "also opened fire with rifles.
So swept but surviving, half drowned but still driving, I watched her head out through the swell off the shoal, And I heard her propellers roar: "Write to poor fellers Who run such a Hell as the North Sea Patrol!
Some experts maintain that it is because there are two propellers on the Wright machine and only one on the Voisin, and consequently double the propulsive power is exerted.
All screw propellers having a pitch equal to their diameters have the same angle for their blades at their largest diameter.
While operating on the same general principle, aerial propellers are much larger than those used on boats.
One or more screw propellers may be applied for propelling when steam power is employed.
The diameter is the distance from end to end of the blades, which on the largest propellers ranges from 6 to 8 feet.
But this is not a fair deduction, unless both propellers are of the same size.
These curves showed that the tips of long-bladed propellers were inefficient, as was also the portion of the blade near the root.
This necessitates the aerial propellers being much larger than those employed for marine purposes.
It is equipped with two rear propellers operated by a Ramsey 8-cylinder motor of 50 horsepower, placed horizontally across the lower plane, with the crank shaft running clear through the engine.
It is the object of all men who design propellers to obtain the maximum of thrust with the minimum expenditure of engine energy.
On the Wright machine two wooden propellers of two blades each (each blade having a decided "twist") are used.
When manual power is employed the body is placed horizontally, and oars or propellers are actuated by the arms or legs.
The helicopter gets its name from being fitted with vertical propellers or helices (see illustration) by the action of which the machine is raised directly from the ground into the air.
There was a low rumble that quickly mounted to a staccato roar as the great propellers began whirling and the engines took up the load.
Then in a time so brief that it seemed never to have happened, it was gone, and only the distant drone of the other ships' propellers came to them.
It seemed some monstrous black bat flying there against the sky, but down to the sensitive microphone on the side of the Solarite came the drone of the hundred mighty propellers as the great plane forged swiftly along.
Its mighty propellers still idling slowly, the huge plane rolled to a standstill.
For another instant the great motors continued turning, the roar of the propellers like some throbbing background to the rending crashes as the titanic wreck came to rest.
In an instant the whirr of the hundreds, thousands of giant propellers was drowned in a terrific roar of air.
The Solarite hovered high above the dark ship at length, the roar of the terrific air blast from itspropellers below coming up to them as a mighty wave of sound that made their own craft tremble!
For an instant there came the sound like a mighty buzz-saw as the giant propellers of one wing cut into the body of the careening plane.
Now they could see a great air liner, twice the size of their plane, taking off for Japan, its six giant propellers visible only as flashing blurs as it climbed up toward them.
The hundred gigantic propellers roaring below, however, would distribute their gas perfectly.
The roar of its mighty propellers was a rumbling thunder to the men in the Solarite.
For some reason the apparatus they use to propel them in space is inoperative in air, but their propellers will drive them forward faster than any plane Earth ever saw.
Then in an instant it was gone--and they saw that the huge black bulk behind them was wavering, turning; the thunderous roar of the propellers fell to a whistling whine; the ship was losing speed!
Still the motors on the other side of the ship continued roaring and the giant propellers turned.
A boat driven with four propellers is called a quadruple-screw boat.
A boat that has two propellers is called a twin-screw boat.
While the propellers churned the Mediterranean waters into a restless wake at the stern, Stuart walked the decks like a man demented.
Her face and glance were turned outward where the propellers were churning up a lather of white spume and where little eddies of jade and lapis-lazuli raced among the bubbles.
White-winged vessels, pioneers of the summer squadron, waited without while the propellers turned their knife-bladed bows into the ice, and cut a pathway through.
He let her come gently beyond the spot; reversed the propellers just at the right time, and backed neatly alongside.
The blossoms, with their four curved petals, seemed to spin like tiny white propellers in the bright air.
Immediately afterwards our propellers were swung and we rose into the air like two great birds in quest of other and pleasanter climes.
With the moonlight lying like a benediction over the fields and forests of Maine, the Snowbird, her motor humming like a huge bumble-bee, and her propellers and controls working in perfect order, swept on her course into the northwest.
He touched the lever by which the propellers were started.
The propellers were, of course, started with the first stroke of the motor.
Jack increased the revolutions of the propellers a trifle and the ship responded like a spirited horse to the spur.
The floundering of the great propellers seemed alternately to compress and expand the damp atmosphere.
An empty freighter with propellers flailing half out of water pounded through the yellow mist close to them.
Side wheel steamers for inland waters, and screw propellers for sea service, however, in time established their fitness for their respective scenes of action.
She had twopropellers on the same axis, but revolving in opposite directions, one being on the central shaft and the other on a concentric tube.
In fact, when the submarine was under water the vibrations, due to the peculiar shape of its propellers and hull, and to its electric motors, produced sound waves that resembled nothing else in art or nature.
It was impossible to use these listening devices while the boats were under way, for the sound of their own propellers and machinery would drown out any other disturbances.
Hours passed sometimes without even the encouragement of a "nibble"; then, suddenly, one of the listeners would hear something which his experienced ear had learned to identify as the propellers and motors of a submarine.
The swishing of the water on the sides and the slow churning of the propellers were the only sounds that could possibly betray the ships to their hidden enemies.
It knew that the chasers were on the trail; its propellers were revolving so slowly that almost no noise was made; the U-boat was stealthily trying to throw its pursuers off the scent.
Propellers may be fastened to front, rear, or both, to create the appearance of a real aeroplane.
The pivots for the propellers were flat-head wire nails small enough for the blades to revolve freely, but driven securely into the air-ships.
The propellers were gilded and the ships painted in bright colours.
Supposing we desire to construct a helicopter of a more ambitious and scientific character, possessing a vertically rotating propeller or propellers for horizontal propulsion, as well as horizontally rotating propellers for lifting purposes.
Equally good flights have also been obtained with the two propellers behind, one revolving in the immediate rear of the other.
Calling these two wires A and B, and two propellers x and y, then x is first tried on A and y on B.
The best position for the propellers appears to be one in front and one behind, when extreme lightness is the chief thing desired.
Both in the case of marine and aerial propellers multiplicity of blades (i.
One advantage in using such a motor as this is that the two equal strands untwisting in opposite directions have a decided steadying effect on the model, similar almost to the case in which two propellers are used.
The most obvious solution of the problem is to use two equal propellers (as in the Wright biplane) of equal and opposite pitch, driven by two rubber motors of equal strength.
When the horizontally revolving propellers are driven in a horizontal direction their "lifting" powers will be materially increased, as they will (like an ordinary aeroplane) be advancing on to fresh undisturbed air.
The advantage of using propellers having hollow-faced blades and large diameter.
For the longest possible flight twin propellers revolving in opposite directions[41] are essential.
The solution of the problem of steering by the use of two propellers is only partially satisfactory and reliable, in fact, it is no solution at all.
Also for framework of light fabric covered propellers as well as for skids and shock absorber--also for hooks to hold the rubber motor strands, etc.
Alone in my pit, with the dull whir of my propellers alone breaking the silence of the night, I pondered the startling events of the past few hours.
The helicopter mounted straight up; its whirling propellers above sent a rush of air downward.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "propellers" in a variety of sentences. We hope that you will now be able to make sentences using this word.
