These 2 ballonets enable the ship to be trimmed by merely pumping air into either at the expense of the other.
The system of employing 2 ballonets has been borrowed from the Parseval type, and presumably the Parseval system of working the automatic valves has also been adopted.
Parseval uses a comparatively small car, and distributes the weight by hanging it further below the balloon than usual, and also by using 2 ballonets which are placed one near each end of the gas bag.
Two air ballonets were contained in the envelope at bow and stern and the ascent and descent of the ship was regulated by the quantity of air pumped into these.
The space between the ballonets and the outer skin was pumped full of air to keep the latter taut and rigid.
There was little or no wind, and her drift was in consequence almost imperceptible; while the temperature was so constant that there was no necessity to alter the volume of brodium in the ballonets for hours at a stretch.
Not until it was fully light would Fosterdyke reduce the gas in the ballonets and rely upon the planes for "lift.
Kenyon and Bramsdean were of the same opinion, for the loss of brodium through the punctured ballonets seemed a fatal obstacle to the immediate resumption of the flight.
The heat caused the gas in the still intact ballonets to expand, affording sufficient lifting power to heave the wreckage almost clear of the water.
Further examination revealed the fact that half the number of the ballonets were holed.
The sooner the better, because several of the ballonets are showing distinct symptoms of porosity.
To make matters worse, some of the patches on the repaired ballonets were leaking, for owing to the heat of the rubber the solution was not holding well.
The engineer reported that the after propeller was damaged; another man announced that there was a large gash in the aluminium envelope, and that several of the after ballonets were leaking rapidly.
To counteract this, a certain quantity of brodium is exhausted from the ballonetsinto cast-iron cylinders, where it is stored under pressure until required again.
The ballonets were practically empty save the four or five for'ard ones.
In less than fifteen seconds from the time the hawser had been slipped the hydrogen escaping from the leaky ballonets was ignited.
With her ballonets charged sufficiently to give her a slight lift, the airship rose until the base of the fuselage was a bare three feet from the ground.
The lifting part of the airship comprises a single gas bag fitted with two ballonets provided to ensure the requisite gas-tension in the main envelope, while at the same time permitting, in times of emergency, a rapid change of altitude.
Self-contained blowers contribute to the preservation of the shape of the envelope, the blowers and the ballonets being under the control of the pilot.
In this manner the gas-pressure becomes reduced until the ballonets are enabled to exercise their intended function.
If these ballonets empty owing to the pressure of the gas within the envelope, a rope system disposed within the balloon and connecting the ballonets and the gas-valve at the top is stretched taut, thereby opening the gas-valve.
In the ordinary non-rigid balloon, the pumping of air between the ballonets aids in controlling longitudinal equilibrium.
Pressures (net) in the main envelope are from three-fifths to one and a quarter ounces per square inch, those in the ballonets being somewhat less.
A rather peculiar grouping of such ballonets was used about the prolonged stern of the Ville de Paris.
Ballonets are therefore fitted to prevent this happening.
Two ballonets are provided, one forward and one aft, the capacity of each being 6,375 cubic feet.
The ballonets are empty, and remain so throughout the ascent.
Valves are provided to prevent the pressure in the envelope from exceeding a certain determined maximum and are fitted both to ballonets and the gaschamber.
The envelope was so exceedingly strong that a high pressure of gas could be sustained, and ballonets were considered unnecessary, but relief valves were employed.
At a later date 240 horse-power Fiat engines were installed, and the engineers' cabin was modified and an auxiliary blower was fitted to supply air to the ballonets for use if the engines are not running.
Ballonets are internal balloons or air compartments fitted inside the main envelope, and were originally filled with air by a blower driven either by the main engines or an auxiliary motor.
In rigid airships ballonets are not provided for the gasbags, and as a consequence a long flight results in a considerable expenditure of gas.
On making a second ascent, as the airship rises the air must be let out of the ballonet instead of gas from the envelope, and by the time 1,000 feet is reached the ballonets will be empty.
Usually from two to three ballonets are provided, according to the size of the air-ship.
Meusnier just proposed that air-bags or ballonets as they are now called be placed inside the balloon proper.
It consists of a number of ballonets filled with highly inflammable gas, and around those ballonets are ribs of aluminium and steel.
And that current, sparking over the interstices between the aluminium lattice-work and envelope of a Zeppelin, must certainly ignite the inflammable gas with which the ballonets are filled and which is so constantly escaping.
A man on duty in the gondola thrust down a lever, Instantly the gas in several of the ballonets was withdrawn and forced under great pressure into a strong metal tank.
Two of the after ballonets are perforated too badly to be patched.
Then other ropes were lowered from the 'midship portion of the Zeppelin while simultaneously gas was exhausted from some of the ballonets to neutralise her buoyancy.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ballonets" in a variety of sentences. We hope that you will now be able to make sentences using this word.
