. Navigazione aerea . peso. Oltre a ciò, ottennero stabilità e rigidità con l'uso di un air bag interno e di un modo di sospensione più abetter, e racchiuperarono l'intero apparato in un capannone, in modo che esso potesse essere mantenuto costantemente gonfiato e attendere giorni calmi per l'esperimento. Questa nave aerea, che è stata chiamata la France, ha tenuto 65,836cubb. Ft. Di idrogeno, E la sua potenza di sollevamento era di 4,402 lbs.la macchina era molto lunga (105 ft.), per equalizzare il peso sopra il pallone e tuttavia ammettere che entrambi sono piazzati insieme, al fine di portare i dispositivi di propulsione come vicino alla linea centrale del grav

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. Aerial navigation . s weight. Besides this, they obtained stabil-ity and stiffness by the use of an internal air bag and abetter mode of suspension, and they enclosed the wholeapparatus in a shed, so that it might be kept permanentlyinflated and await calm days for experiment. This air-ship, which was named La France, held 65, 836cub. ft. of hydrogen, and its lifting power was 4, 402 lbs.The car was very long (105 ft.), in order to equalize theweight over the balloon and yet admit of both being placedclose together, in order to bring the propelling arrange-ments as near the center line of gravity as possible. The screw was placed on the car ; it was with two arms, and23 ft. in diameter. The power of the motor was ascer-tained by experiment in the shop to amount to 9 H. P., and speeds of 17 to 20 miles per hour were expected with46 revolutions of the screw. Fig. 4 represents this air-ship. The first trial was made on August 9, 1884, and on acalm afternoon the balloon ascended, proceeded some 2 tFmrn^^ffMfS. Fig. 4. miles from the shed, and returned to its original starting-point, having proved perfectly manageable, and attained aspeed of 10J miles per hour. This was the first time thata navigable balloon had returned to its landing, and theexperiment attracted great attention, an account of it be-ing, a few days thereafter, presented to the French Acad-emy of Sciences. The aeronauts believed they could makestill greater speed, but for obvious reasons they jealouslyguarded such details of construction as were not apparentfrom casual inspection in the air, and more particularly theconstruction of their motor and battery, concerning whichmore will be said hereafter. A second ascension was made on September 12, 1884(14 days before the last ascension of Tissandier), but al-though a speed of over 12 miles per hour was attained, anaccident to the machine (heating of journals) compelledlanding at Velizy, instead of returning to the starting-point. The latter was, however, s

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• bookidae
• booksubjectaeronautics