5 sentences with 'helicopters'

Example sentences and phrases with the word helicopters and other words derived from it.

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« Over three years, for nine days, three groups of soldiers completed a demanding exercise: relentlessly escaping from pursuit by dogs, helicopters and other troops. »
« This revolutionary machine has all the advantages of the old helicopters, but is capable of developing the speed of an aeroplane. The "avioncopter" is a successful response to the needs of the times, for the Darwinian apothegm "evolve or die" also applies in the history of aviation. »
« The use of ships, planes, helicopters and tracked vehicles (when using naphtha) leaves residues of lead, a compound that is used in an anti-knock mixture that is added to fuel so that it does not explode when vehicles are started. Also, although to a lesser extent, fuel oil and paraffin release lead. »
« In the 1980s came the Advancing Blade Concept for helicopters, with two rotors turning in opposite directions. It is true that this model improved speed records, but as William of Occam would say, why unnecessarily duplicate the entities? Moreover, its manufacture was very complicated and the consumption of its engines was enormous. »
« The same company also shipped civilian helicopters from Germany to Spain and Austria, where they were converted into military aircraft and re-shipped to Iraq. The company is adamant that it was not aware of the evil transformation of these helicopters, even though it owned 11 percent of the Spanish company that was involved in the work. »

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