Этот источник хоть и хорош, но я предпочел бы не только его
http://en.wikipedia.org/wiki/Nieuport_17Initially, the Nieuport 17 retained the above wing mounted Lewis gun of the "11", but in French service this was soon replaced by a synchronised Vickers gun. In the Royal Flying Corps, the wing mounted Lewis was usually retained, by now on the improved Foster mounting, a curved metal rail which allowed the pilot to bring the gun down in order to change drums or clear jams. A few individual aircraft were fitted with both guns - but in practice this reduced performance unacceptably, and a single machine gun remained standard.
Можно увидеть различия - правда ?





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поиск по картинке дал следующее
