Те система дозаправки супертяжелых самолетов от летающего танкера -лодки
который в свою очередь заправлялся от танкера. Система испытывалась
на Атлантических линях -и должна была войти в серию в 1940г.
Те вполне современная система дозаправки.
-------------------------------------------------------------
[www.popularflying.com]
=============================================================
Cobham had founded Flight Refuelling Ltd and by 1938 had used FRL's looped-hose system to refuel aircraft as large as the Short Empire flying boat Cambria from an Armstrong Whitworth AW.23.[5] Handley Page Harrows were used in the 1939 trials to perform aerial refueling of the Empire flying boats for regular transatlantic crossings. From August 5 to October 1, 1939, sixteen crossings of the Atlantic were made by Empire flying boats, with fifteen crossings using FRL's aerial refueling system.[14] After the sixteen crossings further trials were suspended due to the outbreak of World War II
=========================================
[en.wikipedia.org]
--------------------------------------------------
Те речь идет о серийной технологической системе дозаправки для дальних перелетов.
Основные элементы этой системы послужили для создания технологии
дозаправки бомбардировщиков на БД -в 1949г.