Οι
φιλέλληνες είναι ένα ιδιαίτερο κεφάλαιο στην ελληνική ιστορία, που
βοήθησαν τη χώρα σε δύσκολες στιγμές. Ο Ηλίας Κόκκινος ανήκει σε αυτή
την κατηγορία ανθρώπων που όταν ήρθε στην Ελλάδα προσέφερε μεγάλο καλό.
By the mid-1940s the limitations of piston aero engines were
becoming apparent. Every possible scheme to squeeze the last bit of
power from the internal combustion engine was tried. One of the most
successful innovations was the contra-rotating propeller arrangement
whereby two sets of propellers driven by one engine and sharing a common
axis are contra-rotated (with one set travelling clockwise and the
other anticlockwise). This system, though insanely noisy, produced more thrust than
an equivalent conventional arrangement. It also produced some of the
most insane flying machines ever to have deafened their ground crew.