on 29/1911 in Kyiv . set a world speed record of 111 km per hour on his C-6 plane in Dec 29 550 x 390 |
on 1/13/1942 . January 13 : first flight of Sikorsky R-4 an American two-place helicopter designed by with a single three-bladed main rotor and powered by a radial engine First helicopter to enter service with See more photos here: tco 5RsOsLeXpz tco CjetO2Z5qG |