According to the Centennial of Flight Web Site
“Retracting landing gear was not a completely new idea in the 1920s. J.W. Wartin's Kitten, built in 1917, had retractable gear (but could not actually fly). The Dayton Wright RB-1 of 1920 and the Verville Sperry R-3 of 1922 also had retractable gear. But these aircraft were rarities…”
“The Boeing Monomail, which first appeared in 1930, and the Lockheed Orion are generally considered pioneers in the development of retractable landing gear, proving that it was practical.”
Read more about retractable landing gear here http://www.centennialofflight.gov/essay ... Tech16.htm
Ainakin korostetusta koneesta löytyy youtubesta pienoismallin lennätysvideo. Muista on tekstiä ja kuvia.
Niinpä Itänaapuri ei saa kunniaa ensimmäisestä lentokoneesta (I-153), jossa oli sisäänvedetyt laskutelineet
. Koneen ensimmäinen versio oli I-5 v. 1930, josta kehitettiin monien kehitysversioiden jälkeen proto 1938, jonka tyypiksi tuli I-153 v.1939.t. Kippari