Hi! Nikitin- Shevchenko IS-1, IS-2, IS-4, IS-14 and IS-18.
http://www.dogswar.ru/stat-o-wow/4009-poslednie-biplany-ss.html?start=2
"One of the vitavshih ideas then in the designers ' heads was the following: Could the best properties of manoeuvrable biplanes and high-speed last be combined in one machine? This question was tried to answer aircraft-self-taught Shevchenko. Monobiplan is a plane with two wings on takeoff and landing, and one on the main regimes-that's what the designer would have helped the then aviation. How do we get rid of this obstructive, extra wing-of course not forever, of course, but until the end of the flight, when the car starts to land and it needs to be filled with a lack of lift by increasing the bearing area
The conclusion of the An is a retractable wing. But the wing is a very responsible and complex element of the structure with enormous loads. Not so long ago, there was a retractable chassis on the airplanes, forcing the designers to solve a lot of complex technical problems. Would not the cleaning of the wing of undesirable changes in the aerodynamics of the machine, how would the consoles behave, and would the wing become a source of destructive fluctuations? These questions could be answered by the calculations Produvk in the wind tunnel, finally the pilot aircraft's flight tests.
In November 1938, at the scientist of the Council of the Shevchenko Air Force, he reported on a sketched project of such a machine. At the beginning of 1939, shows the authoritative commission a full-size layout, and finally takes a sample from the assembly shop.
The Mi-1 was called A is blasted with in a giant wind tunnel. M. B. Keldysh, future president of the USSR, checked his vibrations. In June 1940, Monobiplan first ascended into the air, and after a month, a pilot of the Air Force Tester, now emeritus USSR pilot, the hero of the Soviet Union, George Shilnov is conducting the first cleaning of a wing in flight. Obletyvali Mi-1 Testers Stepan Suprun and Alexei Grinchik, later in our aviation history as the first reactive MIGA. In January 1940, the second Monobiplan, the Mi-2, was ready.
The third combat fighter, the Mi-4, was completed with a powerful 18-ciliidrovym engine of liquid cooling m-120. Already tried Monobiplany demonstrated excellent properties. Doting, speed has increased, but the engine revolution has not changed-the air resistance has been reduced. When landing high-speed, the cars again released the removed wings and became craft consisted. The aircraft were at a minimum landing site.
The health of Shevchenko itself can be surprising: in parallel with the center fighter, the Monobiplan of the 3 chassis is designed. The maximum speed is 720 km/h, and the landing through the extra wing is only 107 km/h!
Four "Live", bomber specimens and eighteen projects of retractable wing aircraft-the outcome of the team and its leader from 1938 to 1941."
Justo san's contribution.
http://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=3359.0;attach=27072;image
Wikipedia.
https://en.wikipedia.org/wiki/Nikitin-Shevchenko_IS