3-view drawing of the late 1930s Soviet experimental <a href="https://en.wikipedia.org/wiki/en:NIAI_RK-I" class="extiw" title="w:en:NIAI RK-I">NIAI RK-I</a> airplane.
<a href="//commons.wikimedia.org/wiki/User:MLWatts" title="User:MLWatts">MLWatts</a>
<span class="int-own-work" lang="en">Own work</span> based upon <a rel="nofollow" class="external text" href="http://www.ctrl-c.liu.se/misc/ram/rk-i.html"><i>RK-800, RK-I, RK Push-Pull</i> by G.I.Bakshaev</a>