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Message: <blockquote data-quote="Silencer1" data-source="post: 63992" data-attributes="member: 3256">Hi Bailey!Actually, first prototype of U-2 has have little common with the mass-produced version. The wings were of thick airfoyle, empennage was of rectangular shape etc. After tests all this things were alterd, and U-2 takes it;s familiar shape. So I suggest that the aircraft, demonstrated in Berlin was not first prototype, but one the later machines.<img src="http://img269.imageshack.us/img269/3382/po2jlv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Above is 1st prototype of U-2 (1927), below - series production aircraft of mid-1930th.Curious thing is that "Three friends" aircraft has been not only build by this three persons, although has a motto "Strength, simplicity and low cost - the three best friend's of Air Fleet"  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /><blockquote data-quote="Bailey">Soviet Aircraft and Aviation 1917 - 1941, Lennart Andersson, Putnams."The U-2 (Polikarpov) that was shown in October 1928 at the International Aviation Exhibition in Berlin probably was the first prototype."The same reference also identifies the other two aircraft as the "Nevdachin Burevestnik S-IV" and the "Semenov-Sutugin-Gorelov Tri Druga".</blockquote>Cheers!</blockquote>