The I-15 was designed by Polikarpov.
The Polikarpov I-15 got its nickname, "Chaika" from the gull wings. Some pilots disliked them as they didn't proved a very good view.
The I-15s fuselage was made from KhMA gas welded tubes with light alloy skin panels that could be removed. Behind the windscreen the I-15 was covered in fabric.
Early models used the original American engines, but the rest were Soviet licensed built Wright Cyclone M-25.
The legs slid up and down into the upper portion through an internal slot.