This plane was derived on the base of Chernov flieing boat. Sergey Tsar'kov promised to organise Chernov flieing boat production and KUAZ (Samara aviation factory) and was given the set of documentation. He failed to fulfill the mission but built Fregate using changed drawings. The plane has 2 3-cilinder engines made in Biysk. As soon as they has 6 (!) carburators they can be controlled very hard. Plus their reliability is very low. In result the plane fly but realively bad. It's hard to predict the future of this structure especially taking into consideration that original Chernov boat is protected by patent.