The ROM-2 (ROM = Razviedchik Otkrytovo Morya [Open Sea Reconnaissance]) was a long range maritime reconnaissance sesquiplane flying boat with the engines arranged in tractor form in two separate nacelles.
As a result, payload (including fuel) almost doubled, and other parameters were improved Test flights began in the summer of 1929, and the ROM-2 had much better performance than the ROM-1, but those performance results were unsatisfactory for the 1930s.
Testing ended after a rough landing on one flight.
Modifications were undertaken to the airframe, with the hull shortened by 0.2m, the engines raised above the wing on short N-struts, and the aircraft was redesignated ROM-2bis, but the aircraft never flew in this configuration.
[1] Data from [2]General characteristics Performance Armament