Despite several problems encountered during the boat 's trials , the design was considered satisfactory .
The Soviet government bought design , with the condition Deschimag make the suggested improvements and assist with the building of several prototypes , which it did .
Despite several problems encountered during the boat 's trials , the design was considered satisfactory and the Soviet government bought it , with the condition Deschimag make the suggested improvements and assist with the building of several prototypes , which it did .