 The new aircraft was a low-wing monoplane long, with a wingspan of and an estimated take-off mass of (dry mass and had a maximum propellant load of .The D-1-A-1100 engine was capable of throttling between 400 kg and 1,100 kg and with ) of propellant, the engine could burn for almost two minutes.Working around the clock, local furniture workers were employed to build the first two prototypes (BI-1 and BI-2).