The two-seat I-6 Gambija of 1932 had lines in advance for the period. Note the compound sweep-back on the parasol wing. Power was a 95-h.p. Blackburn Cirrus Mk.III inverted incline.
Whilst the early Irbitis designs were high-wing monoplanes (shown, I-6), all the later aircraft were low-wing types.
The I-6 had folding wings with considerable sweep-back;
The I-8 was stressed for aerobatics and was powered by an Armstrong Siddeley "Genet" engine.