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The Polikarpov I-188 was the last design to be based on the I-185, and was intended to use a smaller, lighter but less powerful engine than the original aircraft. The I-188 was developed early in 1943. The new M-90 engine had a small diameter than the M-71 engine used in the M-185, and would have reduced drag, making up for the loss in power. The I-188 never progressed beyond the design stage.