[Andy Fletcher]

Off topic but for those who are interested.

Here are a few more designations for MiG-1/3 derivatives/prototypes.

I-211(E): MiG-3 M-82 (or MiG-9) fitted with boosted M-82 engine
I-230(D): MiG-3U fitted with 2 x ShVAK 20mm
I-231(2D): MiG-3 fitted with AM-38F high altitude engine
I-220(A): MiG-3 fitted with AM-39 and 4 x ShVAK 20mm

Andy Fletcher