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sajan on Twitter: "Rear cockpit of a MiG-21 Type-69 trainer. Retractable periscope seen here has speed limitations and is auto-retracted with LG, covering 2/3 of canopy. Instructional combat sorties quite a challenge
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Those small fans in Soviet designed helicopter cockpits, are they just for air ventilation, or do they serve another purpose? - Quora
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