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Re: Spitfire vs 109
"While the DB 605A retained the single-stage supercharger of the DB 601, its barometrically controlled hydraulic clutch constantly adjusted the supercharger's compressor speed to different altitudes (rather than having gears for just two speeds); this made it more efficient". (p. 280)
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 author of THE DECISIVE DUEL: SPITFIRE VS 109, published by Little Brown. Visit its website at: http://Spitfirevs109.com
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