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I noticed there is a little offset in a seaplane's hull (highlighted in the following picture). I suppose this is useful as it exists in all the seaplanes I know. It appears to be neither a hydrodynamic nor aerodynamic feature. I could not find clue by myself as I don't know this feature's name. My question, what is its name and purpose? (wikimedia.org)
aircraft-design feature-identification fuselage seaplane
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Notts90
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