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Apr 1, 2019 at 23:39 comment added Mazura Wings, arms and legs: folded; uses its elongated body with a protractable membrane vertically on its tail for swimming. Basically an eel with six appendages. Six of which only cause drag underwater, and four while in flight. And 2~4 required only for walking on land.
Apr 1, 2019 at 12:45 comment added Flater Every dragon (and bird) already has a way to retract their "membrane", because they tuck their wing in on an upwards flap and extend it on a downwards flap when they are flying. The difference in surface area (and thus force exerted) is how they are able to gain altitude. The exact same principle applies underwater. This is used by humans (e.g. breaststroke: wide when pulling your arms back, narrow when pushing your ars forward) and birds who swim underwater (as per the other answers).
Apr 1, 2019 at 7:01 history answered L.Dutch CC BY-SA 4.0