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Apr 13, 2017 at 12:52 history edited CommunityBot
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Jul 14, 2016 at 4:19 comment added sh1 If the opening of a gill is 1cm, then that's one linear metre of gill (eg., five 10cm slits on each side, but failing to specify the inlet dimensions), of some unspecified depth to give it 100% efficiency, so that and/or the speed needs scaling somewhat. I don't know what stops an animal being more extensively covered in gills -- perhaps durability in a fight? I guess using the same hole to breath and to kill things is an issue. Humans have given up a lot of their durability and compensated with intelligence and tools, so that might give merfolk some wiggle room.
Jul 13, 2016 at 20:54 comment added JDługosz I see your point: not a huge jet if the aperture is reasonably large (not a garden hose).
Jul 13, 2016 at 18:38 comment added sh1 Yes I did screw up. 1000cc/l, not 100. Should be 20cm per second (0.45mph), or equal to a relaxed pace for a diver.
Jul 13, 2016 at 18:27 comment added sh1 What's this "enormous jet"? I figure a 10cm x 10cm aperture must flow at only 2cm per second (0.045mph) to work through 120 litres per minute. A quick search suggests that's about 1/10 of a relaxed pace for a diver. Did I screw up?
Jun 5, 2016 at 13:18 answer added DrBob timeline score: 3
Jun 5, 2016 at 11:09 answer added lokimidgard timeline score: 7
Jun 5, 2016 at 10:38 history edited JDługosz CC BY-SA 3.0
added 199 characters in body
Jun 5, 2016 at 10:34 answer added Mark Ripley timeline score: 3
Jun 5, 2016 at 10:10 history asked JDługosz CC BY-SA 3.0