Quote:
Originally Posted by Tourigjm
turns out we would have to carry even more weight to carry water to keep everyone hydrated... this lowers efficiency  |
You need to apply a bit of creative thinking. The passengers exhale water into the air, no? And it's really cold outside at cruising altitude, so you pass the cabin air through an external condenser, which dehumidifies the air & recycles drinking water...
Now as for food, given that on average a sizeable fraction of the passengers could stand to lose some weight, extra feeding's not really needed. Indeed, you need to factor in the increased aircraft efficiency because of the passengers' weight loss during the flight :-)