Originally Posted by
JohnBurke
There is no advantage, or need, to run cabin pressure to sea level; the majority of the world's population does not live at sea level. Some world population centers are there, and eventually flights landing there will have cabin pressures matching field elevation, as is always the case; to suggest that all flights should have cabin pressure altitudes that descend to sea level, especially when the flight may never actually go to sea level, makes no sense.
There is no advantage to having to ALL flights be pressurized to Sea Level Pressure, but there is an advantage to having airplanes with that capability: Passenger comfort. Imagine flying from JFK to DXB and never feeling the effects of a pressurization system because the cabin was kept at sea level pressure the whole time....
If you'd prefer to figure out world population by cities and location, cite each one, and do the math, more power to you.
It's already been done.
How does increasing cabin pressure increase humidity?
Denser air holds more water. If you've ever owned an air compressor you would know this because the tank of an air compressor must be drained often to ensure the inside does not rust.
Why do composite aircraft have more wiring than conventional airframes?
Didn't say that they did. However most newer composite aircraft have many more electronics than their predecessors. In fact I can't think of a single one that doesn't. The 787 is the easy example, and it has far more electronics than its predecessor: the 767. Almost everything on the 787 is electric.