Well, I'm convinced that the balance of the aircraft doesn't change, not unless someone places a big bucket of Trill at one end of the cabin.
But does the all up weight (or mass, as JAR would properly like us to say) change if the perched parrots take off? No.
Whether the parrots are flying in the cabin or sat on the perches the All Up Mass stays the same. This is because the parrots are still inside the aircraft (the all up mass of an aircraft actually includes the mass of the air within it, therefore includes the mass of any parrot flying within said air).
Therefore Gassbag is correct. Even about the Guano.
Quad Erat Demonstrandum
cheers!
foggy.
Last edited by foghorn; 8th September 2002 at 21:22.