..in laymans terms... although this may have been posted in the old 2013 thread...
the reason the Va increases with weight, is that it's just to do with stalling speed.... it's the speed you want the aircraft to stall instead of break following a sudden control deflection..
as weight goes down, so does the stalling speed. If the Va stayed the same but weight went down, then there's the chance that a sudden maneuver would bend something instead of stall the aircraft.
Higher weight, means higher stalling speed at various loads... so Va is higher.
Lower weight, lower stalling speed at various loads.... Va is lower.
Last edited by onionabroad; 27th Feb 2020 at 07:51.