Holds and Speeds
hey there , well cant comment much on y is it that the v2500 series a320 hold speed is gd+20 and not so for 319/320 , but i have a therory too about wat you have to say..may be it can give us a clue about the diff in hold speeds...
well as i can recall hold speed is decided by the FMGS , its criteria is :
the hold speed is the lower of :
GD or ECON SPEED or ICAO Recommended Speed ( FAA/CAA/French CAA/ICAO) or A/c Best Endurance Speed. (Not to mention i havnt found ne explanation of wat is Best Enducance Speed) , now the A319/21 Fuel consumption may vary a bit diff from the a320 and as a result of which depending on fadec and engine interface standards the best hold speed seemed fit may be GD where as for the Older A320/v2500 series it may be gd+20 hence the diff...
open to ne correction if i might be wrong in thinkin...
I think it depends on the A/C configuration of Engine v/s FADEC stds and basic aerodynamics of each a/c design diff (ie diff bet the a319-321 family)..hope i shed some light on this topic ...