Climb Speeds on Short Sectors
Can anyone please explain why, in the normal course of events (A320 Series, crz around FL350+, CI 12, mid weight) the climb IAS/Mach will be roughly 285/.77 with the usual crossover level around FL300 and yet on the short flights eg LGW/LTN/STN to AMS/CDG which are capped at FL230, the climb IAS is high - 300ish - which converts to the climb and crz Mach of .65ish at around FL180 so you end up cruising at a ridiculously low Mach No which gives an IAS of around 250-260. I understand why the ac wants to cruise at such a low IAS, but why does the FMGC want to climb at such a high IAS which it then drags back using Mach No to the required low value of IAS.
Cheers
mcdhu