Hi,
I am FO on a CL605 fleet, with a long background in aeronautical engineering. I developed an interest in desktop flight simulation at a time when Flight Simulator still was a subLogic product - let me say that this CL650 simulation is absolutely amazing!
Now, let's go to the point: regarding Vac, I noticed a mismatch between the AFM and the FMS calculation. It looks like the latter doesn't take into account the saturation which can be seen in the attached AFM table - basically, at low pressure altitudes and landing weight not too close to the maximum, Vac is always 129 KIAS; in all other cases, it looks like Vac = Vref or very close to.
I did a couple of tests both on the real FMS and with the Performance Software we use, and I (as expected) got exactly the AFM numbers, whereas the Hotstart FMS seems to always give Vac close to or equal to Vref.
Note: the AFM numbers for Approach Climb Speed look the same between 605 and 650 (and 604 as well)
Do I miss anything?