The old Alphasim model now owned by Virtavia was way too hot even for flying on WEP.
The correct speeds listed on the pilot notes manuals should be
Speeds *Note 16 *Note 17 *Note 18
----F20 w/ 2x 100 gallon external tanks –
--------------Maximum Speed
------------------------Sea Level – 332 Ktas
------------------------6000’ – 355 Ktas
------------------------18,750’ – 383 Ktas
--------------Stall Speeds
------------------------115 – 120 @ 17,000 lbs, Clean, Power Off
------------------------90 – 95 @ 17,000 lbs, Clean, Power on
------------------------130 – 135 @ 19,000 lbs, Clean, Power Off
NF21 w/ 2x 100 gallon external tanks –
-------------Maximum Speed
------------------------Sea Level – 327 Ktas
------------------------6000’ – 350 Ktas
------------------------18,750’ – 377 Ktas
--------------Stall Speeds
------------------------115 – 120 @ 17,000 lbs, Clean, Power Off
------------------------90 – 95 @ 17,000 lbs, Clean, Power on
------------------------130 – 135 @ 19,000 lbs, Clean, Power Off
F3 w/ 2x100 gallon external tanks
-------------Maximum Speed
-----------------------Sea Level – 343 Ktas
-----------------------6000’ – 366 Ktas
-----------------------18,750’ – 394 Ktas
--------------Stall Speeds
-----------------------115 – 120 @ 17,000 lbs, Clean, Power Off
-----------------------90 – 95 @ 17,000 lbs, Clean, Power on
-----------------------130 – 135 @ 19,000 lbs, Clean, Power Off
The notes refer to the documents that Tako_Kichi and I used to compile the target specs document that was put together to try and develop closer real numbers.
Needless to say documenting what was its real performance caused the Alphasim version to be put in poor light.
Its still a fine FS9 model just not an accurate flight model when it comes to speed.