Hi Ozzy
Ok assuming its for fs2002 or fs9
I would use the concord nose animation,I used it for my gear doors on the mirageIII and works a treat as there are no screen message

then build a xml gauge using speed and the INCREASE_CONCORDE_NOSE_VISOR
DECREASE_CONCORDE_NOSE_VISOR
have a look for a file called xmlgau01.zip by Arne Bartels
it has a heap of good info on xml gauges and events.
I'm not sure but there maybe some drag related entry's in the air file for the concord nose if not you can always model in flaps and spoilers through xml gauges.
Regards
MaV