TJ:

TJ:

Annexed an IVSI (instantaneous ertical speed indicator), which bypasses a
limitation with Concorde :

- the cruise at Mach 2 must be with a slow climb rate of 50/60 ft/min
  (2h from 50000 ft).
- with /velocities/vertical-speed-fpm, the real climb rate (altimeter) varies :
  One must constantly (every 5-10 minutes) change the vertical speed hold of
  the autopilot between 10 ft/min and 200 ft/min.
  This is very annoying because not a constant offset : that could be a lack of
  sensitivity of /velocities/vertical-speed-fpm (FDM ?).

This new IVSI :
- Is an emulation with works with environment pressure : a real IVSI works with
  static pressure (with lag) + accelerometers.
  It is not forbidden to later upgrade to the real model.
- Doesn't require a tuning of the autopilot made with
  /velocities/vertical-speed-fpm (also tested with 737, 747) :
    Concorde's autoland works without update.