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View Full Version : Any realistic cockpit with Glide Path Angle?



Kapitan
02-06-2011, 06:56 AM
Until now Ive often prefer to fly classic analog cockpits such as 727, 747-200, L1011, DC-10s, 737-300, etc cause they are far more realistic. The analog instruments work just as expected both in real life and in the sim. The same cant be said of glass cockpits.

Those Airbus cockpits around in flightsim are very simplified, they dont have not even 40% of all the features from the original. An example, watching the Air disaster series in Natgeo I saw that Air Inter Flight A320 that crashed in France. One of the causes was a pilot error, he dial 33 in the VS indicator, instead of 3.3

The autopilot VS in real life has two modes: VS (in feet per minute), or FPA (Flight Path Angle) in degrees. The pilot switched 33 (which in the decade of the 90s read as 3300 feet per minute) instead of turning the knob to FPA and selecting 3.3 (angle of descent)

Later worlwide Airbuses changed this confusion potential mistake that took the lifes of 99 people in this crash, adding two zeros to VS feet per minute, 3300, so it cant be confused with angle 3.3 , that is confuse angles with feet per minute.

I wanted to land by non-precision approaches using the FPA in autopilot but wonder if all those paywares out there that claim to be realistic have this feature, which is actually used a lot in real landings. Do you know any freeware or payware that is a realistic autopilot? thanks.

fxsttcb
02-06-2011, 08:13 AM
As far as I can tell, there are no angle of descent or climb SDK variables available to use in a gauge.
If an accurate "FPA" is available it will have to use distance and altitude calculations to derive the error from setpoint angle.
If not near setpoint, it would have to either use trim or VS to correct the aircraft. Setting VS to correspond to angle is not as accurate as actually correcting the angle with trim.

Creating trimming PID loops is possible for those types of controls, but, in my experience speed changes and pilot input have to be near nil otherwise the loop overcorrects and severe oscillation occurs until the control is turned off. Possible issues are in the aircraft.cfg trim "effectiveness" settings which are out of the control of a gauge. I haven't been able to effectively identify and damp the oscillation condition with the gauge. Other, better, gauge programmers may have found solutions to that...Don

gandy
02-06-2011, 08:54 AM
I know the wilco/feelthere airbus will do everything for you ( as long as you program the fmc correctly ), It has the true to airbus gravity decent and powered decent so it will maintain what ever speed is set for the decent, Im not sure if it has the FPA feature as i dont fly mine that often

Kapitan
02-06-2011, 01:42 PM
OK Don, thanks for deep tech explanation...I take it as "not possible"

fxsttcb
02-06-2011, 01:45 PM
OK Don, thanks for deep tech explanation...I take it as "not possible"Maybe not for us budding freeware developers anyhow! I'm sure someone in the payware realm has a solution. Prying it out of them is a different story!...Don