Re: [Flightgear-devel] recent 737 autopilot change
> On Thursday 27 Oct 2005 20:20, Vassilii Khachaturov wrote: > > In the recent 737 autopilot change, > > we see that the only improvement is the change of the target > > speet. > > [snip] > Hello Vassilii, > > these aren't 'hardwired' values but defaults. The values > declared here, in the aircraft 'set' file create the > corresponding nodes in the property tree and their values can be > changed using panel instruments, GUIs, the property browser, > nasal scripts and the telnet and http interfaces. I certainly understand that one can change the property during runtime; I am definitely guilty of not reading into the aircraft model before righting the original mail in this thread. What is more, is that I missed the data/Aircraft/737/Systems 737-autopilotV4.xml update, where the actually important stuff had happened. I thus assumed that all the cure (in the log message that was common for both the changes) was in changing the above default, and hence inquired! sorry for wasting everybody's time... Vassilii ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] recent 737 autopilot change
On Thursday 27 Oct 2005 20:20, Vassilii Khachaturov wrote: > In the recent 737 autopilot change, > we see that the only improvement is the change of the target > speet. > > diff -u -2 -r1.15 -r1.16 > --- 737-set.xml 18 Oct 2005 16:32:23 - 1.15 > +++ 737-set.xml 27 Oct 2005 08:34:40 - 1.16 > @@ -110,5 +110,5 @@ > type="double">4000.0 type="double">283.0 - type="double">200.0 + type="double">165.0 > > > However, I am surprised to see that the target speed is > hardwired here. AFAIK, the heavies use different target speeds > dependant on the density altitude and aircraft landing weight. > I don't know how big the difference can be within the possible > range of the allowed landing weights. Can a 737 specialist > sched some more light, please? > > V. Hello Vassilii, these aren't 'hardwired' values but defaults. The values declared here, in the aircraft 'set' file create the corresponding nodes in the property tree and their values can be changed using panel instruments, GUIs, the property browser, nasal scripts and the telnet and http interfaces. The file that defines the characteristics of the autopilot is Aircraft/737/Systems/737-autopilot.xml If you have a look at this you'll see that the relevant autopilot PID controllers read their reference values from the property tree nodes holding the values declared in the aircraft 'set' file. LeeE ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] recent 737 autopilot change
> In the recent 737 autopilot change, > we see that the only improvement is the change of the target speet. > ... > However, I am surprised to see that the target speed is hardwired here. The autopilot for FlightGear's 737 is the "standard" FlightGear autopilot and doesn't reflect the way an actual 737 autoflight system works. I once built an autoflight system for the FlightGear 737, but gave up do to a lack of suitable controllers. It has since been erased during an OS change. The current method has some advantages: 1) no learning curve for those already using FG's autopilot 2) the code and GUI already exist 3) it makes a poor terrorist training device ...and some disadvantages: 1) the autopilot doesn't match the Mode Control Panel 2) it doesn't work like a Boeing autoflight system 3) it will forever bring complaints Dave ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
[Flightgear-devel] recent 737 autopilot change
In the recent 737 autopilot change, we see that the only improvement is the change of the target speet. diff -u -2 -r1.15 -r1.16 --- 737-set.xml 18 Oct 2005 16:32:23 - 1.15 +++ 737-set.xml 27 Oct 2005 08:34:40 - 1.16 @@ -110,5 +110,5 @@ 4000.0 283.0 -200.0 +165.0 However, I am surprised to see that the target speed is hardwired here. AFAIK, the heavies use different target speeds dependant on the density altitude and aircraft landing weight. I don't know how big the difference can be within the possible range of the allowed landing weights. Can a 737 specialist sched some more light, please? V. ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
