On Thursday 09 December 2010 11:08:39 Hal V. Engel wrote: > On Thursday, December 09, 2010 09:11:39 am Curtis Olson wrote: > > On Thu, Dec 9, 2010 at 10:10 AM, Hal V. Engel <hven...@gmail.com> wrote: > > > I am going to try using the autopilot between spins and during climb > > > outs to > > > get things in a know state (wings level and so on) as things progress > > > through > > > the flight. This should allow for the state of the flight and the > > > control inputs to sync up enough to get a reliable playback. > > > > Hi Hal, > > > > This was going to be my suggestion: use various combinations of autopilot > > modes to control the flight under a variety of conditions. > > > > You may find that you need to tune some of the autopilot modes better > > than what they are by default. > > I have already tuned the autopilot some time ago since the default > autopilot was very unstable in this aircraft. The real aircraft does not > have an autopilot so it is not exposed in the cockpit. I use it primarily > as an aid for performance testing (IE. climb rates, time to altitude, speed > tests...). > > > You may find that you need to create some new specialized autopilot > > modes. > > For this probably not. > > > Armed with some well tuned autopilot modes, you can write a nasal script > > (or even an external perl/python/ruby/etc. script) that can monitor the > > flight progress, select and activate the various modes at the correct > > time, and then also mix in some open-loop control in key places as well. > > I don't think I need an automated script. I mainly need a way to setup the > aircraft in a known state (wings level, sufficient altitude, know > airspeed...) at the start of the open-loop control sequences. I think I > can do this by hand by stopping the autopilot just before the open-loop > sequences while recoding the flight data. The person requesting this is > only interested in the open loop sequences (IE. stall, spin and recovery). > I would like to provide him with a flight that has both a normal spin > (entered with power off) and a flat spin (entered with a higher power > setting) sequences. > > > I've had some moderately good success doing things like auto take off, > > auto landing (even in cross winds), scheduling flaps up/down, gear > > up/down, etc. at the proper time, even flying a standard visual pattern. > > > > Nasal gives you all the trig functions, it gives you the ability to save > > wgs84 coordinates and then compute course/distance between them, or start > > with a coordinate and project out a new coordinate at some distance and > > heading. You have access to all the wind conditions, ground track, true > > airspeed, orientation, position, velocity, etc. You can manipulate any > > and all the controls of the aircraft. You can even automatically select > > and manipulate views. > > > > Combine the core capabilities of nasal, the "sensor" data available in > > the flightgear property tree, the sophisticated multi-stage configurable > > autopilot system, the ability to manipulate anything and everything, and > > a visit to the aviation formulary web site and you can be pretty > > dangerous! > > > > Take a simple wind triangle formula combined with knowledge of true > > airspeed and ground track/speed + some well tuned autopilot stages and > > you can hit your runway touch down point within a cm or two every time > > ... even with significant winds. > > > > With a little effort, it's possible to create some neat fully automated > > demonstrations. > > > > Curt. >
It would be really, really cool if you could do this using the JSBSim internal features so it could run in stand-alone, too. :) Ron ------------------------------------------------------------------------------ Oracle to DB2 Conversion Guide: Learn learn about native support for PL/SQL, new data types, scalar functions, improved concurrency, built-in packages, OCI, SQL*Plus, data movement tools, best practices and more. http://p.sf.net/sfu/oracle-sfdev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
