On Wednesday 22 Jun 2005 12:27 am IST, Curtis L. Olson wrote: CL> Kitts wrote: CL> CL> >PIO's? CL> > CL> > CL> CL> Pilot induced oscillations ...
Oh! ok. Yeah this happens all the time when i use the keyboard in the simulator! :-) CL> >CL> I would just run with --fdm=null and pass in the CL> >CL> data that you do have. Optionally you can compute estimates for things CL> >CL> you don't have just to make the display prettier. CL> > CL> >Optionally i can compute? How? Is it not the FDM that does all that CL> >computation? CL> > CL> > CL> CL> The thing you have to remember about the FDM's is that they are self CL> contained units that maintain their own internal state. They aren't CL> setup to have their internal values overridden by an external source, CL> and there are issues and problems doing that. For instance if you CL> estimate some sequence of positions over a second or two, but you were CL> hit with a gust and ended up a long ways off from the estimate, now you CL> plug those new values into the FDM, it sees a huge distance travelled CL> compaired to the estimate in a very short time frame, and might generate CL> huge forces that could ripple through the future calculates and throw CL> your estimates off even further. CL> CL> You almost need a way to check point the calculations so you can backup CL> to the last known good value when your next good data arrives. CL> CL> It's not trivial, there are a ton of pitfalls, and our FDM's aren't CL> setup to be able to do that. CL> CL> Having said that, I don't think any of these things are insurmountable, CL> and there might even be easy solutions to many of the challenges, but CL> you'd have to go dig into the flight model code with a certain level of CL> understanding of what you are doing and what you hope to accomplish CL> before you are going to have any success with this approach. Hmmm... Maybe not right away but as a future thing. For the near future ill stick to --fdm=NULL :-) CL> >I have used 3 devices till date to achieve wireless link. I have used RF CL> >modules from Linx CL> >(http://www.linxtechnologies.com/index.php?section=products&category=rf_modules&subcategory=es_series), > CL> >BIM1 modules from Radiometrix CL> >(http://www.radiometrix.co.uk/products/bim1.htm) and XStream radio modems CL> >from maxstream CL> >(http://www.maxstream.net/products/xstream/module/9xstream.php). CL> > CL> >Of the three, the maxstream module is what i currently use as it has CL> >provided me with the most reliable link and longest range. I have however, CL> >had reasonably good success with the BIM1 modules. It however requires CL> >robust error checking algorithms for reliable use. These have the advantage CL> >of being light weight and giving pretty good range. CL> > CL> > CL> CL> Where can I find a price or someone selling the maxstream module? I'm CL> must be missing the link, or do they not sell to individuals? Price is available on Digikey. Search for Xstream and follow that link <RF Transmitters/REceivers>. There are plenty of variants available in 2 frequencies. Here is one such variant http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=195594&Row=517830&Site=US -- Cheers! Kitts _______________________________________________ Flightgear-users mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
