Re: [Flightgear-users] A380 Files
On 9/29/05, Bill Galbraith [EMAIL PROTECTED] wrote: -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ampere K. Hardraade Sent: Thursday, September 29, 2005 7:41 PM To: FlightGear user discussions Subject: Re: [Flightgear-users] A380 Files On September 29, 2005 09:05 am, Bill Galbraith wrote: I built a DATCOM model for the A380, and passed it to Jon Berndt. He is probably off-line for a day to two. I'm sure he will respond when he gets a chance, updating us on the status of the A380 model. You should send in your FDM so that it can be included in the CVS. Ampere Let me check with the Chief to see what happened with that little project. Jon, you out there? Sorry, complete out of topic, but how do you build a DATCOM model for an aircraft? thanks ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] A380 Files
Quoting bass pumped [EMAIL PROTECTED]: I built a DATCOM model for the A380, and passed it to Jon Berndt. He is probably off-line for a day to two. I'm sure he will respond when he gets a chance, updating us on the status of the A380 model. You should send in your FDM so that it can be included in the CVS. Ampere Let me check with the Chief to see what happened with that little project. Jon, you out there? Sorry, complete out of topic, but how do you build a DATCOM model for an aircraft? DATCOM is a computer program for generating aerodynamic coefficients and stability derivatives based on the aircraft geometry properties. Much of the information can be obtained from a book like Jane's All The World's Aircraft, but there is also a lot of guessing involved too. Having a good (accurate) three-view drawing, you end up measuring a lot of stuff. For example, you would need to know, be able to measure, or guess at: o wing span, area, and sweep o airfoils for wing, vertical, and horizontal tail o center of gravity in three axes o geometric distances like cg to root of vertical tail, horizontal tail, etc. o control surface areas, locations, and deflections (elevator, aileron, not rudder, flaps, slats, etc.) o fuselage cross-sectional characteristics at various stations For the A380, I had no idea what the airfoil sections were, and DATCOM allows only a root and tip airfoil anyway. I guessed at something. Will the results show the 0.5% fuel efficiency that Airbus engineers worked so hard to obtain? Nope. Will it give something that isn't too bad? Yep. The work that I've done with DATCOM has yielded some pretty amazing results, at least I was amazed. I would say that it is possible to obtain results withing 2- 5% of actual flight test results, although I haven't done any specific evaluation to decided just how close it really is. With flight test data, one would go in and tweak coefficient tables to get closer results. If there isn't a flight package available from the manufacturer (like for an old aircraft), or the price is prohibitive (think in the hundreds of thousands of dollars or more) for your intended use (a free simulator like FlightGear can't afford a flight package), this is a good way to get started. I have flight test data from a couple of aircraft. One was the Cessna Citation. I checked a couple tests, and the results were impressive. I want to run all of the tests one of these days and compare the results to the flight test data. I also want to do a B737 model one of these days. All I need to do is quit my day job, throw the girlfriend out, and win the lottery ;-} (Wait, I'll keep the girlfriend, she just needs to get another job.) [Shameless promotion incoming] If you are interested in exploring the wonderful of DATCOM, you can find it on my web site www.holycows.net/datcom. Windows and Linux executables are available. If you need a model and have some money, I'd be happy to do it for you. Bill billg (at) holycows.net ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] A380 Files
Le jeudi 29 septembre 2005 à 17:02 +1200, T J a écrit : Does anybody have any finnished/updated A380 files? If so could they please send them to [EMAIL PROTECTED] The same applies for the AN-225. If this is not practicle could they please update the Flightgear CVS. Thanks. _ Find the coolest online games @ http://xtramsn.co.nz/gaming The best way for you is to subscribe to Flightgear-cvslogs You are advised of every updates which area delivered. And so you can get the very last release of your preferred aircraft. I do use it, and so i don't need to ask for any finished/update. Cheers -- Gerard ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] A380 Files
On Thursday 29 September 2005 14:56, Gerard ROBIN wrote: Le jeudi 29 septembre 2005 à 17:02 +1200, T J a écrit : Does anybody have any finnished/updated A380 files? If so could they please send them to [EMAIL PROTECTED] The same applies for the AN-225. If this is not practicle could they please update the Flightgear CVS. Thanks. The best way for you is to subscribe to Flightgear-cvslogs You are advised of every updates which area delivered. And so you can get the very last release of your preferred aircraft. I do use it, and so i don't need to ask for any finished/update. Cheers TJ You can subscribe to the CVS log mailing list here : http://mail.flightgear.org/mailman/listinfo/flightgear-cvslogs Developers will keep adding fixes and updates in their OWN time and pace. So if something is amiss in an aircraft requesting a fix isn't going to help in most cases. Things will be fixed when they get fixed. If it's a bug then by all means let us know. Feature requests and bug reports are welcome but obviously can't always be implemented soon or at all depending on the general mood of the developer. Some people have families and jobs to attend to as well and just don't have enough time to fix and implement everything. If you want you can start looking around in the aircraft directories in FlightGear and learn how to fix and add things yourself. In most cases the files are in text form and can be edited with a general purpose text editor. If you fix or add something then join the developer list and let us know and one of the core developers can check it and add it to CVS. When a developer fixes or adds something to flightgear it will be added to CVS as soon as it is ready and has been checked to see that it causes no problems. CVS contains the newest code and data and you can't get it any quicker. Developers won't keep the changes on their own hard disks unless it's a work in progress and aren't willing to submit it yet for inclusion in FlightGear. Regards Paul ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] A380 Files
On September 29, 2005 09:05 am, Bill Galbraith wrote: I built a DATCOM model for the A380, and passed it to Jon Berndt. He is probably off-line for a day to two. I'm sure he will respond when he gets a chance, updating us on the status of the A380 model. You should send in your FDM so that it can be included in the CVS. Ampere ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
RE: [Flightgear-users] A380 Files
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ampere K. Hardraade Sent: Thursday, September 29, 2005 7:41 PM To: FlightGear user discussions Subject: Re: [Flightgear-users] A380 Files On September 29, 2005 09:05 am, Bill Galbraith wrote: I built a DATCOM model for the A380, and passed it to Jon Berndt. He is probably off-line for a day to two. I'm sure he will respond when he gets a chance, updating us on the status of the A380 model. You should send in your FDM so that it can be included in the CVS. Ampere Let me check with the Chief to see what happened with that little project. Jon, you out there? ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] A380 Files
On September 29, 2005 01:02 am, T J wrote: Does anybody have any finnished/updated A380 files? If so could they please send them to [EMAIL PROTECTED] Thanks. T J, you shouldn't even have the A380 on your computer in the first place, let alone updates. The aircraft is not intended to be flown at this time. This is the reason why the A380 is NOT available for download in FlightGear's Aircrafts section. Ampere ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
