This is much more helpful than just a 'its unrealistic' and leave it at that. I,ve been testing some changes , it does tend to lift fairly early , but I think Ive got it a little closer now.I,ve so noticed a fuel.nas error at startup , so I'll tackle that one too. Thanks for the feedback guys.I'm currently on night shift which mean work,eat,sleep without much time in between for anything else , but should be able to fix this by the weekend. Cheers
On Tue, Feb 22, 2011 at 5:30 PM, Andy Ross <a...@plausible.org> wrote: > On 02/22/2011 04:09 PM, Ryan M wrote: >> I am not a 777 pilot in real life, but I certainly agree with Jack that >> the FDM seems unrealistic to the casual pilot. > > For those interested (Curt made me look at a YASim file last week for > the first time in over a year, so my head happened to be in the right > place), I took a peek at why this would be: > > The 777-200 configuration I see in HEAD on gitorious has an approach > setting that says it can stay in the air with 7 degrees of AoA (about > half of the available lift) at 120 kts with 80% of its fuel and a full > load. That strikes me as more than a little optimistic. This is a long haul > jet, its fuel is a big fraction of its maximum weight, and typical > landings for jet like this are made at what, 15% fuel or less? (It > can stay in the air for 11 hours, and you only need 45 minutes of > reserve fuel, right?) > > So some quick math says that if you take this aircraft which can > produce 1G at 120kias and reduce its mass by a factor of 1.74x by > dropping the passengers and using 10% fuel, and pull it up to a stall > AoA, you'll get 3G of acceleration. Speed up to just 207 kias, and > you can pull 9G in this plane. Yeah, that's a fighter jet. > > I'd suggest 131 kts (which matches the landing speed in the coments) > and 10% fuel and see how that works. > > Andy > > > ------------------------------------------------------------------------------ > Free Software Download: Index, Search & Analyze Logs and other IT data in > Real-Time with Splunk. Collect, index and harness all the fast moving IT data > generated by your applications, servers and devices whether physical, virtual > or in the cloud. Deliver compliance at lower cost and gain new business > insights. http://p.sf.net/sfu/splunk-dev2dev > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
