[Flightgear-devel] 747-400 cruise information
I asked a 747-400 pilot what was the fuel flow per engine at cruise. He said about 6000 lb-per-hour. Assuming a TSFC of 0.5 (I've seen 0.318 and 0.348 for the PW4060, but I don't trust these numbers) that would mean each engine is developing 12000 pounds of thrust. Therefore the total drag on the airplane at cruise is 48000 pounds, and total fuel flow is 24000 pph. These are very approximate numbers, but they might help locate the fuel burn problem with the Yasim 747 model. The pilot said he would take some notes on the next flight and email the numbers to me, so we'll have better data to go on (although I think we still have to guess the TSFC). Dave Culp ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] 747-400 cruise information
I asked a 747-400 pilot what was the fuel flow per engine at cruise. He said about 6000 lb-per-hour. Assuming a TSFC of 0.5 (I've seen 0.318 and 0.348 for the PW4060, but I don't trust these numbers) that would mean each engine is developing 12000 pounds of thrust. Therefore the total drag on the airplane at cruise is 48000 pounds, and total fuel flow is 24000 pph. Well. The YaSim model seems to burn something like 2000-4000 GALLONS per hour (depending on altitude and weight) during normal cruise (33000ft) per engine. Go figure. Andras === Major Andras e-mail: [EMAIL PROTECTED] www:http://andras.webhop.org/ === ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] 747-400 cruise information
David Culp wrote: I asked a 747-400 pilot what was the fuel flow per engine at cruise. He said about 6000 lb-per-hour. Assuming a TSFC of 0.5 (I've seen 0.318 and 0.348 for the PW4060, but I don't trust these numbers) that would mean each engine is developing 12000 pounds of thrust. Therefore the total drag on the airplane at cruise is 48000 pounds, and total fuel flow is 24000 pph. These are very approximate numbers, but they might help locate the fuel burn problem with the Yasim 747 model. The pilot said he would take some notes on the next flight and email the numbers to me, so we'll have better data to go on (although I think we still have to guess the TSFC). You can find the numbers here:http://www.bh.com/companions/034074152X/appendices/data-b/table-2/default.htm Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] Metakit update
You may recall me (and other Cygwin users) having problems compiling Metakit for some time. These were the issues: (i) I had to specify --with-tcl=no (no big deal), (ii) I had to eleminate 30 lines of code from strings.cpp which would not compile (ugly). I contacted the author Jean-Claude Wippler about that and got an immediate reply. He suggested an update to the current version 2.4.9.1. As he states, version 2.4.3 which we provide with SimGear had some serious flaws. I downloaded the recent version 2.4.9.1 from http://www.equi4.com/metakit/ and tried to build it (Cygwin, GCC3.2) and, voila, both problems are gone. Moreover, I re-build all FlightGear on top of it and don't observe anything wrong. As a result, could we provide this recent version with Simgear? Thanks, Michael -- Michael Basler, Jena, Germany [EMAIL PROTECTED] http://www.geocities.com/pmb.geo/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] nurbs surfaces
Has anyone here ever played with nurbs surfaces? Let's say I want to fit a nurbs surface through a regular grid of points (x,y,height). I've poked around at nurbs++ (libnurbs.sf.net) but there is scant documentation on surfaces. Thanks, Curt. -- Curtis Olson IVLab / HumanFIRST Program FlightGear Project Twin Cities[EMAIL PROTECTED] [EMAIL PROTECTED] Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] CVS make error
Hello, Trying to compile the CVS release, I run into this error Anyone have any suggestions? Need more Info? g++ -DHAVE_CONFIG_H -I. -I. -I../../../src/Include -I../../.. -I../../../src -I/usr/X11R6/include -Wall -c ExternalPipe.cxx ExternalPipe.cxx: In constructor `FGExternalPipe::FGExternalPipe(double, std::basic_stringchar, std::char_traitschar, std::allocatorchar )': ExternalPipe.cxx:49: `cout' undeclared (first use this function) ExternalPipe.cxx:49: (Each undeclared identifier is reported only once for each function it appears in.) make[3]: *** [ExternalPipe.o] Error 1 Thanks Chris Tulloch ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] 2D Panel Instrument Change
I've made a change to the switch layer type that is very useful but also, unfortunately, backwards-incompatible (I've updated all of the instruments currently in the base package). In its old version, the switch layer looked like this: layer typeswitch/type property/foo/bar/property layer ... /layer layer ... /layer /layer If the /foo/bar property had a true boolean value, the first child layer would be used; otherwise, the second would be used. In the new version, the switch layer looks like this: layer typeswitch/type layer condition ... /condition ... /layer !-- repeat as many times as needed -- layer ... /layer /layer The first layer with a true condition gets used, no matter how many layers there are. This approach allows for simpler and more elegant tests in animating 2D instruments. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] FGTransmissionList
I'm getting a build error for FlightGear with the newest stuff from CVS. Any clues? Jon g++ -DHAVE_CONFIG_H -I. -I. -I../../src/Include -I../.. -I../../src -c -o transmissionlist.o `test -fcho './'`transmissionlist.cxx transmissionlist.cxx: In method `class string FGTransmissionList::gen_text(const int , TransCode, const T transmissionlist.cxx:209: passing `char (*)[4]' as argument 2 of `bcopy(const char *, char *, unsigned int make[2]: *** [transmissionlist.o] Error 1 smime.p7s Description: S/MIME cryptographic signature
Re: [Flightgear-devel] nurbs surfaces
Hi, A good place to search is at www.gamedev.net They have just about everything on that site Kind Regards Danie Heath Software Integrator RisC Com cc [EMAIL PROTECTED] http://www.risccom.co.za Has anyone here ever played with nurbs surfaces? Let's say I want to fit a nurbs surface through a regular grid of points (x,y,height). I've poked around at nurbs++ (libnurbs.sf.net) but there is scant documentation on surfaces. Thanks, Curt. -- Curtis Olson IVLab / HumanFIRST Program FlightGear Project Twin Cities[EMAIL PROTECTED] [EMAIL PROTECTED] Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
