Re: [Flightgear-devel] SI vs Imperial
On Thu, 16 May 2002 11:58:23 +0200, Martin Dressler <[EMAIL PROTECTED]> wrote in message <[EMAIL PROTECTED]>: > On Thu 16. May 2002 00:51, you wrote: > > ..does anyone use metric flight instruments anymore? > > The only ones I know of, were the WWII Luftwaffe and the > > Warsaw Pact Air Forces and "hang-arounds", possibly also > > the Communist Chinese AF. AFAIK, none of these were strictly > > SI metric. > > All Instruments in czech ( yes this was the old comunist country :-) > are in SI only sometimes feets for altimeter are used. > I ask one pilot, and he said me that the standard will be SI-metric ..sure? I have seen altimeter calibration done in weird mixes like from 29inHg, thru metric 760mmHg, 1013mmBar, 1013 hPa and the SI 101.3 kPa. > (at least for pressure and temperature) > and feets for alt, because it gives better airspace division to FL. ..spacing by 500 meters and 1 km rather than 1000 feet and 2000 feet? ..plenty airspace, the plug in the system is the verbal communication between the overworked rap artists trying to control traffic, and the (often foreign) pilots flying blindfolded, without an intuitive view of the (mostly IFR) traffic in faraway places. They _are_ damned good at it. -- ..med vennlig hilsen = with Kind Regards from Arnt... ;-) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] SI vs Imperial
On Thu 16. May 2002 00:51, you wrote: > ..does anyone use metric flight instruments anymore? > The only ones I know of, were the WWII Luftwaffe and the > Warsaw Pact Air Forces and "hang-arounds", possibly also > the Communist Chinese AF. AFAIK, none of these were strictly > SI metric. All Instruments in czech ( yes this was the old comunist country :-) are in SI only sometimes feets for altimeter are used. I ask one pilot, and he said me that the standard will be SI-metric (at least for pressure and temperature) and feets for alt, because it gives better airspace division to FL. Madr -- Martin Dressler e-mail: [EMAIL PROTECTED] http://www.musicabona.com/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] SI vs Imperial
On Thu, 16 May 2002 08:26:15 +1000, David Findlay <[EMAIL PROTECTED]> wrote in message <200205152226.g4FMQHoN009406@tornado>: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > > As far as the SI vs. English units go, I restate my declared > > neutrality. While doing calculations *in* SI units is much safer > > and easier, I also see the advantages to representing them > > externally in traditional units. Typical (North American, anyway) > > altimeters still report feet, VSI indicators read in fpm, etc... > > Panel authors are in a poorer position to do the conversion than the > > FDM folks are. > > The easiest way to fix this is to have a properly > > /sim/metricorimperial. > > If set to 1 all values will magicly turn from imperial to metric. if > set to 0 they will all magically turn to imperial, no matter what they > were entered in. Could this be done? Thanks, ..a possibly wiser name could be '/sim/SI-metric-or-standard-english-units'. These 'standard' units are not neccesarily Imperial, some are American, AFAIK. ..does anyone use metric flight instruments anymore? The only ones I know of, were the WWII Luftwaffe and the Warsaw Pact Air Forces and "hang-arounds", possibly also the Communist Chinese AF. AFAIK, none of these were strictly SI metric. -- ..med vennlig hilsen = with Kind Regards from Arnt... ;-) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] SI vs Imperial
David Findlay wrote: > > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > > As far as the SI vs. English units go, I restate my declared > > neutrality. While doing calculations *in* SI units is much safer and > > easier, I also see the advantages to representing them externally in > > traditional units. Typical (North American, anyway) altimeters still > > report feet, VSI indicators read in fpm, etc... Panel authors are in > > a poorer position to do the conversion than the FDM folks are. > > The easiest way to fix this is to have a properly > > /sim/metricorimperial. > > If set to 1 all values will magicly turn from imperial to metric. if set to 0 > they will all magically turn to imperial, no matter what they were entered > in. Could this be done? Thanks, We might be able to create such a logic, but IMHO too much depends on it. Every part of the code that uses these properties would have to check /sim/metricorimperial and convert the data itself. I think it could be better to add an adition "subdirectory" to each property, e.g. /environment/wind/mps /environment/wind/fps /environment/wind/knots The environment code sets only one of these and the property logic dynamically creates the other ones when they get requested. The benefit is that only those conversions are done that need to be done. This should be good for performance. But I don't know if the gneral overhed would eat up all performace gains and generate a performance loss in the end. CU, Christian -- The idea is to die young as late as possible.-- Ashley Montague Whoever that is/was; (c) by Douglas Adams would have been better... ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
[Flightgear-devel] SI vs Imperial
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 > As far as the SI vs. English units go, I restate my declared > neutrality. While doing calculations *in* SI units is much safer and > easier, I also see the advantages to representing them externally in > traditional units. Typical (North American, anyway) altimeters still > report feet, VSI indicators read in fpm, etc... Panel authors are in > a poorer position to do the conversion than the FDM folks are. The easiest way to fix this is to have a properly /sim/metricorimperial. If set to 1 all values will magicly turn from imperial to metric. if set to 0 they will all magically turn to imperial, no matter what they were entered in. Could this be done? Thanks, David -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE84uCHx58m2d272NoRApjbAJ48WGcokFJ9lB316I0udGNlD6yk7QCfRykN Q2SDV3Dd14fyPQdOn8wqKNs= =94lP -END PGP SIGNATURE- ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
