Re: [Flightgear-devel] Problems with YASim turbine engines
On Wednesday 13 April 2005 20:44, Andy Ross wrote: > Lee Elliott wrote: > > I've got two flight models in development that use the YASim > > turbine engine and [...] the fuel flow figures are of the > > order of several hundred million gallons/hour. > > There was a units bug with the default (and currently > untunable) BSFC number. Try it now and see if that makes more > sense. > > Andy Thanks - that seems to have done the trick. LeeE ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Problems with YASim turbine engines
On Wed, 13 Apr 2005 14:07:23 -0700, Andy wrote in message <[EMAIL PROTECTED]>: > Arnt Karlsen wrote: > > Andy Ross wrote: > > > There was a units bug with the default (and currently untunable) > > > BSFC number. > > > > ..could the BSFC figure be moved to the config tree? (Would allow > > modelling exotic fuels etc too.) > > I lied. You actually *can* set the fuel consumption on the turbine > engine with a "bsfc" attribute. Sorry. :) .. ;o) -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...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 Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Problems with YASim turbine engines
Arnt Karlsen wrote: > Andy Ross wrote: > > There was a units bug with the default (and currently untunable) BSFC > > number. > > ..could the BSFC figure be moved to the config tree? (Would allow > modelling exotic fuels etc too.) I lied. You actually *can* set the fuel consumption on the turbine engine with a "bsfc" attribute. Sorry. :) Andy ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Problems with YASim turbine engines
On Wed, 13 Apr 2005 12:44:14 -0700, Andy wrote in message <[EMAIL PROTECTED]>: > Lee Elliott wrote: > > I've got two flight models in development that use the YASim turbine > > engine and [...] the fuel flow figures are of the order of several > > hundred million gallons/hour. > > There was a units bug with the default (and currently untunable) BSFC > number. ..could the BSFC figure be moved to the config tree? (Would allow modelling exotic fuels etc too.) -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...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 Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Problems with YASim turbine engines
Lee Elliott wrote: > I've got two flight models in development that use the YASim turbine > engine and [...] the fuel flow figures are of the order of several > hundred million gallons/hour. There was a units bug with the default (and currently untunable) BSFC number. Try it now and see if that makes more sense. Andy ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Problems with YASim turbine engines
On Wednesday 13 April 2005 19:34, Lee Elliott wrote: > Hello all, [snip..] also ignore the remark about the fuel tanks being empty on start-up - that only happens if your throttle is even only slightly open. However, with the throttles fully closed I now notice that the fuel-flow rate is negative and is over-filling the tanks:) Did I mention that I haven't done much propeller stuff? :) LeeE ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] Problems with YASim turbine engines
On Wednesday 13 April 2005 19:34, Lee Elliott wrote: > Hello all, > > This is probably one for Andy R. > > I've got two flight models in development that use the YASim > turbine engine and although they both solve and fly reasonably > (bearing in mind that they are both pre-alpha and I've done > less than 15 minutes on each) the fuel flow figures are of the > order of several hundred million gallons/hour. No - that's > not a typo - several hundred millions of gallons per hour. > > Heh - although I said that they flew reasonably well for first > attempts I should have added that this was with empty fuel > tanks - as soon as the sim starts the tanks are drained:) > > There's a .tar.gz of the TU-114 YASim config on-line at > > http://www.overthetop.freeserve.co.uk/TU-114-yasim.tar.gz > > While there's certainly a lot of guesswork in the config I > can't see, or even imagine, anything that would lead to these > fuel-flow rates. > > The second 'problem' may not be a problem at all but just a > mis-configuration in the same TU-114 config. Although I've > included contra="1" tags I still appear to be getting prop > induced roll. > > I've also included moment tags but these are un-calculated > place holder figures until I can work some proper numbers out > but I thought that these were effectively ignored if > contra="1" was included. > > LeeE Oops - ignore the prop induced roll problem - the Right Outer engine needs a crucial '-' inserted in front of the propeller y loc - doh. LeeE ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
[Flightgear-devel] Problems with YASim turbine engines
Hello all, This is probably one for Andy R. I've got two flight models in development that use the YASim turbine engine and although they both solve and fly reasonably (bearing in mind that they are both pre-alpha and I've done less than 15 minutes on each) the fuel flow figures are of the order of several hundred million gallons/hour. No - that's not a typo - several hundred millions of gallons per hour. Heh - although I said that they flew reasonably well for first attempts I should have added that this was with empty fuel tanks - as soon as the sim starts the tanks are drained:) There's a .tar.gz of the TU-114 YASim config on-line at http://www.overthetop.freeserve.co.uk/TU-114-yasim.tar.gz While there's certainly a lot of guesswork in the config I can't see, or even imagine, anything that would lead to these fuel-flow rates. The second 'problem' may not be a problem at all but just a mis-configuration in the same TU-114 config. Although I've included contra="1" tags I still appear to be getting prop induced roll. I've also included moment tags but these are un-calculated place holder figures until I can work some proper numbers out but I thought that these were effectively ignored if contra="1" was included. LeeE ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
