On Monday 25 April 2011 12:10:26 Hal V. Engel wrote: snip > The supercharger model used by JSBSim assumes a turbo charger so the power > and fuel consuption curves are incorrect for an engine driven supercharger > where more horse power (and fuel) are used to drive the supercharger.
The supercharger in JSBSim is not very good, but it is engine driven in that the pressure directly varies with engine RPM unlike a turbocharger which varies with mass flow rate and exhaust temperature. The model just does not consume any power. At some point I would like to add a <supercharger> and <turbocharger> ability or add functionality to simulate an arbitrary boost device... > Using functions to set VE and BSFC at runtime gives you a way to get fuel > consumption and power curves close to correct but it does take a lot of > effort to get these functions tuned. > > snip snip > this should be fairly easy to setup > since you would only need to do some tuning to figure out the > cooling-factor for the closed and open cowl flaps and then write a simple > function to vary the cooling-factor with the clowl flap control position. Learning to use JSBSim stand-alone greatly simplifies this kind of tuning. It allows you to make multiple, identical runs while varying only a single variable at a time. Ron ------------------------------------------------------------------------------ WhatsUp Gold - Download Free Network Management Software The most intuitive, comprehensive, and cost-effective network management toolset available today. Delivers lowest initial acquisition cost and overall TCO of any competing solution. http://p.sf.net/sfu/whatsupgold-sd _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
