On Wed, May 15, 2002 at 06:24:55AM -0400, David Megginson wrote: > Now that the environment subsystem can manage its own atmosphere model > (at least up to 60,000 ft or so), I've added an option to use that > model instead of the built-in model in each FDM (the default is still > to let the FDM manage the atmosphere). If you run with > > fgfs --prop:/environment/params/control-fdm-atmosphere > > JSBSim and YASim will bypass their own atmosphere models use the > values from the environment subsystem. > > Currently, YASim seems to be working fine with this after a few lines > of code changes, but JSBSim is not. JSBSim has built-in support for > an external atmosphere, and the values seem to be getting through OK > (after removing some spurious set_* methods), but the trimming routine > gets caught in a loop. I'd be very grateful if Tony and others could > look at this and figure out what the problem might be. > > Why use an external atmosphere model at all? Of course we want to be > able to control the atmosphere rather than always flying at the > equivalent of 15 degC temperature, 28.5 inHG, and 0.00237 slugs/ft^3 > density at sea level. We could do that by providing the sea-level > defaults and letting the FDM's atmosphere models calculate the values > at altitude (it would also require a few lines of code change), but > unfortunately, the FDMs are not the only subsystems that need > atmosphere information -- we also need it for the some of the > instruments, for the engine model (which might not always be > built-into the FDM), for cabin pressurisation, and for weather reports > like the ATIS, for icing, and who knows what else. > Are there any plans for adding support for the interesting bits of weather to this model? (ie, storms, realistic winds that actually relate to the rest of the weather model, etc)
There seemed to be support for them in the CM weather stuff, and it seems a little redundant to be adding a new, less capable model when there's one already there . . . Simon -- PGP public key Id 0x144A991C, or ftp://bg77.anu.edu.au/pub/himi/himi.asc (crappy) Homepage: http://bg77.anu.edu.au doe #237 (see http://www.lemuria.org/DeCSS) My DeCSS mirror: ftp://bg77.anu.edu.au/pub/mirrors/css/
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