> > We might also need a relative-humidity property. What units should > > we use? Do the FDMs care about humidity? > > The way it would work would be similar to how you posit. You'd get a > percentage saturation from somewhere (100% in clouds or rain, 20-50% > for normal days at low altitudes near large bodies of water, 0-10% in > "deserts", and guesses for everywhere else)
Make the property be Dewpoint because that's what reporting stations use. It also makes it easier for the environment database to extrapolate through altitudes because the lapse rates are known physical properties. > Real pedants will point out that water isn't a diatomic gas like air > is, and will therefore have a different specific heat ratio. This > will, in turn, change the gamma values used for mach compression > calculations and energy transfer in the engine models. I'd be really > shocked if it actually mattered. It does, if you try using the performance calibration tables, amazingly. _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
