Since YASim uses the atmosphere model from FGEnvironment (in JSBSim, it's always 15degC and 29.92inHG at sea level), I tried some experiments with different settings from KSFO:
1. Sea level 35degC, 28.5inHG The C172 barely climbs out of ground effect, and eventually manages an anemic 200-300fpm climb at 70 KIAS (it's very easy to get stuck in ground effect if you're not careful). 2. Sea level -25degC, 32inHG The C172 finishes the takeoff roll in seconds and shoots up like a rocket at over 1500fpm at 70 KIAS. These are the right types of effects, but I think that the magnitudes are a little excessive, at least for a sea-level airfield. I wonder if it's because I'm not changing the air density with the other values, or because YASim's solver is a little off. Anyway, it's impressive that this stuff is working at all -- good stuff, Andy. I have to figure out why JSBSim doesn't want to work with the external atmosphere model now. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
