[Flightgear-devel] DC-3 crash fixed
Curtis L. Olson wrote: actually my guess is that due to the gear problem, it probably crashes instantly so nothing will work at all with it. Yup, that was it. Sorry, I've been ignoring this one. I recently changed the default gear spring strength. But taildraggers have different c.g. configurations, and the aircraft was falling through the ground on initialization. Fixed. And of course, in air starts don't work for YAsim models, so... :-) Andy, I'd be happy if we were forced to specify velocity in kts (and then maybe mach for the faster aircraft.) The units don't really matter. I can convert between them just fine. What I'm confused by is the API for how to tell which units are being used. JSBSim does this in FGInitialConditions, but I got a little lost trying to figure out where the information there comes from. Andy -- Andrew J. RossNextBus Information Systems Senior Software Engineer Emeryville, CA [EMAIL PROTECTED] http://www.nextbus.com Men go crazy in conflagrations. They only get better one by one. - Sting (misquoted) ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] DC-3 crash fixed
On Sat, 2002-12-21 at 10:52, Andy Ross wrote: Curtis L. Olson wrote: actually my guess is that due to the gear problem, it probably crashes instantly so nothing will work at all with it. Yup, that was it. Sorry, I've been ignoring this one. I recently changed the default gear spring strength. But taildraggers have different c.g. configurations, and the aircraft was falling through the ground on initialization. Fixed. And of course, in air starts don't work for YAsim models, so... :-) Andy, I'd be happy if we were forced to specify velocity in kts (and then maybe mach for the faster aircraft.) The units don't really matter. I can convert between them just fine. What I'm confused by is the API for how to tell which units are being used. JSBSim does this in FGInitialConditions, but I got a little lost trying to figure out where the information there comes from. Which information? Andy -- Tony Peden [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] DC-3 crash fixed
Tony Peden writes: The units don't really matter. I can convert between them just fine. What I'm confused by is the API for how to tell which units are being used. JSBSim does this in FGInitialConditions, but I got a little lost trying to figure out where the information there comes from. Which information? He means which velocity is normative. Andy, you can just stick with properties and look at /sim/startup/speed-set to find out which speed to use: 'knots' - get the calibrated airspeed from /velocities/airspeed-kt (kcas would be a better value here) 'UVW' - get the local velocities from /velocities/uBody-fps, /velocities/vBody-fps, and /velocities/wBody-fps 'NED' - get the NED velocities from /velocities/speed-north-fps, /velocities/speed-east-fps, and /velocities/speed-down-fps 'mach' - get the current mach number from /velocities/mach I make no attempt to justify this system, much less to claim that it's elegant, but it does work. You should also look at the /sim/startup/onground and /sim/startup/trim properties to see how you should set up the plane. If the trim property is true, Tony always trims the plane to a steady state for JSBSim, and people will assume that the same will work with YASim. 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
