Re: [Flightgear-users] Re: Spitfire Starting (was FlightGear v0.9.8onWindows XP)
Then fire the starter - it needs holding on for a couple of seconds (I'd guess you aren't holding the starter switch on for quite long enough, but it's only a guess). Use the panel switches as well as the keyboard. The keyboard's space bar is defined with a mod-up, so the starter stops when you release the key. This works fine for some airplanes, but not for others. Maybe the Spitfire can redefine the space bar binding in its *-set file? Dave ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] FGFS vs. XPLANE vs. MS Flight Simulator
-are there any glider available in FGFS? There are two here: http://www.flightgear.org/Downloads/aircraft/index.shtml The ASW-20 uses the UIUC flight dynamics model. The Schweizer 2-33 uses the JSBSim flight dynamics model, and also uses the AI system to put a thermal over the control tower at KSFO. You could also paste the thermal bits of XML from sgs233-set.xml into the asw20-set.xml file to give it a thermal too. Or, you could make thermal_demo the default AI scenario by editing the preferences.xml file. Dave ___ Flightgear-users mailing list Flightgear-users@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Fuel consumption of the A320
I think this is a good first approach. But it covers not the static thrusts condition, when the aircraft is at the airport. There must be a dependency with the airspeed. Engine performance does vary with speed, but this is done in the idle thrust table in the engine configuration file. I search for hours on the net to find some hints regarding this item. Nothing. Never mind. To have a correct fuel consumption for cruise is more important than the consumption at the airport. We just have to hurry up with take off :) Do you mean that your fuel flow at idle is not what you're expecting? Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Fuel consumption of the A320
is this something that you have/will implement in JSBSim for the turbine model? I'm not sure yet. Now that my internet connection is back up I'm trying to find out what exactly is the problem that Hans-Georg is having. I need specifics. An overview of how FGTurbine calculates thrust and fuel flow: Idle thrust is looked up in the idle thrust table, which uses speed and altitude as inputs. Full thrust (military thrust) is looked up in the milthrust table, also using speed and altitude as inputs. Idle thrust is subtracted from this here. It is added back in later. N1 and N2 targets are based on the throttle position and the idle N1 and idle N2 values from the configuration file. A function called Seek() acts as a lag filter to spin the engine to the target N1 and N2 realisticaly. A value called N2norm is found. This is just the N2 range (from idle N2 to maximum N2) normalized. A thrust coefficient is found, ... Oops, that's not my code. It looks like we're getting thrust squared? I'll fix it. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Fuel consumption of the A320
May be it is a good idea to meet the published TSFC values at cruise speed (N1 about 80 or 85 %), not at N1=100 % That's a good idea. We can assume that most TSFC values will be given for cruise conditions, about 80 to 85 percent N1. The turbine model uses N2, only because it has to also make sense for turbojets. This formula looks better: correctedTSFC = TSFC * (1.5 - (N2norm * 0.58823)); This will make the TSFC value just right at 85% N2. It also flattens the curve a bit which will result in less variation over the range of N2. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Fuel consumption of the A320
Is this behaviour a bug or a feature ? Where is the fuel consumption calculated ? It's in FGTurbine.cpp: double correctedTSFC = TSFC + TSFC - (N2norm * TSFC); FuelFlow_pph = Seek(FuelFlow_pph, thrust * correctedTSFC, 1000.0, 10); The published TSFC value is usually for cruise conditions, so I've made it vary with N2 to better model fuel flows at low N2, where the compressor is inefficient. I matched the results with known fuel flow values for the CFM-56, and the results are pretty good. Do you have a better formula to vary TSFC? If so let's get it into the model. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Flyable aircraft
You CAN help. Can you start by describing the flight condition that leads to the yaw oscillation? I'll need to reproduce this same flight condition so I can see what's happening first. I'm speaking from near-ignorance because I have zero experience with transport jets, but don't they often have a lot of yaw oscillation? I thought that was why the yaw-damper was always on, even when the pilot was hand-flying. Once on the radio, I did hear a big jet (don't remember the type) declare an emergency and return to the airport because it lost its yaw damper. All of the ones I'm familiar with need a yaw damper, but they'll fly adequately without one. If the yaw damper quits enroute you can continue as long as you avoid certain flight regimes as specified in the flight manual. Of course there may be exceptions. It usually more of a problem at high altitude, which makes me wonder if that big jet's main problem was that it didn't have enough fuel to get to it's destination at the restricted altitude, so they called the flight off and declared the emergency for a very overweight landing. But that's just a wild guess :) Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Flyable aircraft
I see that too. The condition is nothing special actually. Just fly level and try a left turn. In my case, the nose will first go the right and then the aircraft will start turning left. Almost like the left bank caused a right rudder reaction for a while. I can't reproduce that. Can you send me the 737.xml file you're using so I can compare it with mine? Thanks, Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Ground speed of 737
when I fly with the 737 with 3 x 8400 lb in the tanks at 1 ft with N1 = 80,4 %, then the Ground speed GS = 450 KT. When the tanks are nearly empty (3 x 1000 lb) the ground speed GS is only 400 KT. Where both test runs done using the same magnetic heading? Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] Missing objects
I just upgraded to 0.9.5 and soon discovered that the sailboat and aircraft carrier are missing (KSFO). Will they return, or is there a magic incantation to perform? Also.. I was sitting just off the runway with some horn blowing in my ear, when all of a sudden another plane landed. Whoosh, right past me. Is more of that possible? The aircraft carrier was part of the scenery, so perhaps it has been removed from there? The sailboat and aircraft (was it a 737?) are both AI objects, which are controlled by an AI scenario file. You can find this file in the data/Data/AI/ directory. You probably had the aircraft_demo.xml file loaded in preferences.xml. You can have as many AI objects as you like, so you can create your own AI scenario file and load it up with objects. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-users] 737 ?????
Hi Guys Having download the current CVS last night I decided to take the 737 for a spin to see how it worked since it left my hangar for the big wide world.But the autopilot panel would not appear to work at all.I know that work has been done in this area so how do I get the autopilot/autothrottle to work.As it stands now the readme I wrote is not worth the paper/BITS it is written on. This is really a question for David Culp (who is away for a few days at the moment) and I didn't try the autopilot of the 737. But this is the latest version available. I started working on a new autopilot for the 737 as soon as the new code came out, but I was also making changes to the code. I dropped it until the code stabilized. I'll try to get a new autopilot made for the 737 before the next release. Dave -- David Culp davidculp2[at]comcast.net ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] Re: airfields in United Kingdom
I can't get the engines to run properly on the T6texan, OV10 and T38 even when starting with engines running. What do the engines do, or not do? Dave -- David Culp davidculp2[at]comcast.net ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] Frame Rates and general performance questions
It's like you have to compensate *constantly* to keep it on track. The one time I've been in the copilots seat in a real plane, the pilot didn't have to move the yoke or pedals around to get and keep the plane lined up with the runway anywhere NEAR as much as you have to in jsb. Try doing an approach in yasim and you'll see what I mean. This is also the same basic difference I noticed between JSB and FS2004. You have to keep constant right rudder in at high power settings, due to torque effects. This is very tough to do with a joystick twist-rudder, and results in sloppy heading control. Dave -- David Culp davidculp2[at]comcast.net ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] Low Rider effect
SMF (--airport=KSMF) but I get a very disturbing rocking or bouncing effect (like a low rider) This is with the brakes on and the throttle at idle. In one case, the effect was so bad Which airplane and FDM? Dave David Culp davidculp2[at]comcast.net ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] Scernery Files
I downloaded the scernery files w080n40 and w090n40 and when I open the air ports im always on water. I use Flight Gear v0.9.3. im new to this game and I just want to knowif the is a solution for this. What operating system do you use? What command do you use to specify the airport? Dave -- David Culp davidculp2[at]comcast.net ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] Simulator screenshots
If you have a number of screen shots of your favorite flight simulator to share, now is your time to post them here: http://simscreens.net/ Here's one I added of an AI KC-135 orbiting over Los Angeles at 10,000 feet. Rendezvous with the JSBSim T-38. http://home.comcast.net/~davidculp2/refueling.jpg Dave -- David Culp davidculp2[at]comcast.net ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] Simulator screenshots
Might this get into FG soon? I could, except I don't know if I can find the model's original authors to get it GPL'd. It's a low-poly design for FS95 by Dale Jackson. An in-flight refuelling sub-system/facility would be... :) That's what started me down this road, but I don't know... maybe :) Does it use the 'KEMT' type AI or is it a multiplayer technique, and is there much jitter? It's derived from Dave Luff's FGAIPlane, and is instantiated by the FGAIMgr along with the C-172 at KEMT. It starts 6 miles east of KEMT, heading north at 10,000 feet, and just flies a 15-degree-bank left turn all day at 350 KTAS (just over 300 KIAS). You can see jitter as you get within about 500 feet or so. I figure that even with a 120 hz refresh it would jump 5 feet forward between updates. In this shot I have a frame rate of 20, so the jumps were pretty far. I had to crank the visibility up so I could find the stupid tanker :) Maybe Erik's F-16 can get it on radar. Dave -- David Culp davidculp2[at]comcast.net ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
[Flightgear-users] Aero-Matic update
Version 0.4 of Aero-Matic is out now, and includes a new aircraft category, Multi-Engine Prop Transport, which will provide a configuration file for airplanes such as the Beech 1900, B-17, Fokker 50, etc. If you don't enter a wing area for your airplane, Aero-Matic will guess one based on an estimated 57 lb/sq-ft wing loading for this category. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] UIUC Planes
How may I start FGFS with these aircrafts? I have run $ fgfs --aircraft- dir=/FGroot/data/Aircraft-uiuc/TwinOtter, as example, but FGFS always start with C-172. for Beech 99, for example, use: fgfs --aircraft=beech99-v1-uiuc In general, look in the $FGROOT/Aircraft directory and use the name of the *-set.xml file for the aircraft, but leave out the -set.xml part. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users
Re: [Flightgear-users] Flyable aircraft
The 737 is a really nice piece of work but the FDM needs a little tweaking. It gets into a strange yaw oscillation under nearly any circumstance that gets really annoying after a few minutes. :) I really wish I could help out with some of the aircraft but getting info is really difficult and working on FDM's is way past my ability and intelligence. You CAN help. Can you start by describing the flight condition that leads to the yaw oscillation? I'll need to reproduce this same flight condition so I can see what's happening first. Right now I don't see the oscillation. Dave -- David Culp [EMAIL PROTECTED] ___ Flightgear-users mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-users 2f585eeea02e2c79d7b1d8c4963bae2d
