Re: [Flightgear-devel] problems experienced with the recent c150 updates
Vassilii Khachaturov wrote: I've tried out the recent c150 updates, and have observed the following problems: 1) the speeds in the help file and on the specially crafted ASI seem different from what the real Cessnas have. C150 was an inferior version to a C152, with all the speeds lower, and same size tanks. Here's what a 1985 C152 book says: 108 rated BHP @ 2550 RPM 2x13gal tanks, 24.5 gal usable -- std tanks 2x19.5gal tanks, 37.5 gal usable -- long-range tanks You are right, for some unknown reason to me I changed the tanks capacity. max gross ramp weight (taxi) 1675lbs MGTOW: 1670 MG landing weight: same wing loading: 10.5 lbs/sq.ft power loading: 15.5 lbs/hp Speeds: KCASKIAS V_NE145 149 V_NO108 111 [EMAIL PROTECTED]: @1670 101 104 @1500 96 98 @1350 91 93 V_FE87 85 Hence the ASI markings are: white arc 35-85 Green: 40-111 Yellow: 111-149 and the red line is 149KIAS. But the ASI markings and the help file gives MPH not knots. To be exact the asi has primary markings in MPH and a secondary markings in Knots in the middle. 2) whenever I ask to reposition the aircraft, fgfs sometime freezes with the splashscreen on, and sometimes reports a crash as follows: Position for KSFO is (-122.383, 37.621) Crash: Attempted to fly under ground. Playing audio after 500.867 sec: intense ground contact (this is in response to a 'location on the ground' command, 28R @ KSFO) Sometimes at the same time I also see the aircraft tumbling backwards and having its tail going underground, controls held neutral, tailwind never exceeding 7 knots. Could this be that the model doesn't account for the pilot's weight? Yes I should add the pilot's weight, the aircraft is too light and can be blown away by very little wind. You should disable metar / 3) in the cockpit view, I see strange speckles around the yokes, which keep moving; you may get the idea by looking at a (still) image at http://www.tarunz.org/~vassilii/Images/fg/c150-speckles.jpg I don't know from where this comes. I've just made a check in 800x600 but I can't see that problem here. The texture used by the yoke is also used for the cabin interior, do you have the problem only for the yoke ? Harald. ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] problems experienced with the recent c150 updates
Vassilii Khachaturov wrote: I've tried out the recent c150 updates, and have observed the following problems: Here's the data for the C-150: http://www.a1.nl/~ehofman/fgfs/docs/c150.txt Erik ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] problems experienced with the recent c150 updates
You are right, for some unknown reason to me I changed the tanks capacity. I wonder if this, along with the empty pilot seat, added to the back-tumbling? BTW, Erik's data at http://www.a1.nl/~ehofman/fgfs/docs/c150.txt also lists a std and long-range configuration (please ignore my c152 data as his looks more c150-specific and complete); maybe you could add a switch to select one of the 2 to your configuration dialog? It would need an update to the fuel gauges as well. Hence the ASI markings are: white arc 35-85 Green: 40-111 Yellow: 111-149 and the red line is 149KIAS. But the ASI markings and the help file gives MPH not knots. To be exact the asi has primary markings in MPH and a secondary markings in Knots in the middle. oops. Sorry about that! This explains another thing that puzzled me -- that at 60 KIAS it was on the verge of a stall, and that climb performance was so different at 65 KIAS from what I expected :-) actually these were much slower speeds than that... 2) whenever I ask to reposition the aircraft, fgfs sometime freezes with the splashscreen on, and sometimes reports a crash as follows: Position for KSFO is (-122.383, 37.621) Crash: Attempted to fly under ground. Playing audio after 500.867 sec: intense ground contact (this is in response to a 'location on the ground' command, 28R @ KSFO) Sometimes at the same time I also see the aircraft tumbling backwards and having its tail going underground, controls held neutral, tailwind never exceeding 7 knots. Could this be that the model doesn't account for the pilot's weight? Yes I should add the pilot's weight, the aircraft is too light and can be blown away by very little wind. You should disable metar / H even an empty aircraft doesn't get blown away that easy. I can't believe it will be blown away by anything under 15 knots, especially with the brakes engaged. Also, the behaviour described above seems buggy anyhow --- why should anything become stuck? 3) in the cockpit view, I see strange speckles around the yokes, which keep moving; you may get the idea by looking at a (still) image at http://www.tarunz.org/~vassilii/Images/fg/c150-speckles.jpg I don't know from where this comes. I've just made a check in 800x600 but I can't see that problem here. The texture used by the yoke is also used for the cabin interior, do you have the problem only for the yoke ? Yes. All the way to the yoke root, bvut not the grey axis. The speckles seem to be consistent with the 10Hz timer in the .nas file. If I pause the sim, they freeze, unless I try to rotate the view. Another comment wrt the cessna is that, in the cold start scenario, you seem to simulate its configuration after the shutdown checklist had been run. However, this means that the carb heat is left off. Also, you seem to have no hotspots on the master switch, which makes it difficult to engage it (other than going to the property manager). Finally, even with the Master off, the ADF seems to be lit up. Other than those, I haven't found any flaws. Great aircraft model, and of special significance to me since I learned to fly in a 152. V. ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
Re: [Flightgear-devel] problems experienced with the recent c150 updates
Sometimes at the same time I also see the aircraft tumbling backwards and having its tail going underground, controls held neutral, tailwind never exceeding 7 knots. Could this be that the model doesn't account for the pilot's weight? Tumbling backwards is usually an indication that the airplane has failed to ground trim properly. Maybe something has changed the presets ? Dave ___ Flightgear-devel mailing list Flightgear-devel@flightgear.org http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
