I just did a flight from WSSS to VIDP... well, I tried to. Right before hitting the Indian ocean, turbulance got bad, there were lots of thunderstorms below me, and a few clouds almost to my level of 32k feet. Well I got through that, but halfway between the shores of Singapore and India, it came again. Not only was my airplane bouncing up and down, but I could not hold a speed to save my life. I was flying the PMDG 747-400 freighter, at max throttle, even go-around thrust. and it would not hold any altitude at any speed without the stick shaker coming on. By the time I hit the Indian coastline, it was beyond belief. I even dove down at 3k feet a minute and my speed would not climb high enough to get out of stall speed. My flight level was now 180, and I was still at full throttle, barely at .60 mach. the stick shaker keep coming and going.Well to make a long story short, I quit after 4 hours wasted. 1.5 hrs away from my destination of Delhi, with no fuel left because I had full throttle the whole time and couldnt keep a flight level. I do not understand what exactly happened. I realize turbulance is severe but this is ridiculous. Are my settings wrong? I have FSUIPC and wind smoothing enabled, I even had a tail wind of 30 kts sometimes and STILL could not hold any speed. Please help me as this just ruined a great day of flying. Thanks

here is an example of my last few minutes before getting fed up. why is this happening?http://forums.avsim.net/user_files/155675.jpg

Hi Alex,Sorry for the troubled flight. Some suggestions:Might have have been turbulence. Please try with that Off.Now a dive with no speed increase: Were your flaps up? Was your speedbrake On? Of couse all of this by mistake.Reset FSUIPC to default settings and Weather settings Off.Give these a try and please let us know how things work out.Thanks,Jimhttp://www.hifisim.com/Active Sky V6 Development Team Active Sky V6 Proud SupporterHiFi Beta TeamRadar Contact Supporter: http://www.jdtllc.com/AirSource Member: http://www.air-source.us/FSEconomy Member:http://www.fseconomy.com/

Thanks for the reply. As you can see, no flaps nor gear. I love turbulance effects and wouldnt turn them off unless I could not get rid of this bizzare instance. The only weather setting I have for FSUIPC is smooth baro pressure changes. I will click the weather settings off button and try that, but since it is a 5 hour flight I will have to wait til this weekend to try it again. Thanks for this great program and the constant updates and support.

I am thinking of somethng else, may be in your setting, yo have selected some icing. The reason I say this is that I have suffered this wih PMDG and LVEL-D, but since I selected no icing, I have never encounter such prob.Cyrille de LattreAsus P4P800/PIV 3 Ghz/2 Giga DDRAMATI X800 GT 256 MegWin XP SP2 / FS9.1 PSS Beta tester

Hi,Check your trim! I'll bet it's all the way to nose up! Remember, that is the way the autopilot tries to hold altitude. As your airspeed drops due to turbulence, the A/P trims the nose up to hold altitude. More pitch -> lower speed -> more pitch etc... You get the point. But even if you disconnect your A/P, the trim wont go back by itself, so you have to handfly it and trim nose down. Of course, you'll lose altitude, but eventually you should be able to get it back.Been there - done that in LDS 767. Jacarta or Kuala Lumpur to Copenhagen. Lost all my altitude, spent 2/3 of my fuel due to low alt amd turbulence and had to divert to somewhere in Pakistan or Bangla desh.HTH & BRGDSSven Sorensen, EKCH

Thanks for the suggestions but it couldnt be the trim, because I disconnected the Ap at one point and dove nose down, over 2400 feet a minute and it still would not gain speed. It could have been severe icing but I had the anti-icing on... oh well

Well, as I said: Even if you disconnect A/P, your trim won't go back to normal. It will just stay where the A/P left it!And yes, your vertical speed may have shown -2400 ft/min, but what about your attitude? Near-stall - that still makes me think of trim. A plane (on the verge of) stalling may very vell have a high negative vertical speed, but will not increase airspeed.But as you said - oh, well :)BRGDSSven Sorensen, EKCH

that is true but I was trimming the aircraft as I was pushing down on the yoke. This weekend I will give it a try again

Hi Al,That may be true, but the yoke is not the same as trim. Trim is with a wheel, slider, or the #1 and #7 keys on a number keyboard.Jimhttp://www.hifisim.com/Active Sky V6 Development Team Active Sky V6 Proud SupporterHiFi Beta TeamRadar Contact Supporter: http://www.jdtllc.com/AirSource Member: http://www.air-source.us/FSEconomy Member:http://www.fseconomy.com/

Hey Jim, What I ment was I was using trim as I was pushing the yoke in to get the nose down

OK, I rest my case then :)BRGDSSven Sorensen, EKCH

what do you mean you rest your case. From 5 degrees nose up, to nose level, to 5-10 degrees nose down, the airplane just would not gain speed.

Both PMDG's QOS and Level-D 767 are sensitive to icing and turbulence. I have experienced major trauma with the default setting for turbulence and the option 'prevent all icing' unchecked. My turbulence setting is at the lowest value making any turbulence tolerable. Also, the 'prevent all icing' option is check as well.

Today I had some strange turbulence occurences either. I was flying from Gibraltar to Paris via Madrid and Montpellier. Pretty heavy thunderstorms on the way but not too strong winds (10knots max, mostly about 4 knots). At times my plane (C-119 Flying Boxcar) would go into steep dives or climbs (at times rising above 10,000 feet even though I set 9,500 feet as cruising heigth) or rapidly lose speed for no apparent reason, pulling excessive Gs in the process. That nasty "FSPassengers" penalized me for doing dangerous maneuvers and having people fly about the cabin by negative G-Forces even though the autopilot had the stick for the whole trip. :DI had turbulence before but never that strong. It was wicked.