737 1.3 updated with "PMDG 737 800/900 VERSION 1.10" running 737-800 in VC mode. FS9 Win XP.After program FMC include push the buttons for gross weight etc. Take off works as expected, at 1000ft I engage AP with LNAV pre-selected I release my hands from yoke, the climb and turns work fine holding approx V2 speed (maybe + some 10-20 knts). At 2000 ft I push VNAV and the pitch INCREASE, slowly but stable increase until stall. After push VNAV I also look the red band for over/under -speed indication is red all the way. I repeat three take off include restart FS, same behavour.Anybody has some hint what can be wrong ?/ Lennart Vedin

Could be a computer/sim problem, but how are you configured for take-off and clean-up?I think the sim is modeled on the FMC U10.6, and it might be best to enter VNAV after 3000 AGL.

Could be a computer/sim problem, but how are you configured for take-off and clean-up?I think the sim is modeled on the FMC U10.6, and it might be best to enter VNAV after 3000 AGL.

Ok thanks, i will try enter VNAV later. Else i will note the configuration.Thanks again :(

No succeed. Same at 3000 AGL or 7000 AGL no matter. VNAV 'cause a pitch to lower the speed until stall.Here is the configuration. I did also try flaps 15 with no derate and got the same result.(Notice the weight show Kg in the FMC)Here is the strange red band that sould not be there, the AC behavour perfect in this non VNAV flying.The red band disappear as soon as I set flaps less than 10 deg.

Looks like it might be a sim/computer problem. I'm guessing the tech gurus can help. Good luck!

Here is the strange red band that sould not be there, the AC behavour perfect in this non VNAV flying.The red band disappear as soon as I set flaps less than 10 deg.

Lennart,The red band problem has already been documented several times in this forum. Try the search function and you should be able to find it easily.Good luck.Bruno

I have search for "VNAV stall", nothing.I have search "red" and find issues with the red bricks. It seams the 737-600/700 not have the red bricks problem. However I have tried first the 737-700 in VC mode, updated as my first post, and it crash typical after 1 hour flight. The main problem with 737-800 (as it still have not crash during my tests), is I can not use VNAV to climb. I don't know if the VNAV problem is connected to red bricks, or if there is any solution at all to try.I can not see any installation problem. My PMDG 747 is installed first and works 100% .

I have search for "VNAV stall", nothing.I have search "red" and find issues with the red bricks. It seams the 737-600/700 not have the red bricks problem. However I have tried first the 737-700 in VC mode, updated as my first post, and it crash typical after 1 hour flight. The main problem with 737-800 (as it still have not crash during my tests), is I can not use VNAV to climb. I don't know if the VNAV problem is connected to red bricks, or if there is any solution at all to try.I can not see any installation problem. My PMDG 747 is installed first and works 100% .

Make sure you have the correct version of FSUIPC installed. Also can you provide a screen shot of the PFD, MFD and MCP?

FCUIPC 3.98aPre takeoff (same setting as my first post). Trim is set to 4.90 according to FMC.Just before rotate there is no picture, however the MCP V1R is at 141 knts and the MCP bug at 147 knts.After rotate with full yoke and very low rotate-speed. (While later flying the 737 feel fine with yoke.)After engage cmd A. (I use PMDG option Throttle AND Yoke has no affect in AP-mode.)Just before engage VNAVNow after engage VNAV I see the pitch up effect as an answer on VNAV-mode, and pitch up continue.Stall.Im not a 737 guru in the calculation of V2 etc, but I get the feeling the AC is to heavy and require higher V2 and as well the VNAV is based on wrong weight. But if so I not understand how come.

Im not a 737 guru in the calculation of V2 etc, but I get the feeling the AC is to heavy and require higher V2 and as well the VNAV is based on wrong weight. But if so I not understand how come.

Note that in the last two pictures you posted the commanded speed is 0. VNAV shouldn't command a speed of 0. Before takeoff, what does your your CLIMB page look like? Can you post a pic of that?I don't think it's how you're flying or how heavy the plane is, I think it's a computer/software problem.

What happens when you use CLB instead of CLB2 thrust? Also, try 5,000 lbs per side and block 1,000lbs. I am wondering if the small decimal in the block fuel is causing an issue.I also have to agree with the previous post, this looks like it could be an install issue. Have you tried to reinstalling?

Now things start change :( Notice this is the clb page WITH the stall problem.I did following1. reinstall the CD with 600/700 1.32. installed the 800/900 option repair (latest version told by PMDG).3. re-install Navigraph AIRAC/TP.(I skip the 600/700 update for VC, no need).4. I currently run all possible as default (not the SAS-model).Notice the clb page has a different speed restriction.All the climb work as as it should, also the red over/underspeed indication.Only the rotate I feel really nothing happen until V2 and take off V2+20, feel slow and strange. Trim is set 4.90 :( I have not yet try the SAS-model and all as my configuration, I will report how it goes later.Remarks: I did try CLB thrust and block 1,000lbs before re-install, no difference.

Now things start change :( Notice this is the clb page WITH the stall problem.I did following1. reinstall the CD with 600/700 1.32. installed the 800/900 option repair (latest version told by PMDG).3. re-install Navigraph AIRAC/TP.(I skip the 600/700 update for VC, no need).4. I currently run all possible as default (not the SAS-model).Notice the clb page has a different speed restriction.All the climb work as as it should, also the red over/underspeed indication.Only the rotate I feel really nothing happen until V2 and take off V2+20, feel slow and strange. Trim is set 4.90 :( I have not yet try the SAS-model and all as my configuration, I will report how it goes later.Remarks: I did try CLB thrust and block 1,000lbs before re-install, no difference.

Glad to hear its working, as we thought sounds like there was an install issue. Concerning rotate issue, what are you using for controllers?

Glad to hear its working, as we thought sounds like there was an install issue. Concerning rotate issue, what are you using for controllers?

CH products. I did just try the 747, it start rotate fine at Vr with +50% yoke. As well FCUIPC show elevator output span -16000 +16000 neutral 0. Maybe i should try use trimsetting + 0.5 or something.

CH products. I did just try the 747, it start rotate fine at Vr with +50% yoke. As well FCUIPC show elevator output span -16000 +16000 neutral 0. Maybe i should try use trimsetting + 0.5 or something.

No this is what I suspected, I have had a similar issue. You need to load the latest CH control manager and then calibrate each product (you must calibrate each axis). This will fix the trim issue. Unfortunately the default MS drivers and calibration have issues.Set FSUIPC control overrides back to defaults as well.http://www.chproducts.com/retail/tech_control_manager.html