3 hours ago, Bernard Ducret said:

There is no calculation issue if one adhere strictly to the procedure

That's what I thought, Bernard. Upon reading this thread this morning it was confusing reading all the conflicting reports. I always err on the side of user error when reports are mixed like this.

To be fair, the post about an update next week to "address the issue" has made it even more confusing but alas, it's not the end of the world.

There is certainly an issue with take off in this aircraft even when using Simbrief to import everything. Hopefully it gets fixed soon

19 minutes ago, BWBriscoe said:

There is certainly an issue with take off in this aircraft even when using Simbrief to import everything. Hopefully it gets fixed soon

I'm not denying there may be an issue for some but is there a reason why there isn't for others? Makes me think people are making honest mistakes during the FMC setup.

11 minutes ago, El Diablito said:

I'm not denying there may be an issue for some but is there a reason why there isn't for others? Makes me think people are making honest mistakes during the FMC setup.

Having read the difficulties some people get themselves into when installing software, updating their o/s, updating their drivers, changing bios settings, etc., I've never been more convinced that no developer can ever design a foolproof procedure.

Even with manuals, videos, or other step-by-step guides and simple installers, people still manage to tie themselves up in knots. Some vocal ones will blame the dev, adamant they followed the steps to the letter, only for it to turn out later that they really didn't.

Ah okay, I got it now. 

Thank you Brenard Ducret I got a perfect take-off.  It appears we are all too dumb to fly this plane. This is quite high fidelity in that you must have everything set correctly before you even attempt a take off.  

I did think the CG of 11 seemed strange, so it appears that Simbrief is not gospel.  You must download the Simbrief profiles found on the flightsim.to "product" page, it's near the bottom of the text and easy to install.

You also must have a full flight plan and enter it into the FMC so that the EFB can populate the airport and runway.  Once that was all done, everything matched up and I got the similar weights but this time the CG was calculated as 24, a number I would expect.  

Here is my flight plan:

Since many of you are visual learners I have taken screen shots to show you how it is all set up.  Weight and balance are in the INDEX>SETTINGS>WEIGHT AND BALANCE in the bottom right. 

You have to enter the flight plan first or else the EFB will not give you calculations, and the CALC button will not appear until all parameters are filled in.

For the sake of clarity and uniformity-for myself mainly.  I used the same flight.  And yes I know Air Tahiti Nui would have used KGs. I used flaps 15.

 Here you can see I entered everything from the sim brief profile.

TOW 457.1k LBS (207333kg) FUEL 111,887lbs (50,700kg) so that is different by 30k lbs! over stock Simbrief profile.  This time you see the CG is 24, which was closer to a number I expected. 11 just seemed wrong. and TO trim is only 5.00.

So we should all apologize to Horizon Sim.  I'll start.  Thank you Horizon Sim for making such a great airplane I was expecting a cartoon airplane or unfinished product and was too dumb to set it up properly for take off.   

I flew all the way to LA on 4X. You can fly on 8X as long as you are on a "straight away"  but you can't leave it on 8X through the turns it will hunt wildly for the altitude and heading.  I was able to land in LAX and did not get the nose drop on landing.  Because... of course everything was set up properly.  This new 789 is nothing like the KURO 787-8 when it was first launched so I hope they go back to the Kuro 787-8 and make it equally realistic. 

Thanks Bernard Ducret, I didn't say any thing you didn't say but I put in pictures so us Americans could understand.

Now one thing I did find a little out of place is the climb rate.  5kFPM seems a bit much this heavy.  

 

Edited October 29, 20232 yr by aniiran
grammar

On 10/28/2023 at 12:52 PM, ErichB said:

How does anything get released like this?

 

On 10/28/2023 at 12:56 PM, ErichB said:

I don't think people are generally ungrateful.  But after months and months of hype and a very good visual model, people just get knacked off when reasonable expectations become disappointments

because is the new norm.  based on what teeange streamers with zero experience in aviation and watched by again an army of the new wave kids from ms2020.

Ive had a copy of the aircraft (that i shouldnt) weeks and weeks ago as the kids involved in it were quite happy to send it out to their mates to make themselves look cool,  which then got sent to more people and then onto me.  

On 10/27/2023 at 8:39 PM, moekarout said:

Same problem here, no matter what my take off speed is, plane doesnt take off 

just had this issue in KLAX, using the actual boing 787 proformance tool (through work) and the actual ofp, and actual loadsheet on the eveving.  

it still wouldnt rotate and then jumped into the air and gave me a tail strike. back in the hanger while the kids tinker with it some more

I‘m using the special simbrief profiles, am importing solely w&b through the FMC, and yet still my CG is very low and the take off is a guaranteed tailstrike. What am I doing wrong?

48 minutes ago, Fiorentoni said:

I‘m using the special simbrief profiles, am importing solely w&b through the FMC, and yet still my CG is very low and the take off is a guaranteed tailstrike. What am I doing wrong?

And you are setting takeoff trim ?

There is something wrong with CG/Trim/Weight stations calculations by it's  own software.

I use it for short hops in Japan using real world timetable. So it's around 300 - 350 pax and 10-12 tons of fuel only. It gives me CG 29-30% calculated by FMC and trim of 3 - 3.25. From my experience I know I need to add 2 - 2.5. And I put it as 5.5

Rotation is smooth at 141, flaps 5 and a huge derate. The rotation technique should be like for Microsoft ATR-72. Slow rotation of nose gear. Lift off then keep a couple of seconds low angle to avoid a tailstrike. Then follow flight directors.

To avoid a rocket climb I choose CLB2 always.

I have noted two other things. Flare is too long for me. To avoid it I turn off A/T during flare and move levers to idle manually. No heavy nose gear drop for me.

If you import a flightplan into FMC and add SID and STAR later it gives you TOC and TOD. If you later shortcut approach FMC doesn't recalculate TOD even if you push execute. It gave me decent rate of 3500 fpm on last flight.

Plane is flyable at the moment definitely but CG should be refined.

4 hours ago, Fiorentoni said:

I‘m using the special simbrief profiles, am importing solely w&b through the FMC, and yet still my CG is very low and the take off is a guaranteed tailstrike. What am I doing wrong?

i had a poke around the headwind discord server this afternoon,  they are aware of the issue and are trying out some patches of the flight model config file.

you need to make sure your CG is correct and go by what the efb says, also as mentioned youll need to run your OFP through simbrief like  @aniiran has said, then click on "set from ofp" in  the settings page,

Then make sure that the CG isnt too low like 11 like alot of people are reporting, you want a figure of around 28 and then for exmaple NADP2. EO accel alt 800’, thrust reduction and acceleration at 1000’

for example out of orlando the other day I ran the offical boeing calculator and it saying a CG of 28

 

i've just got back to my simulator today and downloaded the -9 to take a look.

Yes, there's something not right somewhere , I did a couple of take offs and experience the problems as described on avsim.

I then reduced the pax and cargo load to nearly empty and loaded 20T of fuel through the FMC menu, and made a note of the MAC% on the weight and balance page. I then entered this MAC into the performance tool on the EFB after pressing copy FMC data. I then sent the output to the FMC, the MAC did not copy across to the FMC as it should have done, so I manually entered it on the take off page. I then set the required trim, did a take off and this time it rotated correctly.

I thought I'd cracked it so came around for a touch and go, without changing anything, other than of course selecting a Vref, however on the roll out with power re applied she wouldn't rotate again.

For reference the correct rotation technique is 3 degrees per second rate of rotation to put the aircraft symbol onto the TOGA reference line in the HUD, or around 10 degrees initially if not using the HUD 

@jon b

i just brought back the 24 jon.  Theres something not right with it.  Im tweaking the config files as we speak and will try and see how i get on.  if only that qw 787 was in ms2020 

 

Edited November 1, 20232 yr by Ray Proudfoot
Quoted post removed

1 hour ago, fluffyflops said:

i had a poke around the headwind discord server this afternoon,  they are aware of the issue and are trying out some patches of the flight model config file.

you need to make sure your CG is correct and go by what the efb says, also as mentioned youll need to run your OFP through simbrief like  @aniiran has said, then click on "set from ofp" in  the settings page,

Then make sure that the CG isnt too low like 11 like alot of people are reporting, you want a figure of around 28 and then for exmaple NADP2. EO accel alt 800’, thrust reduction and acceleration at 1000’

for example out of orlando the other day I ran the offical boeing calculator and it saying a CG of 28

 

and @pan pan pan , yes I did set the trim correctly, and yes, I did not touch the MSFS W&B menu and imported via Simbrief through the FMC. W&B and fuel updated correctly after importing, so W&B should be fine.
Also maybe I am misunderstood: I had no problems lifting off at VR (like others did, who used the MSFS W&B), but I had to pull a lot and tailstriked shortly before rocketing upwards with a pitch of almost 15-20. It's "only" the actual rotation that's borked. Do you see that, too, or is your takeoff completely fine?

Are you guys using flaps 15?   Horizon has stated they believe the issue may be the flaps and to use flaps 15 for takeoff. 

I have made about 10 takeoffs they were all smooth.  Also, make sure you are double checking the cargo load from Simbrief and entering it into weight and balance.  For some reason it imports numbers that are highly inflated and not from Simbrief.

One had 90k lbs. imported but the right number was only 20k.

Edited November 1, 20232 yr by aniiran