Can I disengage the automatic trim? It might be a daft question, but I have only just purchased the 737NGX today, and I noticed that the trim wheels were moving on their own when I took the 737-800 out for a "quick spin" around the block :smile:

Search in the FCOM for Speed Trim System, it's actually a very, very useful feature. In my FCOM it's 9.20.8, but numbers might differ.

Thanks, mate. I had to flip the two Stabiliser Trim cutout switches. However, I noticed something else when I landed. There did not seem to be any animation on the engines when the thrust reversers were activated.....

 

EDIT: I guess the reverser "problem" is probably a limitation in the FSX "Replay" mode, although I would have expected it to work.

Still, why would you want to turn Speed trim off? I referenced it for you to understand the reason why it's there. Turning it off just increases your workload without any benefit.

That's because you aren't aware of one of the ways that I like to fly my planes. I fully appreciate how the auto trim would benefit anyone who is trying to fly the NGX "by the book" (and I am keen to do exactly that with this plane; for the first time ever, I might add), but I also like to enjoy flying "low and slow".......in an airliner. Cessnas are all very well, but I really enjoy cruising very slowly across the landscape in something a bit more "stylish". That being the case, I need to be able to fly it as slowly as possible, and that's where the manual trim comes in. I can trim the plane so that the cruising speed is hardly greater than the take off or landing speed, provided that I have the flaps fully deployed.

 

Not exactly straight from the airline pilot's handbook, but I enjoy it :smile:

Why not just throw her on CWS then? It still wouldn't be by the book, but it would make life a lot easier.

You would love to fly an A320 then, no need to trim yourself unless you are setting the initial takeoff trim ^_^

In the real plane I absolutely despise speed trim. I seriously hate it. It seems to work as described when making large speed changes but then you don't want it then because you are purposely making that change. After reaching my intended climb speed above 10,000 feet speed trim almost 100% of the time trims the wrong way. I deliberately activate the trim switches at the bugged speed to set that speed. If I even get a few knots above that speed speed trim pretty much always rolls in a little nose down trim. It should roll in nose up. When leveling the from a climb the reduction of power causes the nose to drop because of the low slung engines. It doesn't say this in the manual but speed trim will actually roll in some nose up trim to compensate for the reduction in thrust. The problem is it rolls the trim in too early so you will actually be fighting the trim to get the nose down to level the plane. If it waited a little longer it would actually be okay. The same thing happens in descents. I probably notice this more than most because I hand fly a lot but speed trim is just annoying. Okay rant over.

Speed Trim System, it's actually a very, very useful feature.

Still, why would you want to turn Speed trim off? I referenced it for you to understand the reason why it's there. Turning it off just increases your workload without any benefit.

It's probably useful from a certification view, but it seems like you end up fighting it. During acceleration and at 10,000ft, Speed Trim wants to keep you at your current speed but you want to go faster, so we end up battling over the trim wheel.

Just an update to say that this NGX is all it's cracked up to be. The 3D model is perfect, the VC is perfect, the sounds are sublime, and the flight model is top notch......and that's only scratching the surface of what's on offer here. A truly magnificent aircraft. I will definitely be getting my money's worth out of this beauty over the coming months and years. In fact, this is the first aircraft I have purchased that has made me want to learn how to fly these things properly. I will sit down one day, and go through those tutorials.

 

Thank you, PMDG :Party:

It's probably useful from a certification view, but it seems like you end up fighting it. During acceleration and at 10,000ft, Speed Trim wants to keep you at your current speed but you want to go faster, so we end up battling over the trim wheel.

To be honest I hadn't noticed it in NGX as yet. However, as Ralgh says, it can be counter intuitive in the real aircraft too, trimming in the opposite direction than you want! When accelerating, just give the trim a nude down as speed increases. I think it is something like 5 secs after a manual trim input that it can kick in again.

 

The same thing happens in descents. I probably notice this more than most because I hand fly a lot but speed trim is just annoying. Okay rant over.

I have never noticed it in descents.

I have never noticed it in descents.

Me neither. I only notice it during T/O and climb.

To be honest I hadn't noticed it in NGX as yet. However, as Ralgh says, it can be counter intuitive in the real aircraft too, trimming in the opposite direction than you want! When accelerating, just give the trim a nude down as speed increases. I think it is something like 5 secs after a manual trim input that it can kick in again.

 

 

I have never noticed it in descents.

 

It would only operate in descents if the STS sensed a requirement for trim; therefore the airplane must have been in an out of trim condition or trimmed for a different speed than that desired. As mentioned before, maybe CWS would be a better mode to utilise.

 

 

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To be honest I hadn't noticed it in NGX as yet.

 

I noticed. Especially annoying when ATC gives negative speed restriction below 10000.

 

Didn't know that real 737 behaves the same.