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AWACS

Horizontal Stabilators

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Hi, I don't know if this has been adressed before, I ran a search on it, but didn't find anything. I guess my question is, why is it that the horizontal stabilators don't move realistically, when I adjust my trim on the ground, the stabilators shake a little bit, but don't actually change position like in real life, and I was wondering why PMDG has not made a fix for this. The only reason I can think of for this is that I don't know what I'm talking about or, this is on;y an issue with my 737. From what I know, when you trim full up the stabilators should be full down, and when you set trim full down, the stabilators will be in a fully upward position. Anyone who can help me on this issue?Thanks,Jeff USAF


Jeff

Commercial | Instrument | Multi-Engine Land

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JeffThe stabs are moving with the stab trim. At least it did last time I checked. They will however 'shake' a little for each step. This is due to PMDG altering the default FS9 trim which was found to be too crude.This subject has been up to discussion before as well. ;-)Hope it helps,


Mats Johansson
PMDG Flight Test Dept
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Oh. I know on our AWACS that the whole unit moves, and on the 737-200 the whole unit moves when adjusting trim, but you're saying they changed that on the NG? I'm confused I guess, anyway on my PMDG 737NG's nothing moves when I trim, it starts to move but then clicks back now matter how far I trim.Jeff USAF**Update** I just tried the 736 and it works fine, but then I went to the 738 American Airlines and I don't even have the little white notch for my trim position on the throttle panel, when I trim I can hear the trim wheel, but that's it. This is probably why I thought it didn't work, I don't know how to fix this.


Jeff

Commercial | Instrument | Multi-Engine Land

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Jeff,On the NG the whole horizontal stabilizer unit moves with stab trim. But only the elevator moves for pitch manouvers. That's what different to a stabilator I guess, even if i've never heard the latter name before.PS. What's your weight distribution on that -800? And did you experience the loss of stab trim indicator in flight?Cheers,


Mats Johansson
PMDG Flight Test Dept
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| Asus Z270-A | Intel i5-7600K @ 4.8 GHz OC/H2O | nVidia Geforce GTX 1070 8GB OC/O2|

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No I was on the ground, and I switched from the -600 to the -800 and actually last night when i was testing it out was the first time I noticed that the whole stabilizer actually moves like it should, so then I switched to the -800 just to do a check between the first NG's and the second ones that were released, the -800/900, and unfortunately the 800 so far has failed. I've had these planes since they came out and have noticed this before, just never brought it up.Jeff USAF


Jeff

Commercial | Instrument | Multi-Engine Land

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Jeff,First lets clear up Stabilators Vs. Stabilizers with Elevators. All large transport aircraft that I have ever worked with the exception of the L-1011, have a Horizontal Stabilizer with Elevators. Fighters like the F-16 and F-18 use stabilators. With a Stabilizer/Elevator system, the Stabilizer is Trimmed to unload the elevator to a nuetral position by pivoting the stabilizer up and down. The elevator actually performs the normal pitch up/pitch down command via the Yoke (or stick). On a stabilator, the entire stabilator moves when the Yoke or stick are moved and there are no elevators. What you are seeing on the PMDG 737 has been discussed at length shortly after the release of the 1.3 package for the PMDG 737 600/700. FS9 allowed the elevator (stab) trim to operate at a speed that trims the stabilizer on any FS aircraft full range in about 3 seconds. Now on a real 737 or any other large aircraft, thats not even close to realistic and it makes the aircraft hard to fly as continual trim adjustments are necessary due to the large changes made for small inputs. We adjusted the trim rate to a realistic speed but the side effect is an animation Jump on the external model and the Indicator. The end result is a stab trim that speed wise, functions much like the real thing and doesn't require constant adjustment due to over corrections in stab position. Hope that clears things up.RegardsPaul Gollnick :-cool Technical Operations/Customer Operational SupportPrecision Manuals Development Groupwww.precisionmanuals.comhttp://www.precisionmanuals.com/images/forum/devteam.jpg


Paul Gollnick

Manager Customer/Technical Support

Precision Manuals Development Group

www.precisionmanuals.com

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Cool stuffThanks,Jeff


Jeff

Commercial | Instrument | Multi-Engine Land

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