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Thread: Stabilizer Trim

  1. #1

    Default Stabilizer Trim

    At 132000 lbs 175kts flaps 15 she keeps calling for elavator trim (up) to the point the trim light burns. The high trim stays with me all the way down thru flaps 30 127kts almost 10 degrees up. Trim runs rather erratic up and down up and down but generaly settles around 10 degrees. My weight balance looks ok to me.

    Any idea's?

    Thanks.

    Gary

    :7

  2. #2

    Default RE: Stabilizer Trim

    I've lots of idea's Gary, what's the question?
    Cheers

    Paul Golding
    Dreamfleet/Flight1 727 & 727X Developer

  3. #3

    Default RE: Stabilizer Trim

    Is it normal that it calls for almost 10 degrees trim Paul, at that speed with flaps at 15?

    Thanks Paul.

  4. #4

    Default RE: Stabilizer Trim

    What is your altitude when calling for flaps 15?

  5. #5

    Default RE: Stabilizer Trim

    By my calculations, Vref is 122, flaps 15 is 137kts. Sounds like too fast for the weight and flaps configuration.
    Should be flaps 2 at 182kts, flaps 5 at 152, flaps 15 at 137. It appears everything comes back to normal when you get to 140 or less.

  6. #6
    Join Date
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    Default RE: Stabilizer Trim

    oops, nevermind
    i5 2500k / Asrock P67 Extreme4 gen3 / 8800GTS 512 / 8GB DDR3 1600 / CM hyper 212 / antec 550W / ASUS 23" VH232H / Windows 7 - 64
    FSX UTX GEX REX TEX MEX SEX

  7. #7

    Default RE: Stabilizer Trim

    Good catch Wes, but it calls for trim up. You would think excess speed and flaps it would want to trim down, no?

    I will have to watch it more closely but it does it right through all flaps to flaps 30 at 122kts.

    Version one didn't do this. If it is only me I wonder if something else I am running is causing it. I am running Reality XP WX500 which has on ocassion caused unexpected results with certain panels. I will remove it and see if it clears up.

    >By my calculations, Vref is 122, flaps 15 is 137kts. Sounds
    >like too fast for the weight and flaps configuration.
    > Should be flaps 2 at 182kts, flaps 5 at 152, flaps 15 at 137.
    >It appears everything comes back to normal when you get to 140
    >or less.

  8. #8

    Default RE: Stabilizer Trim

    The new flight models are actually quite different to the originals. In V1 there was little or no effect of attitude when lowering flaps, whereas the real 727 actually pitches down rather a lot with flap deployment; hence the need to trim up.

    With regard to the Stab Trim light, this now only appears when the AP is in use and is purely there to indicate high levels of trim so that when the AP is disengaged, you know there's a lot of trim in use. It's not a case of you shouldn't be using more than +/- 5 units of trim; hence the performance tables giving take-off trim settings up to +10, if this is what's needed based of C of G.

    A look at a few 727 landing pics at airliners.net will show some very aggressively trimmed stabilizers, so it does happen in real life :-)
    Cheers

    Paul Golding
    Dreamfleet/Flight1 727 & 727X Developer

  9. #9

    Default RE: Stabilizer Trim

    All right Paul you have redeemed yourself, you’re still a good man in my books.:)

    I was worried that something was wrong. I uninstalled RXP WX500 and it still did the same thing.

    I am very happy that all is well.

    And thanks for the quick response. I absolutely love this plane. You guys do great work.


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