speed hold in turboprops
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Thread: speed hold in turboprops

  1. #1

    speed hold in turboprops

    I know I saw a thread somewhere, maybe here before the crash, about adding speed hold to turboprops, and the parameters that had to be modified.

    If anyone here knows what I am talking about, I would appreciate it if you could point me in the right direction.

    Thanks!

    ~A~

  2. #2
    The following is from the default 737 cfg, note that the autothrottle available has a "1". You wioll also need an autopilot panel that has a speed select function.

    I have not tried this with a turboprop, but have a thrash at it!

    T.


    [autopilot]
    autopilot_available=1
    flight_director_available=1
    default_vertical_speed=1800
    autothrottle_available=1
    autothrottle_arming_required=1
    autothrottle_max_rpm = 90

  3. #3
    Yep, tried that, it just slowly decreases throttle to 0, and stays there. Trying to put it in the Dreamwings Dash-8 Q200, by the way.

    Thanks for trying.

  4. #4
    Too bad, it may not be possible to use autothrottle with the Turboprop. Did you find an autopilot panel to use thta had a speed control input (ie. a speed to set and associated button)?

  5. #5
    Sorry, been away for a bit.....

    Yep, auopilot has the IAS selector and input box, as well as autothrottle arming. I know it's possible, as I have a couple very nice turboprops that have it. I just haven't been able to figure it out yet.

  6. #6
    Quote Originally Posted by Astoroth View Post
    Sorry, been away for a bit.....

    Yep, auopilot has the IAS selector and input box, as well as autothrottle arming. I know it's possible, as I have a couple very nice turboprops that have it. I just haven't been able to figure it out yet.
    Look at your aircraft.cfg file what type engine is listed.

    Options are 0 thru 5 I think

  7. #7
    Here is what I think you are missing

    For a turbo prop the engine type is 5

    If that is the case then Toms settings should work.

    If the type is a 0 then the Turbo prop is modled as a piston engine.

    [GeneralEngineData]
    //0=Piston, 1=Jet, 2=None, 3=Helo-Turbine, 4=Rocket, 5=Turboprop
    engine_type = 0

    If that is the case change the max rpm to 3600 and it should work.

    autothrottle_max_rpm = 3600

    No pretension at realism here

    This is how you get auto throttle to work in a piston engine.

  8. #8
    Not sure if it is pertinent, but tables 317, 329, 1199, 1203, and 1533 relate to the AP and IAS/Mach Hold. You might visit those tables to look for issues as well.
    Milton Shupe
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