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  1. #1
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    What Link2Fs extraction to use for a Turn Indicator Needle?

    Hi there, I've been trying out Link2Fs for a month and indeed, I am deeply impressed by all the functionality it provides. Now what i am trying to do is a servo- driven turn/slip indicator with an Arduino Card and FS9. The thing is, i don't know which FS9/Link2fs extraction to use in order to drive turn indicator needle. So far i've been using Ground velocity Z ( ?z ). In my understanding that one should be similar to Yaw Rate , but not quite, since it behaves in a strange way - when i initiate a turn on ground by using Ruder Pedals, if the turn is on the left, the extraction goes positive (+ 000,1 +010,0) and on the right goes negative ( -000,1 -010,0). But if i am commencing a turn in the air by using ailerons, the extraction is quite opposite - the values are negative when i am turning left and positive on the right. This behaviour results in swinging the needle opposite of the appropriate side, when i use rudder to turn the aircraft.
    Another extraction i've been trying for the purpose of driving turn indicator needle is: < J Heading , the difference btw. the new and the old heading over time in particular, again -with a moderate success though. What i am trying to ask is - if there is a foul -proven way to accomplish the task and what extraction is the most appropriate to use?

  2. #2
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    Re: What Link2Fs extraction to use for a Turn Indicator Needle?

    Some update - apparently the extraction ' Ground Velocity Z ' is not what i tough. It is not a yaw rate. After some more reading trough the FS Connect documentation, i found that the extraction needed to drive a turn coordinator needle is called:
    DELTA_HEADING_RATE ( Pseudegr./Sec). Unfortunately, it is not part of the Link2FS yet. Alternatively, I have to find a way to determine the rate of heading change over time by using extraction for heading and matching it with the change of time. I tought, the turn coordinator is the easyest instrument to build, but turned out not to be that way.

  3. #3
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    Re: What Link2Fs extraction to use for a Turn Indicator Needle?

    Hello trakon...

    Maybe this is what you're looking for?

    036E 1 Turn co-ordinator ball position (slip and skid). –128 is extreme left, +127 is extreme right, 0 is balanced.

    Try adding that offset to the Experts FSUIPC Extractions and see what it shows you when you fly.

    There is also:

    0380 4 32-bit floating point turn coordinator ball position, –1.0 to +1.0
    0384 4 32-bit floating point turn rate, degrees per second (–3.0 to +3.0 is equivalent to the 2 mins left/right range)

    You could experiment with all 3, fly around and see what values it shows you.

    Mike