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Vertical speed indicator not accurate.

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  • Vertical speed indicator not accurate.

    I barely post so I'm not too sure I should post this here, but I will since this is Yak's forum.

    I have been taking notes on some DCS aircraft climb performances using the TAC view and without it with a chronometer, and after many tries I noticed the Yak-52 vertical speed indicator is showing 1/3, or so, less vertical speed than it really climbs. I guess that would be not important if it was a bit less, but I think it's a lot of difference from the real climb and would be nice if it was looked into.

    An example: climbing to 2.000 meters from 200 feet takes me around 5 minutes and 50 seconds (which is equivalent to 5,8 m/s aprox), but the cockpit is actually reading less than 4 m/s vertical speed. I'ts just an example of one of the tries but I did many and at different altitudes and every time the difference is similar.

    Sorry if this is unimportant, and for my basic english

  • #2
    Try keeping your vertical speed at some constant value (say 3 m/s) for 1 minute and check altitude delta (should be 180 meters). That’d be much more accurate.


    • #3
      Thanks for the advice, easier and faster that way!

      I just did a few tests, all of them with vertical speed in cockpit showing 3m/s sustained during a few minutes, so I could take more than 5-6 readings. For example, it took me exactly 1 minute from 500 feet altitude to 1.400 feet (900 feet/minute) keeping the vertical speed indicator showing exactly 3 m/s. That would mean every minute I should have climbed 590,5 feet, when I actually climbed 900, which means 4,57 m/s, and not 3 as the Yak was showing.

      I guess it's not very important when flying since all the important data for climb profiles usually points speed and altitude, but I thought maybe someone would see it worth knowing.


      • #4
        IRL dynamic + temperature errors can reach 30%. The main function of the device - to watch the accuracy of level flight. There is also a time lag - from 1 to 2 sec.