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Thread: Diamond Da-40 - MSFS vs. real world?

  1. #1
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    Question Diamond Da-40 - MSFS vs. real world?

    I have been flying the Da-40 several times in MSFS. A nice-looking plane and it flies very nice. Has a similar instrument layout as the Cessna 172 (with G1000 of course). I looked at references to the Da-40 in the real world. Specs say that a cruise of 150 or so is normal specification. On MSFS the speed display goes to yellow at 130. And full power at level flight does not go faster than 130. Did MS downgrade this airplane? Or is it just not accurate.

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    Quote Originally Posted by Patinthedesert View Post
    I have been flying the Da-40 several times in MSFS. A nice-looking plane and it flies very nice. Has a similar instrument layout as the Cessna 172 (with G1000 of course). I looked at references to the Da-40 in the real world. Specs say that a cruise of 150 or so is normal specification. On MSFS the speed display goes to yellow at 130. And full power at level flight does not go faster than 130. Did MS downgrade this airplane? Or is it just not accurate.
    It's neither downgraded nor inaccurate, from what I can tell.

    I just looked up a POH for the DA-40 from 2010. There, the maximum structural cruising speed is listed as 129 knots, meaning this is the maximum recommended speed in perfectly smooth air. This number is consistent with the speed display as you describe it. The yellow portion of the display is telling you that it may be permissible to reach speeds in that portion, in perfectly smooth air, but do so with caution.

    I don't know what your source is for "specs" saying that cruise of 150 is normal. That doesn't sound right per the POH. Anyway, if you're cruising at 129 and lower the nose, you could easily reach 150, and this is where the manufacturer is warning you: go ahead and hit 150 if you like, in perfect conditions, but be careful.

    In the real world, the consequence of exceeding speed barriers is the breaking apart of your airplane in mid-air. This is terrifying stuff!
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  3. #3
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    130 knots is 150 MPH -- that might be the difference.

    Larry N.

    As Skylab would say:
    Remember: Aviation is NOT an exact Science!

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    Quote Originally Posted by lnuss View Post
    130 knots is 150 MPH -- that might be the difference.
    Ah, perhaps that explains it. I get confused why aircraft use knots. Why do we need yet another speed or distance measurement. Is this tied back to ships somehow? I guess if it confuses me too much I could switch to metric. There probably is a way to switch to KPH in the controls somewhere.

    Pat

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    Multiply knots by 1.15 to get mph, or divide mph by 1.15 to get knots. For me it's easy to recall that 100 kts is 115 mph, or mph is 15 more per 100. And yes, the measurement system came from the nautical world, and even has a logical basis for vehicles going long haul, since a nautical mile started out as one minute of latitude (1/60º), making navigation quite a bit easier on charts marked with lat/long.

    Here's a brief entry from Wikipedia:

    A nautical mile is a unit of measurement used in air, marine, and space navigation, and for the definition of territorial waters. Historically, it was defined as one minute (1 / 60 of a degree) of latitude along any line of longitude.Today the international nautical mile is defined as exactly 1852 metres (6076 ft; 1.151 mi). The derived unit of speed is the knot, one nautical mile per hour.
    Aircraft in the U.S. used to use MPH, but over the last part of the 20th century, the industry started to do things the same way as much of the rest of the world, thus knots (nautical miles per hour) and METARS (used to be sequence reports, which I liked better, but they didn't ask me), a bit of a change in flight plan forms, and some other minor odds and ends.

    Larry N.

    As Skylab would say:
    Remember: Aviation is NOT an exact Science!

  6. #6

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    Divide Statute miles per hour (MPH) by 1.15 and you will get nautical miles per hour (Knots).

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    Quote Originally Posted by PAULCRAIG View Post
    Divide Statute miles per hour (MPH) by 1.15 and you will get nautical miles per hour (Knots).
    Did you read my post above?

    Larry N.

    As Skylab would say:
    Remember: Aviation is NOT an exact Science!

  8. #8

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    Sorry missed your post.

  9. #9
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    Quote Originally Posted by lnuss View Post
    Did you read my post above?
    No biggie...

    Larry N.

    As Skylab would say:
    Remember: Aviation is NOT an exact Science!

  10. #10
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    Quote Originally Posted by lnuss View Post
    130 knots is 150 MPH -- that might be the difference.
    Isn't the issue that the specs are KTAS and the gauge is showing KIAS?

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