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Type: Posts; User: Waldo Pepper

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    Poll: Hi Frank, You've made a number of...

    Hi Frank,


    You've made a number of interesting observations which are usually not examined in much detail.
    One is that an aircraft once free of the ground becomes a part of the air mass, it no...
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    Poll: Hi Dana, The graph you presented is obviously...

    Hi Dana,

    The graph you presented is obviously for illustration purposes.
    A more to the point statement is that Vy is the peak of the L/D curve for the entire aircraft at full power (not just the...
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    Poll: Hi WLTU, Good point on the 60 then 56 KIAS and I...

    Hi WLTU,
    Good point on the 60 then 56 KIAS and I fully expect that, assuming the manufacturers actually fully test their aircraft for the numbers they put in their Handbooks, that there is variation...
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    Poll: Hi Keen9, I looked through some of those CAFE...

    Hi Keen9,
    I looked through some of those CAFE reports (Thanks for the link) and didn't run across the one(s) you are referring to for Vx and Vy, would you mention which ones do?
    Thanks
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    Poll: Hi Marc, " Obstacle clearance after a takeoff...

    Hi Marc,
    "
    Obstacle clearance after a takeoff roll can't be used to derive climb RATE at a particular airspeed."

    Evidence of why not is why I posted this question.

    BTW, If you would, I would...
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    Poll: Hi Dana, I fully understand why it's so...

    Hi Dana,
    I fully understand why it's so difficult to accept that Vy gives a steeper climb than Vx, but using the definition of Vx to validate Vx is circuitous reasoning.
    I don't quite believe it...
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    Poll: Hi Marc, Very insightful questions, As I think...

    Hi Marc, Very insightful questions,

    As I think I noted in the SS none of the manuals I looked at gave the climb rate for Vx, nor did they give the ground roll distance for a Vy TO.
    Looking...
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    Poll: Cessan POHs Link

    For anyone wishing to check the numbers in the SS or add some new planes, here's a link to Cessna POHs:

    https://www.manualslib.com/brand/cessna/aircrafts.html
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    Poll: Good catch on TAN v ATAN, I guess I was too busy...

    Good catch on TAN v ATAN, I guess I was too busy coloring the spread sheet.
    But as you pointed out for small angles it doesn't make much difference in the result (some of the angles over ~4 degrees...
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    Poll: Agree Marty, but the question wasn't about flying...

    Agree Marty, but the question wasn't about flying techniques, it was just simply "If you fly at the POH Vx speed is your flight path angle greater or less than if you fly at the POH Vy speed?"
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    Poll: Vy flight path angle greater than Vx ???

    A while back I decided to analyze runway design for obstacle clearances (angle to 50' vs distance vs climb rate vs speed, etc.) using my trusty spread sheet.
    In so doing I decided to incorporate...
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