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  • Ben W
    replied to New question
    Thrust = Drag + (W Sin Gamma) where gamma is Climb angle.

    My calculator gives 1,165,551, which could be rounded up to 1,200,000 if that's the nearest answer.

    These figures fit the A380 quite well: Max thrust: about 300Kn per engine, MTOM about 575 tonnes
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  • Read the question again.
    Your Maths give us the increase in CL. But this is not what the question is asking for.
    It wants the new value of CL, and tells us that the CL is already 0.42 before the increase.
    So the new value is 0.42 + 0.504 = 0.924.
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  • Ben W
    replied to Oblique shockwaves
    The image in ATPdigital is a major simplification, showing only the part of the shockwave directly ahead of the nose.

    If you type Shell Oil Transonic Flight into YouTube you should get a 19min 58 second video. Between about 3mins and 4.15 mins you can observe the bigger picture of what...
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  • Ben W
    replied to 811395
    We think it's when the buffet starts because the regulations do not allow air transport aircraft to go as far as encountering buffet.

    Therefore, air transport operations involve ensuring that we keep away from the " buffet boundary", which means ensuring that we maintain an adequate...
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  • Ben W
    replied to Stick force question
    You have unearthed a thread from nearly 15 years ago written by someone who was an ex-instructor way back then. The answer he gives goes way beyond current learning objectives.
    All you need to know is that a bob weight is a means of increasing stick forces, especially under increased load factor....
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  • Ben W
    replied to 811396
    Numbers can be rounded down as well as rounded up. ( If in doubt, ask Her Majesty's Inspector of Taxes!)
    0.455 is much, much closer to 0.45 than it is to 0.50 and an ATPL examiner would expect you to choose the nearest answer. If this involves slight rounding down, that's fine
    The numbers...
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  • Ben W
    replied to Id 810101
    The use of the phrase at constant airspeed in an ATPL exam question implies that the speed is the same after the event has occurred. It is assumed that the pilot takes any necessary action to make it so.
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  • Ben W
    replied to Id 81011
    I think you may be talking about Q 811011.
    We are indeed talking about a constant speed propeller, but the more sophisticated type where the pilot can adjust the speed that the propeller is to maintain.
    The way this works is that if the pilot wants more rpm, he pushes the propeller lever...
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  • Ben W
    replied to Id 810101
    I think you may actually be talking about Q 811010.
    A windmilling propeller blade with zero pitch will have the chord line of its aerofoil section at 90 degrees to the airflow through the propeller disc. It will be presenting a virtually flat plate to that airflow and it will produce lots of drag....
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Ben W
Ben W
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Last Activity: 10-11-2018, 09:59
Joined: 13-05-2014
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