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Why does Vx increase with weight?

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  1. Patrick Flannigan on Jun 21, 2013

    From the Pilots Handbook of Aeronautical Knowledge, page 10-7:

    “The maximum angle of climb would occur where there exists the greatest difference between thrust available and thrust required; i.e., for the propeller-powered airplane, the maximum excess thrust and angle of climb will occur at some speed just above the stall speed…”

    This may be oversimplifying the matter, but think about it this way:

    Vx is proportional to stall speed. Since stall speed increases with weight, so does Vx.

    To really understand angle of climb, I suggest you read up on thrust and power in chapter 10 of the PHAK, or the aerodynamics chapter of your books.

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