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Which statement is correct for a descent without engine thrust at maximum lift to drag ratio speed?
  • A
    The mass of an aeroplane does not have any effect on the speed for descent.
  • B
    The higher the gross mass the greater is the speed for descent.
  • C
    The higher the gross mass the lower is the speed for descent.
  • D
    The higher the average temperature (OAT) the lower is the speed for descent.

Refer to figures.
Considering aircraft’s weight, if it remains at VMD, a heavier aeroplane has the same lift/drag ratio and same glide angle and range.

This is because the lift and drag have increased in the same proportion.

However, the actual speed of VMD alters.

A heavier aeroplane has to glide at a faster speed to be at VMD because the drag curve has moved up and to the right.

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