On 8/9/2020 11:30 AM, Dr. Feng Hsu via KRnet wrote:
If there is any uncertainty about the CG
spot, or to put the last two ponds of extra luggage during loading,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
In spite of our many posts I keep thinking that flight characteristics
have not been expressed in a more meaningful way with regard to CG.
Flight characteristics do not remain in perfect harmony throughout the
CG range and then, at some point they reach a limit and a one or two
pound difference makes the aircraft uncontrollable. This does no happen
, for example, like a stall break. Handling characteristics deteriorate
gradually as the CG / CL change during flight from ideal to a point
where they approach the forward or aft limit. The pilot should be
noticing this change with necessary changes in stick forces and aircraft
response to control inputs. Increased airspeed or load shift are about
the only two immediate options available to the pilot when the limit is
reached as Mark did on his flight. Load shift is obvious. Increased
speed gives more control surface authority. Just remember, the higher
the speed you use to overcome a bad CG, the more energy you need to
dissipate when the flight comes to an end. If the outcome is not
controllable the more disastrous the end result.
Adding an extra pound or two here or there during build does not
necessarily make for an uncontrollable airplane. It merely limits your
loading options for safe flight.
Larry Flesner
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