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Technicalities: Glimpsed in Passing

Regardless of the number and
arrangement of horizontal surfaces, putting
the CG ahead of their collective centroid
makes the airplane longitudinally stable.
Piaggio Aero
Gemini Sparkle

Key Takeaways:

  • The author reflects on the unique perspectives gained from flying and the existential implications of being inadvertently captured on Google Street View.
  • The article transitions to a detailed discussion of aircraft weight and balance, particularly the regulatory requirements (FARs) for establishing safe center of gravity (CG) limits.
  • It explains that the forward CG limit is determined by control (e.g., ability to rotate for takeoff/landing), while the aft limit is set by the need for longitudinal stability.
  • The piece emphasizes the critical role of design elements like tail size and aerodynamic center in achieving proper stability and control, and the pilot's responsibility to adhere to weight and balance limits.
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Contempt and awe seldom wed, but height may make a match between them. One of the intermittent rewards of flying is the thought-provoking perspective it provides: We look down upon great cities reduced to anonymous gray smudges, or the lights of a solitary car speeding alone at midnight across a canvas of black velvet. The latter makes us reflect upon the unimagined lives of strangers — where is she going? what is he thinking about? — and the former upon the unimaginable multiplicity of such lives, each one a world, and yet each also a brief vestige upon the face of the land. Size had better not matter.

It was therefore with emotion that I learned, from my next-door neighbor, that I was to be seen on the Google “street view” of the intersection just below our houses. I looked, and indeed there I was. My face, along with a couple of license plates, was blurred from fear of lawyers, but my body, returning from the espresso joint down the street, coffee in right hand, newspapers under left arm, had been caught in a fortuitous space-time intersection with the Google camera-car, which, in spite of its resembling a rolling planetarium, I had entirely failed to notice.

Peter Garrison

Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.

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