A few years ago, problems arose with some high-performance composite kit airplanes when it was discovered that under certain loading conditions, they had neutral to slightly unstable pitch characteristics.
Sometimes homebuilt designers ignore established standards and trouble ensues. They may not be mandatory, but they serve as good guidelines for what is required to produce a safe airplane that a pilot can fly with reasonable ease. The regulatory requirements for certifying airplanes may be burdensome, but many of them, including the flying qualities specifications, are based on well-established and valid criteria. FAR Part 23 or the European JAR-VLA requirements.
Despite this, a homebuilt designer would be well advised to be familiar with the flying qualities requirements of regulatory standards such as the U.S. One challenge in the homebuilt/Experimental airplane world is that we are not required by law or regulation to make airplanes that meet any of the established regulatory standards for flying qualities. In more modern times, standards have been established for acceptable levels of stability, control response, stall characteristics, and many other facets of how the airplane flies. It calls out performance, physical specifications, airworthiness (albeit in a very rudimentary way), and pricing schedule.
Take off cruising descend landing how to#
Despite this, it serves as a good example of how to set requirements. It’s a single page-quite a contrast to today’s military aircraft specifications. The entire specification can be found online.
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