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The major difference between free-flight and radio-controlled scale
models is that all the adjustments to the flight path of the former
must be made before release. Free flight models must be capable of
stable flight, whether under power or on the glide, without the
need or the opportunity to carry out in-flight alterations. This is
a challenge most surely met by lightly loaded, slow-flying models
based on full size machines having those characteristics, best
typified by early bi-planes.
The Bliss Bibliographic Classification Association is an
association of users and supporters of the Bibliographic
Classification. The association promotes the development and use of
classification, publishes official amendments, enables users to
keep in touch and exchange experience, and gives them a say in the
future of the scheme. It is a nonprofit organization, founded in
1969, with members all over the world. Each of the following
schedules is the result of a rigorous and detailed analysis of the
terminology of the field in question, using the techniques of facet
analysis.
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