Rarefaction

This, the opposite of compression, has come to the forefront, or to a forefront, partially by way of exposure to the work of Alfred E. Wunderlich. The thinning of air is used as a means of propulsion. It leads to ideas of LTA, without gas, and without balloon, and it is also used in conjunction with airplane, and ideas of self-propulsion.

Contemporary sources, that is sources contemporary to us, now, seem to segue directly from this term into fields non-pertinent to aviation, or even to air itself.

Britannica on Rarefaction This wiki has 15 patents in category "Rarefaction".

Patents in category Rarefaction

• Patent FR-1893-232215 (English title: Propulsion of balloons or aerostat par the air density-reduction or relative vacuum in the direction of the movement to be obtained, Inventors: Auguste Debayeux)
• Patent BE-1907-197626 (English title: Aeroplane with dynamic rarefaction, known as: “Autoplane”, Inventors: Alfred E. Wunderlich, Filing date: 1907-02-01)
• Patent BE-1907-197626.202678 (English title: Aeroplane with dynamic rarefaction, known as: “Autoplane”, Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1907-197626, Filing date: 1907-09-19)
• Patent BE-1907-202697 (English title: Instruments of measuring and of weighing forces and apparatus air thinning or of compression of air layers, these apparatus reclosing in the circumlocution of the pilots who raise and sustain in the air, without supporting balloon strictly by the force of a motor mechanism of propulsion and lift-sus, Inventors: Alfred E. Wunderlich, Filing date: 1907-09-20, Applicant firm: A. Wunderlich & Cie, Ingénieurs-Conseils)
• Patent FR-1908-385744 (English title: Airplane of air-thinning in aid of propulsion, called "autoplane", Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1907-202697, Filing date: 1907-12-23)
• Patent ES-1908-42535 (English title: Airplane of dynamic air density-thinning called "autoplane", Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1907-202697, Filing date: 1908-01-28)
• Patent IT-1908-93609 (English title: Airplane of air-thinning in aid of propulsion, called "autoplane", Inventors: Alfred Wunderlich, Supplementary to patent: Patent BE-1907-202697, Filing date: 1908-01-30)
• Patent FR-1909-385744.10634 (English title: Airplane of dynamic air density-thinning called "autoplane", Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent FR-1908-385744 • Patent BE-1907-202697, Filing date: 1909-03-12)
• Patent FR-1909-385744.12005 (English title: Airplane of dynamic air-thinning called "autoplane", Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent FR-1908-385744 • Patent FR-1909-385744.10634 • Patent BE-1907-202697, Filing date: 1909-12-28)
• Patent BE-1910-202697.224719 (English title: Instruments for measuring and weighing forces and devices for rarefaction or compression of air layers, carried by (?) the airmen who ascend or maintain altitude without a supporting balloon using only the force of a motor mechanism of propulsion and lift-sustentation, Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1907-202697, Filing date: 1910-04-08, Applicant firm: A. Wunderlich & Cie, Ingénieurs-Conseils)
• Patent FR-1911-436202 (English title: Airplane with variable wing incidence and automatic stability, Inventors: Auguste-Pierre Biais • Jean-Jules Cambou, Filing date: 1911-08-02)
• Patent FR-1913-447992 (English title: New application of atmospheric pressure and local, constant, depletion of air to the construction of air-ships without a balloon and, as a result, without gas, Inventors: Johannes Jacobus Loke, Filing date: 1912-09-04)
• Patent HU-1912-62050 (English title: An airplane with an automatic change of the angle of incidence of the bearing surfaces and a center of total residual pressure, Inventors: Auguste-Pierre Biais • Jean-Jules Cambou • Charles Baillod, Supplementary to patent: Patent BE-1911-11-17, Filing date: 1912-11-16)
• Patent BE-1907-197626.202444 (English title: Aeroplane with dynamic rarefaction, known as: “Autoplane”, Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1907-197626, Filing date: 1907-08-06)
• Patent BE-1907-197626.202144 (English title: Aeroplane with dynamic rarefaction, known as: “Autoplane”, Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1907-197626, Filing date: 1907-08-06)

Enclosing categories	Simple tech terms
Subcategories
Keywords	Propulsion, Lift, Sustentation, Ascension, Propellers, Aerodynamics, Hybrid, LTA, Airplane
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