Chemtrails – 3.13 – U.S. Patent 3899144 (Powder Contrail Generation, 1975)

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U.S. Patent 3899144

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UNITED STATES PATENT – 3,899,144
POWDER CONTRAIL GENERATION
(Aug. 12, 1975)


 

ABSTRACT

Light scattering pigment powder particles, surface treated to minimize interparticle cohesive forces, are dispensed from a jet mill deagglomerator as separate single particles to produce a powder contrail having maximum visibility or radiation scattering ability for a given weight material.

BACKGROUND

The present invention relates to method and apparatus for contrail generation and the like.

An earlier known method in use for contrail generation involves oil smoke trails produced by injecting liquid oil directly into the hot jet exhaust of an aircraft target vehicle. The oil vaporizes and recondenses being the aircraft producing a brilliant white trail. Oil smoke trail production requires a minimum of equipment; and, the material is low in cost and readily available. However, oil smoke requires a heat source to vaporize the liquid oil and not all aircraft target vehicles, notably towed targets, have such a heat source. Also, at altitudes above about 25,000 feet oil smoke visibility degrades rapidly.

SUMMARY

The present invention is for a powder generator requiring no heat source to emit a “contrail” with sufficient visibility to aid in visual acquisition of an aircraft target vehicle and the like. The term “contrail” was adopted for convenience in identifying the visible powder trail of this invention. Aircraft target vehicles are used to simulate aerial threats for missile tests and often fly at altitudes between 5,000 and 20,000 feet at speeds of 300 and 400 knots or more. The present invention is also suitable for use in other aircraft vehicles to generate contrails or reflective screens for any desired purpose.

The powder contrail generator is normally carried on an aircraft in a pod containing a ram air tube and powder feed hopper. Powder particles, surface treated to minimize interparticle cohesive forces are fed from the hopper to a deagglomerator and then to the ram air tube for dispensing as separate single particles to produce a contrail having maximum visibility for a given weight material. Other object , advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing.

Source: United States Patent 3,899,144 Document, Pg 3

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