WO1991011676A3 - Hypervelocity drag reduction - Google Patents

Hypervelocity drag reduction Download PDF

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Publication number
WO1991011676A3
WO1991011676A3 PCT/GB1991/000111 GB9100111W WO9111676A3 WO 1991011676 A3 WO1991011676 A3 WO 1991011676A3 GB 9100111 W GB9100111 W GB 9100111W WO 9111676 A3 WO9111676 A3 WO 9111676A3
Authority
WO
WIPO (PCT)
Prior art keywords
projectile
drag
liquid
reduced
atmosphere
Prior art date
Application number
PCT/GB1991/000111
Other languages
French (fr)
Other versions
WO1991011676A2 (en
Inventor
Colin Humphry Bruce Jack
Original Assignee
Colin Humphry Bruce Jack
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Colin Humphry Bruce Jack filed Critical Colin Humphry Bruce Jack
Publication of WO1991011676A2 publication Critical patent/WO1991011676A2/en
Publication of WO1991011676A3 publication Critical patent/WO1991011676A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/32—Range-reducing or range-increasing arrangements; Fall-retarding means
    • F42B10/38—Range-increasing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/32—Range-reducing or range-increasing arrangements; Fall-retarding means
    • F42B10/38—Range-increasing arrangements
    • F42B10/40—Range-increasing arrangements with combustion of a slow-burning charge, e.g. fumers, base-bleed projectiles

Abstract

A projectile traversing the lower atmosphere at hypersonic speed suffers high aerodynamic drag. This may be reduced by preheating the air ahead of it to create a 'plasma tunnel', within which the temperature is raised to several times the ambient with a corresponding reduction in density, reducing the drag force. Typically, overall drag may be reduced by a factor of 10-100 in this way. The heating may be accomplished in several ways. For example the projectile may be equipped with a prove attached to the nose through which liquid is sprayed. The liquid is brought to rest by the surrounding air, converting its kinetic energy to heat. A particular application is to electromagnetic space launch systems. A projectile accelerated to orbital or escape velocity at ground level by linear accelerator can traverse the atmosphere with acceptable speed loss.
PCT/GB1991/000111 1990-01-26 1991-01-25 Hypervelocity drag reduction WO1991011676A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909001892A GB9001892D0 (en) 1990-01-26 1990-01-26 A technique for hypervelocity drag reduction by atmospheric heating
GB9001892.0 1990-01-26

Publications (2)

Publication Number Publication Date
WO1991011676A2 WO1991011676A2 (en) 1991-08-08
WO1991011676A3 true WO1991011676A3 (en) 1991-11-14

Family

ID=10670003

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000111 WO1991011676A2 (en) 1990-01-26 1991-01-25 Hypervelocity drag reduction

Country Status (3)

Country Link
AU (1) AU7073291A (en)
GB (1) GB9001892D0 (en)
WO (1) WO1991011676A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6830222B1 (en) 2002-03-21 2004-12-14 Global Aerospace Corporation Balloon device for lowering space object orbits
WO2018081559A1 (en) * 2016-10-27 2018-05-03 Ohio University Air data probe
EP3601939A4 (en) 2017-03-29 2020-12-16 Binek, Lawrence A. Improved bullet, weapon provided with such bullets, kit for assembling the same, and corresponding methods of manufacturing, operating and use associated thereto
CN109250073A (en) * 2018-09-30 2019-01-22 中国人民解放军国防科技大学 Hypersonic aircraft head drag reduction method based on three-electrode spark discharge thermal jet

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022913B (en) * 1954-09-15 1958-01-16 Schoppe Fritz Device for generating propulsion or braking on a body moved relative to a flow means
FR1246710A (en) * 1957-04-08 1960-11-25 Aeronautical mobile
US3345948A (en) * 1965-08-03 1967-10-10 John W Sarvis Projectile
CH480615A (en) * 1966-11-08 1969-10-31 Tech Du Verre Tisse S A R L Laminate material coating layer
US3545212A (en) * 1966-12-15 1970-12-08 Dynamit Nobel Ag Spindle-shaped supersonic projectile with additional propulsion by sternfiring
US4014485A (en) * 1975-04-14 1977-03-29 Martin Marietta Corporation Gas cooling system for hypersonic vehicle nosetip

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022913B (en) * 1954-09-15 1958-01-16 Schoppe Fritz Device for generating propulsion or braking on a body moved relative to a flow means
FR1246710A (en) * 1957-04-08 1960-11-25 Aeronautical mobile
US3345948A (en) * 1965-08-03 1967-10-10 John W Sarvis Projectile
CH480615A (en) * 1966-11-08 1969-10-31 Tech Du Verre Tisse S A R L Laminate material coating layer
US3545212A (en) * 1966-12-15 1970-12-08 Dynamit Nobel Ag Spindle-shaped supersonic projectile with additional propulsion by sternfiring
US4014485A (en) * 1975-04-14 1977-03-29 Martin Marietta Corporation Gas cooling system for hypersonic vehicle nosetip

Also Published As

Publication number Publication date
GB9001892D0 (en) 1990-08-08
WO1991011676A2 (en) 1991-08-08
AU7073291A (en) 1991-08-21

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