Projectile

• US 3,995,558 A
• Filed: 01/02/1975
• Issued: 12/07/1976
• Est. Priority Date: 01/02/1975
• Status: Expired due to Term

• Current Assignee: The United States Of America As Represented By The Secretary Of The Army
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Travor, Bruce W., Johnson, Charles M.
• Primary Examiner(s): Pendegrass, Verlin R.
• Application Number:
  US05/538,052
• Time in Patent Office: 705 Days
• Field of Search: 102/92.1-92.6, 102/105, 244/3.1, 244/3.23
• US Class Current: 102/519
• CPC Class Codes: F42B 10/38 Range-increasing arrangements F42B10/34, F42B14/06 and F42B15/105 take precedence

Abstract

A projectile having mainstream air flow directed to its surface region of rmal air non-attachment during operational flight and in which drag frictional forces in the laminar flow boundary layer region are minimized to produce maximum range. The projectile conical nose has a forward air intake nozzle in fluid communication with a plurality of internal passageways that terminate in outlet ports circumferentially spaced along the rearmost edge of the nose member adjacent the forwardmost external or lateral surface of the projectile main body portion.

Claims

1. In a projectile having a nose tip member threadedly secured to a main body portion having a transverse annular frontal surface, said nose member and said body portion each having a conical lateral surface in substantial mating alignment with each other,

said nose member having means for changing an environmental supply of air to a constant operative reattachmental laminar boundary layer air stream flow over said body portion lateral surface, said changing means including a forwardly opening air intake throat defining nozzle and a plurality of individual unobstructed straight passageways each intersecting and forwardly terminating with the others substantially at the throat of said nozzle and rearwardly terminating in a rearmost outlet port adjacent said body portion conical surface, said passageway ports including diametrically opposed pairs of outlet ports, each pair of outlet ports being diametrically spaced by a distance substantially equal to the diametrical distance across said main body frontal surface.

2. The structure in accordance with claim 1 wherein said passage outlet ports are circumferentially spaced at the rearmost end of said nose member conical surface.

3. The structure of claim 2 wherein said nozzle is defined by a central tapered opening in a forward surface of said nose member.