US 3902424 A
A flechette small caliber projectile providing tracer visibility capability during flight while ballistically trajectory matching a small caliber ball flechette and retaining a high velocity low drag profile. Tracer material is located in a rearwardly opening internal cavity provided in the flechette projectile cylindrical body portion. Fin stabilizers surround or extend radially outward of the tracer cavity.
Claims available in
Description (OCR text may contain errors)
United States Patent Dietsch et al.
PROJECTILE Inventors: Francis W. Dietsch, Levittown;
Ronald D. DiGirolamo, Philadelphia, both of Pa.
The United States of America as Dec. 7, 1973 App]. No.: 423,048
 US. Cl. 102/87; lO2/93; lOZ/DIG. 7  Int. Cl. F42B 11/16  Field of Search lO2/DIG. 7, 38, 93, 87
 References Cited UNITED STATES PATENTS 219,881 9/l879 Streeter 244/323 2,115,047 4/1938 Stevenson... 102/87 2.4()9,427 lO/l946 Fonberg 1 244/323 2,4l2,266 l2/l946 Hoagland 244/323 3,033.1 l6 5/1962 Critcher et al.. lO2/DlG. 7 X 3.l48,472 9/1964 Heggc et al lOZ/DlG. 7 X 3,401,636 9/1968 Ciccone et al l02/DlG. 7 X
OTHER PUBLICATIONS Fin Stabilization or Spin Major Hobart Ordnance Weapons Technology Jan-Feb. 1973.
Primary ExaminerStephen C. Bentley Assistant ExaminerHarold Tudor Attorney, Agent, or Firm-Nathan Edelberg; Robert P. Gibson [5 7} ABSTRACT A flechette small caliber projectile providing tracer visibility capability during flight while ballistically trajectory matching a small caliber ball flechette and retaining a high velocity low drag profile. Tracer material is located in a rearwardly opening internal cavity provided in the flechette projectile cylindrical body mporltion. Fin stabilizers surround or extend radially outward of the tracer cavity.
' 1 Claim, 2 Drawing Figures PROJEC'IILE The invention described herein may be manufactured. used and licensed by or for the Government for governmental purposes without the payment to us of any royalty thereon.
This invention relates to projectiles, and more particularly to a small caliber flechette-type projectile.
It is an object of the invention to provide a small caliber flechette projectile having tracer visibility capability during its flight.
Another object of the invention is to provide such a projectile that will have ballistic trajectory equivalent to that of a small caliber ball flechette projectile.
A further object of the invention is to provide such a projectile that retains a high velocity low drag profile.
These and other objects. features and advantages will become more apparent from the following description and accompanying drawings in which:
FIG. 1 is an elevational view. paratially broken away in section. ofa preferred projectile embodying the principles of the invention. J
FIG. 2 is a sectional view taken along lines 2-2 of FIG. 1.
The small caliber flechette projectile. shown generally at (FlG.l has a forward nose portion I] and a substantially cylindrical rearward portion l2 (FIGS. 1, 2 carrying a plurality of fin stabilizers 13 at the rearmost end of the projectile. Surrounding the forward portion of the projectile. particularly at the tapered nose I1. is a plurality of segmental sabot portions l4 held in pre-flight position by an appropriate rubber sealing ring [5. The sabot has its own tapered nose and. after the projectile is fired from a suitable gun muzzle. its multiple segmental portions 14 are released and rapidly fall away from the projectile due to the operative expanding and rupturing of sealing ring 15.
Preferably. the fin stabilizers 13. which extend substantially radially outward from the rearward end ofcylindrical portion 12. are each formed to incline at a slight angle (approximately 1.5") to the longitudinal axis of the projectile to facilitate imparting spin to the launched projectile.
The projectile cylindrical portion 12 is provided with a rcarwardly opening. longitudinally extending. drilled internal tracer cavity 16 in which is located, preferably.
an elongated tube 17 of tracer material 18 and a somewhat shorter length of tubing 19 containing igniter material 20 (FIG. 2). The igniter tube I9 is located at the rearward end of the cavity 16 and held in position thcrebetween by an appropriate deforming action provided on the rearmost end of the then filled hollow cylindrical portion 12. The preferred means of deforming the rearward end of cylindrical portion 12 is by crimping with an appropriate crimping tool positioned at predetermined peripheral locations between rearmost portions of adjacent ones of the outwardly extending fins l3. Preferably. the projectile cylindrical portion 12 has an external diameter of 0.l inches. its cavity 16 has a recessed or drilled surface diameter of 0.06 inches. and the span across a pair of substantially diametrically opposed fins IB is 0.2 inches.
Various modifications. changes or alterations may be resorted to without departing from the scope of the invention as defined in the appended claims.
1. In a flechette projectile arrangement having a substantially pointed forward nose portionQa substantially cylindrical rearwardmost portion. and 'an intermediate substantially cylindrical portion.
said rearmos portion having a diameter greater than that of said inttgrmediate portion. I said cylindrical rearwardmost portion having a pluarlity of fin stabilizers extending radially outward l therefrom and a rearwaidly opening longitudinally extending internal tracer cavity. said cavity having a forward wall located rearward of said intermediate cylindrical portion.
a tube of tracer material in said cavity. y a multiple segmented sabot surrounding said nose portion.
tube. for retaining said tracer tube in said cavity.