Projectile

• US 8,893,621 B1
• Filed: 12/07/2013
• Issued: 11/25/2014
• Est. Priority Date: 12/07/2013
• Status: Active Grant

• Current Assignee: Rolando Escobar
• Original Assignee: Rolando Escobar
• Inventors: Escobar, Rolando
• Primary Examiner(s): Hayes, Bret
• Assistant Examiner(s): MORGAN, DERRICK R
• Application Number:
  US14/099,944
• Time in Patent Office: 353 Days
• Field of Search: 102/439, 102/490, 102/501, 102/506, 102/507, 102/508, 102/509, 102/514, 102/524
• US Class Current: 102/503
• CPC Class Codes: F42B 10/44 Boat-tails specially adapted for drag reduction

Abstract

A projectile comprised of an ogive section, a bearing surface section and a boattail section. A cavity is formed inside the projectile from an aperture on the aft end of the boattail section and forward to about the transition point (shoulder) between the ogive section and bearing surface section. The cavity is centered about the centerline of the projectile and open on the aft end of the projectile.

Claims

1. A projectile having an ogive section (14) forward of a bearing surface section (16) forward of a boattail section (18);

an aft end of the projectile is at an aft end of the boattail section (18) at a base (20);

the projectile is rotationally symmetrical;

a rotationally symmetrical cavity (28) is positioned inside the projectile and has a depth (31) bounded at a fore end at a bottom (32) and at an aft end at the base (20);

the cavity (28) is open on the aft end of the boattail section (18) at an aperture (40) formed in the base (20);

the bearing surface section (16) has a first diameter;

the bottom (32) as a second diameter;

the aperture (40) has a third diameter;

the base (20) has a fourth diameter;

the boattail section (18) has a first length;

the bearing surface section (16) has a second length;

the depth (31) has a third length;

the first diameter is constant from a fore end to an aft end of the bearing surface section (16);

the second diameter that is less than or equal to the third diameter and greater than or equal to about a quarter of the fourth diameter;

the third diameter is less than or equal to the fourth diameter;

the fourth diameter is less than or equal to fifty-five percent of the first diameter;

the third length is between eighty-five percent and one hundred twenty-five percent of the sum of the first length and the second length.

2. A projectile as in claim 1 further characterized in that the first length is greater than or equal to the third diameter and is less than or equal to two hundred percent of the third diameter.

3. A projectile as in claim 1 further characterized in that the first length is greater than or equal to the first diameter and is less than or equal to one hundred fifty percent of the first diameter.

4. A projectile having an ogive forward of a bearing surface forward of a boattail;

a cavity is formed on an interior of the projectile;

the cavity has a closed fore end terminating inside the projectile and an open aft end at an aperture on an aft end of the boattail;

the projectile and cavity are both rotationally symmetrical about a centerline of the projectile;

the boattail has a first length from a fore end of the boattail to an aft end of the boattail;

at the aft end of the boattail is a base;

the bearing surface has a second length from a fore end of the bearing surface to an aft end of the bearing surface;

the cavity has a third length from the closed fore end to the open aft end;

the bearing surface has a constant first diameter along the entire second length;

the fore end of the cavity as a second diameter;

the aperture has a third diameter;

the base has a fourth diameter;

the first length is between one hundred fifty percent and two hundred fifty percent of the third diameter;

the third length is between eighty-five percent and one hundred twenty-five percent of the sum of the first length and second length;

the third diameter is between sixty-five percent and one hundred percent of the fourth diameter;

the fourth diameter is between forty and sixty percent of the first diameter;

the second diameter is less than or equal to the third diameter.

5. A projectile having an ogive section forward of a smooth, symmetrically cylindrical bearing surface section forward of a boattail section;

a shoulder is where the ogive section transitions into the bearing surface section;

an aft end of the boattail section terminates on an aft end of the projectile at a base;

the bearing surface has a bearing surface diameter that is consistent from a forward side of the bearing surface to an aft side of the bearing surface;

the base has a base diameter that is between forty-five and fifty-five percent of the bearing surface diameter;

the projectile has an overall length that is a sum of an ogive section length and a bearing surface section length and a boattail section length;

the boattail section length is between twenty to thirty percent of the overall length;

the shoulder is then determined to be at any given point forward from the difference of the overall length and a boattail length;

the bearing surface length is then derived to be from the shoulder to the forward end of the boattail where it transitions into a boattail section;

the nose length is then determined to be from the shoulder to a tip derived from the overall length less the sum of the bearing surface length and boattail length;

a cavity is formed rotationally symmetrical inside the projectile and is bounded by the base at an aperture and at a forward end at a bottom;

the bottom is positioned within ten percent of the overall length measured forward or aft from the shoulder;

the bottom has a bottom diameter that is between twenty-five and one-hundred percent of the base diameter;

the bottom diameter is less than or equal to an aperture diameter;

the aperture diameter is equal to the base diameter less 20 percent of the bearing surface.

6. A projectile which is transonically stable for any given predetermined bearing surface diameter or caliber (42) with any given predetermined overall projectile length, comprising:

a projectile of any given predetermined overall projectile length is a sum of an ogive nose section length (14) (62) from a tip (38) or (66) and a bearing surface section length (16) (60) and a boattail section length (18) (64);

a projectile of any given predetermined bearing surface diameter or caliber (42);

a projectile having an ogive nose section (14) (62) forward of a bearing surface section (16) (60) forward of a boattail section (18) (64);

a shoulder (24) where the ogive nose section (14) (62) transitions into the bearing surface section (16) (60);

an aft end of the boattail section (18) (64) which terminates on an aft end of the projectile at a base (20) or heel (26);

a bearing surface (16) (60) that has a bearing surface diameter that is consistent from a forward side of the bearing surface to an aft side of the bearing surface;

base (20) with a base diameter (20) that is between forty-five and fifty-five percent of the bearing surface diameter or caliber (42);

a boattail section length (18) (64) that is between twenty to thirty percent of the overall projectile length from the tip (38) or (66) to the base (20) or heel (26);

a shoulder (24) that is determined to be at any given point forward from a difference of the overall projectile length and the boattail section length (18) (64);

a bearing surface length (16) (60) that is determined to be from the shoulder (24) to a forward end of the boattail where it transitions into the boattail section (18) (64);

a nose length (14) (62) that is determined to be from the shoulder (24) to the tip (38) or (66) derived from the overall projectile length less a sum of the bearing surface length (16) (60) and boattail length (18) (64);

a cavity (28) that is formed rotationally symmetrical inside the projectile and is bounded by the base (20) or heel (26) at an aperture (40) and at a forward end at a bottom (32);

a cavity (28) with an aperture (40) that is open to the inside of a case cartridge when used in a firearm, that proportionally compensates for displaced powder volume by the projectile in the case cartridge at any position;

a bottom (32) that is positioned within ten percent of the overall projectile length measured forward or aft from the shoulder (24);

a bottom (32) that has a bottom diameter (32) with a range that is from equal to the base diameter to greater than or equal to twenty-five percent of the base diameter (20);

a bottom diameter (32) that is less than or equal to an aperture diameter (40);

an aperture (40) has a diameter range that is less than the base diameter (20) and is greater than or equal to the base diameter (20) less 25 percent of the bearing surface diameter or caliber (42);

wherein the only other additionally applicable ranges to any said ranges or proportions are plus or minus 0.010 of an inch and then rounded up or down to a hundredth of an inch.