Very-low-drag bullet


Very-low-drag bullet

Very-low-drag bullets (VLD) are primarily a small arms ballistics development of the 1980s–1990s, driven by shooters' desire for bullets that will give a higher degree of accuracy and kinetic efficiency, especially at extended ranges. To achieve this the projectile must minimize air resistance in flight. Demand has been greatest from target shooters, including benchrest competitors, but hunters have also benefited. Most VLD bullets are used in rifles.

Bullets with a low drag coefficient decelerate less rapidly. A low drag coefficient flattens the projectile's trajectory somewhat at long ranges and also markedly decreases the lateral drift caused by crosswinds. The higher remaining velocity of bullets with ballistic coefficients at impact also delivers more kinetic energy.

The development of VLD bullets has focused on the following main factors:
* the production of bullets with concentric and coincident centres of form and centres of mass
* bullet design incorporating a secant ogive, tangent ogive, Von Kármán ogive or Sears-Haack profile in the bullet's nose area
* the use of carefully tapered bullet heels, or boat-tails
* a cavity or hollow in the bullet nose (hollow point) to shift the projectile's centre of gravity rearwards

The resulting projectile should be very "slippery" (well streamlined) for easier passage through the air. Consistency in bullet production, allied to consistency in the assembly of cartridges (quality control) should give excellent shot-to-shot consistency.

The principles of bullet design and flight are classically set out in Mann, F.W.: "The Bullet's Flight From Powder to Target: Ballistics of Small Arms" (1942 and other reprints).

A collection of modern mono-metal solid VLD bullets can be seen at the [http://www.lehighbullets.com/ Lehigh Bullets & Design] , [http://www.lima-wiederladetechnik.de/Englisch/LM-Class-Bullets.htm LM Class Bullets] and [http://www.gsgroup.co.za/sp.html GS Custom Bullets] websites.Alloys like copper nickel, tellurium copper and brass like highly machinable UNS C36000 Free-Cutting Brass are used for turning these projectiles on precision CNC lathes. Producing accurate bullets this way is not easy. To guarantee consistency and hence accuracy professional quality control during and after production is needed. Mono-metal solid bullets are more expensive, when compared to traditional jacketed Hollow Point Boat Tail VLD bullets. Mono-metal bullets offer bullet or projectile designers however more freedom to design CNC lathe machinable slender aerodynamically more efficient bullet shapes that can not be produced with more traditional bullet production methods.

ee also

* Drag (physics)
* Parasitic drag
* Boundary layer
* Drag coefficient
* Ballistic coefficient
* Nose cone design
* Rob Furlong

References

* Mann, F.W.: The Bullet's Flight From Powder to Target: Ballistics of Small Arms (1942 and other reprints)

External links

* [http://bryanlitz.bravehost.com/BulDes.html General Notes on Bullet Design]
* [http://www.jacksonrifles.com/vldvarmints.htm VLD bullets on long-range varmints]
* [http://www.lima-wiederladetechnik.de/Englisch/Haack_minimum_drag_bullet.htm Haack Minimum Drag Bullet]
* [http://www.lima-wiederladetechnik.de/Ballistik/Lilienthal-139-1-Haack.pdf Geschoßformen kleinsten Wellenwiderstandes by W. Haack, Bericht 139 der Lilienthal-Gesellschaft (1941) de icon]
* [http://www.lima-wiederladetechnik.de/PDF/Kneubuehl.pdf What is the Maximum Length of a spinstabilized Projectile? by Mr. Beat Kneubühl]
* [http://www.lima-wiederladetechnik.de/Englisch/LM-Class-Bullets.htm LM Class Bullets, very high BC bullets for windy long Ranges]
* [http://www.lehighbullets.com/ Lehigh Bullets & Design]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Bullet — This article is about firearms projectiles. For other uses, see Bullet (disambiguation). Lead soft point, boat tailed, copper jacketed bullets A bullet is a projectile propelled by a firearm, sling, or air gun. Bullets do not normally contain… …   Wikipedia

  • Drag coefficient — In fluid dynamics, the drag coefficient (commonly denoted as: cd, cx or cw) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment such as air or water. It is used in the drag equation,… …   Wikipedia

  • External ballistics — is the part of the science of ballistics that deals with the behaviour of a non powered projectile in flight. External ballistics is frequently associated with firearms, and deals with the behaviour of the bullet after it exits the barrel and… …   Wikipedia

  • Ballistic coefficient — The ballistic coefficient (BC) of a body is a measure of its ability to overcome air resistance in flight. It is inversely proportional to the deceleration mdash;a high number indicates a low deceleration. BC is a function of mass, diameter, and… …   Wikipedia

  • .408 Chey Tac — Infobox Firearm Cartridge name= .408 Cheyenne Tactical caption= origin= USA type= Rifle service= used by= wars= designer= John Taylor and William O. Wordman design date=2001 manufacturer=Chey Tac production date=2001 ndash;present number=… …   Wikipedia

  • Terminal ballistics — Terminal ballistics, a sub field of ballistics, is the study of the behavior of a projectile when it hits its target. It is often referred to as stopping power when dealing with human or other living targets. Terminal ballistics is as relevant… …   Wikipedia

  • .338 Lapua Magnum — Infobox Firearm Cartridge name=.338 Lapua Magnum caption= .338 Lapua Magnum cartridge case origin=flagcountry|Finland type= Rifle service= used by=Multiple official and civil users wars= Afghanistan War, Iraq War designer= Lapua design date=1989… …   Wikipedia

  • Wolfgang Haack — Wolfgang Siegfried Haack (born April 24, 1902 in Gotha; November 28, 1994 in Berlin) was a German mathematician.LifeWolfgang Haack studied mechanical engineering in Hanover and Mathematics in Jena. There, he earned his doctorate in 1926 at the… …   Wikipedia

  • Sako TRG — Infobox Weapon name= Sako TRG caption=Finnish Defence Forces Sako TRG 42 rifle (8.6 TKIV 2000) origin=flag|Finland type= Sniper rifle is ranged=yes service= 2000 present used by= See operators and civil users wars= Afghanistan War, Iraq War… …   Wikipedia

  • Accuracy International AWM — Infobox Weapon name= Accuracy International AWM caption= German Army AWM F, designated G22 origin=flagcountry|United Kingdom type= Sniper rifle is ranged=yes service= 1997 present used by=Multiple official and civil users wars= Afghanistan War,… …   Wikipedia