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No me había dado tiempo hasta hoy a comentar. Lo vi el viernes en FEINDEF. Sólo decir que la explicación es insuficiente bajo mi punto de vista.paco50 escribió:Solucion al recalentaniento de los fusiles Steyr G-36.
Saludos
"Es la mayor revolución en armamento individual y de escuadra en más de cien años, si llega a efecto. No hay nada parecido desde el lebel 1886.
Lo que se sabe: 6.8mm, bala de alto coeficiente balístico XM1186. Cartucho completo, por determinar, pero posiblemente gane la partida Textron con su munición telescópica y el resto (SiG, GD) está de backup.
Al menos 1000m/s para una bala de 130 grain == posiblemente más de 4000J en boca. La están denominando magnum en círculos especializados aún antes de conocerla.
Para esa presunta energía, el arma es controlable incluso en ráfaga. Eso es lo que se ve, eso y las vainas cayendo, con una longitud superior a la que se conocía para LSAT.
También es importante por donde expulsa las vainas, porque el mecanismo va a ser nuevo, un push-through.
Hasta el cierre y recámara van a innovar, porque suben de 55 Kpsi a 80 kpsi. No se sabe cómo va a absorber el retroceso, pero al menos se ve que el "supresor" no es exactamente tal, porque se ven llamaradas en los lados.
Y han presentado a la vez RFP y mockup del sistema de control de tiro, que es lo que va a poner la guinda del pastel. Medición de distancia, viento, presión, etc., para colocar un punto de mira sintético desplazado según la solución de tiro. Y en breve, gatillo eléctrico opcional, accionado por el control de tiro.
Todo eso es lo que veis . "
The Army has developed a new bolt and barrel system to allow up to 100kpsi cartridges, as well as a next generation of mini assault rifle / PDW's:
https://techlinkcenter.org/us-army-rese ... -firearms/
Aberdeen Proving Ground, Maryland –– Behind the walls of the Combat Capabilities Development Command’s Army Research Laboratory a team of engineers is testing and tweaking a new breech and barrel design that doubles the muzzle velocity of standard-issue rifles.
Among their goals is hypervelocity for extended range lethality from standard sized weapons, and full-sized rifle velocities with firearms that are half the weight, half the length, and hold more ammunition than the Army’s M4 carbine.
In future combat, U.S. soldiers and unmanned systems will defeat soft targets with very short machine guns, or hard targets at long ranges with higher levels of kinetic energy.
One of the weapons being developed is an ultra-light-weight machine gun still in the R&D phase, which will feature a high-capacity magazine (around 50 rounds). Experimental firings were conducted in March with a cartridge that contained less than a gram of propellant (15 grains).The muzzle velocity was over 2,900 feet per second, outperforming similar short barreled weapons like the FN P90, which rates at 2,350 feet per second at the muzzle.
“The goal is to get rifle-like velocities out of a very small weapon that is high capacity, that’s either adaptable for room-clearing or confined spaces,” said Zac Wingard, a mechanical engineer at the lab. “Like you’re getting in and out of vehicles or a subterranean environment, but also applicable for remotely operated systems, so think like perimeter security or ground robot or even a drone.”
“The powder used now in most ammunitions can be tweaked, so it runs at a higher pressure, but the guns can’t handle it,” Michlin said. “That’s why we designed the new breech, so we can take existing propellant and turn the knob all the way up to 11.”
And under the increased pressure, the metallic shell casings tend to stick in the barrel. So, Michlin also invented a collet to surround the cartridge when seated in the chamber. The tapered wedges of the collet reduce extraction forces by 50%, leaving more energy for cycling the bolt.
Tapered-bore guns propel a swageable projectiles propelled down a constricted caliber barrel for high muzzle velocity and reduced aerodynamic drag. This technology was first demonstrated in the 1930s for medium caliber, high-velocity anti-tank guns that were fielded by Germany during World War II. After the war, all tapered bore gun efforts failed to achieve projectile structural integrity, but Army researchers have succeeded and are improving on the tapered-bore design to boost velocity, delivering more energy on target.
But the U.S. Army’s new 24-inch prototype barrel produced muzzle velocities of 4,600 to 5,750 feet per second.
The combustion chamber pressure was increased from 65 ksi to 100 ksi (100,000 pounds per square inch), almost double the pressure seen in the M4 carbine.
Army researchers are also pursuing tapered bore guns to improve the ballistics of very compact, high capacity weapons. By refining projectile aerodynamics and a high capacity prototype gun, Army researchers are realizing a new class of firearms under 15 inches in overall length.
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