SSS.8.1.24 - Suppressed .45 ACP Pistol Hazards - AAC Ti-RANT 45 Silencer Hazard Map Brief
/AAC Ti-RANT 45 on the 1911 Full-Size Semiautomatic .45 ACP Pistol - Hazard Map
This Silencer Hazard Map Brief documents the free field blast overpressure hazards from the AAC Ti-RANT 45 silencer fielded on the 1911 semiautomatic combat handgun firing Speer Lawman 230gr .45 ACP ammunition, as evaluated in technical Report 6.227 and as tabulated in record number 7.1.262 in the Rankings.
The average Suppression Rating hazard contours at 1.6 m silencer end cap elevation from the instrumented blast test of the AAC Ti-RANT 45 silencer computed with the PEW-SOFT HD Blast Hazard Prediction Tool are shown in Figure 1. The Suppression Rating hazard scale is shown in Figure 2. Ground-truth anchored Suppression Ratings from the technical reports are annotated 1.0 m left of the end cap (SR_muzzle) and 6 inches right of the shooter’s right ear (SR_ear) in both figures. Computational parameters and blast overpressure hazard field observations are provided below.
8.1.24.1 PEW-SOFT HD Computational Model Parameters
PEW-SOFT HD code Version 2.2.7 Alpha was used.
Contour elevation is 1.6 m above grade. No reflecting surfaces, other than the ground, are present in the model.
Grid resolution is 0.076 m (3 in).
The average semiautomatic jet stability index sigma_sa of the silencer is 0.78.
8.1.24.2 AAC Ti-RANT 45 Suppression Hazard Map Observations:
The Ti-RANT 45 is a legacy silencer that produces significantly controlled blast load propagation when suppressing .45 ACP. Blast load input amplitude into the silencer may be considered moderate as the barrel length of the 1911 is 5.5 inches long. Blast load output is more focused than from other legacy silencers such as the KAC MOD.MK23/USP.
Personnel risk in both the forward field and rear field near the operator is reduced to levels typically seen with suppressed 9mm pistol systems. The forward jetting is relatively controlled, which gives way to a more focused field forward of the operator. The early time flow rate of the Ti-RANT 45 is higher than some other modern designs, enabling less ejection port blast load propagation, especially when paired with the 1911 pistol which has favorable lock time mechanics. This reduces signature severity to the operator, as shown on the map.
The silencer provides relatively consistent hazard fields after the first shot.
fig 1. AAC Ti-RANT 45 1911 Free Field Hazard Map Produced by PEW-SOFT HD Blast Hazard Prediction Tool using PEW Science Test Data
Fig 2. PEW Science Suppression Rating Scale
