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NSFS: Weapon System Comparison

NSFS: Weapon System Comparison. Shore Lines, Coverage Areas, Firing Rates and Cycle Time. Agenda. Simplified geometry of the problem Relationship among maximum range, standoff distance and coverage area Data on weapons systems (platform agnostic) Maximum volume of fires available. R DDG-1K.

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NSFS: Weapon System Comparison

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  1. NSFS: Weapon System Comparison Shore Lines, Coverage Areas, Firing Rates and Cycle Time

  2. Agenda • Simplified geometry of the problem • Relationship among maximum range, standoff distance and coverage area • Data on weapons systems (platform agnostic) • Maximum volume of fires available

  3. RDDG-1K RDDG-51 rSTS rSTS Simplified Geometry RDDG-51= Range of 5”/62 on BURKE Class RDDG-1K= Range of AGS on ZUMWALT Class rSTS= Distance from ship to notional shoreline • Distance between fore and aft firing points is ignored • Gun line assumed parallel to absurdly straight shoreline • Shoreline is a chord in ship’s range circle  coverage area for each platform

  4. Calculating the Coverage Area Coverage Area =R2-Tan-1[√(R/r)-1]-r√R2-r2 • R is the maximum range of the NSFS platform • r is the range from ship to shoreline • As rR, A0 • As r0, A=1/2πR2 • Math is shown here

  5. Coverage Area Results Note: Table assumes that either ERGM or BTEM completes development and is deployed for use with 5”/62 Mk 45 Mod 4; and that AGS range reaches threshold

  6. Firing Rates and Cycle Times • AGS fires 10 rounds/minute, sustained; almost equal to the rate of fire for a six gun battery of howitzers, each firing 2 rounds/minute • 5”/62 Mk 45 Mod 4 has a sustained rate of fire ~16 rounds per minute • Cross section comparison*: • 127 mm (5”) round: 19.6 in2 • 155 mm (6.1”) round: 29.2 in2 • AGS has ~48% larger cross section • 16 hours to reload the magazines of a BURKE Class (DDG-51) destroyer during UNREP (http://www.navweaps.com/Weapons/WNUS_5-62_mk45.htm) *Note: ratio of cylinder cross section is a crude proxy for warhead weight

  7. Volume Fires: Net Explosive Weight • Define one unit of fire = 5” round • For the 5”/62 Mk 45 Mod 4 • NEWMk45 rate = 16 rounds/minute * 1 UOF/round • 16 UOF/minute • For the AGS • NEWAGS rate = 10 rounds/minute * 1.48 UOF/round • 14.8 UOF/minute • Ratio of NEW delivery rates (AGS: 5”/62): • 14.8:16 = 0.925 • AGS throws a larger round, but at a slower rate • What effect does this have on its advantage in coverage area, due to greater range?

  8. Coverage Area –v- NEW rate Despite the slower rate of fire, the weight and range advantages of the AGS dominate the Mk 45 Mod 4

  9. Back to brief

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