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CUVX Design – VT Team 2 Page 86limited by yaw and vertical acceleration. The regions in which the vertical acceleration and the angle of yaw exceedthe criteria for VLS launch are shown in the Speed-polar plot. The acceptable operating range requires a heading of150-210 at a speed of 20 knots.ASW and ASUW missions are performed using LAMPS helos. The performance criteria for helo flightoperations are 5 degrees roll and 3 degrees pitch. Vertical velocity at the helo takeoff and landing locations must notexceed 2.5 m/s. The seakeeping analysis indicates that helicopter flight operations are not possible in Sea State 5.The limiting factor for Sea State 5 is the vertical velocity at the aft landing spot. Figure 80 is a Speed-polar plotshowing the helo operating envelope for Sea State 4. Flight operations are possible in Sea State 4 in all conditionsfrom the forward takeoff and landing spot. The vertical velocities at the aft landing and takeoff locations are notwithin operational limits for all conditions. The acceptable operating range from the aft landing spot for Sea State 4requires a heading of 150-210 at a speed of 20 knots.The ISR and SEAD missions are performed by UAVs and UCAVs. The performance criteria for flightoperations are 5 degrees roll, 3 degrees pitch, and vertical velocities at the touchdown and the launch locations mustnot exceed 2.5 m/s. Seakeeping analysis shows that UCAV and UAV flight operations are not possible during SeaState 5 and operation is very limited in Sea State 4. The limiting criteria for UCAV and UAV flight operationsabove Sea State 3 are vertical velocities at the launch point and landing spot. Figure 81 and Figure 82 show theoperating envelope for ISR and SEAD in Sea State 4 and Sea State 3. The acceptable operating range for Sea State4 requires a heading of 175-185 at a speed of 22 knots. The operating range for Sea State 3 requires a heading of135-225 at a speed of 20 knots.The criteria for Underway Replenishment are a maximum roll of 4 degrees or pitch of 1.5 degrees. CUVX isfully operational in Sea State 4 and limited in Sea State 5 and 6. The speed-polar plot for Sea State 5 is shown inFigure 83. A heading of 040-340 (following seas) or 125-235 (head seas) is required to be within the criteria in SeaState 5. The operating envelope for UNREP in Sea State 6 is shown in Figure 84. The ship is able to performunderway replenishment in Sea State 6, but the envelope is very narrow. The ship must be traveling in followingseas at greater than 12 knots or in heads seas at greater than 18 knots.Figure 79. AAW (VLS) Speed-polar Plot for Vertical Acceleration and Yaw in Sea State 6
CUVX Design – VT Team 2 Page 87Figure 80. ASW and ASuW Speed-polar Plot for Vertical Velocity in Sea State 4Figure 81. ISR and SEAD Speed-polar Plot for Vertical Velocity in Sea State 4
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