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CUVX Design – VT Team 2 Page 52Capacities for weapons magazines are specified in the Concept Baseline characteristics to support UCAVs,LAMPs, and ship weapons. Considerations for placement of weapons magazines include redundancy, survivability,and weight distribution. The placement of weapons magazines is also driven by the location of weapons elevators tosupport weapons load-out on Hangar Deck 1 as shown in Figure 33.4.2 Hull Form, Appendages and Deck House4.2.1 Hull FormThe baseline Concept Development hullform was created using FastShip software in conjunction with FastGen.The principle dimensions of a parametric model of LPD-17 including length, beam, depth, draft, prismaticcoefficient, cross sectional coefficient, and block coefficient were modified using Parametric FastShip macros.These dimensions were iterated to achieve the values specified for CUVX HI3 by the optimization in ConceptExploration as listed in Table 34.Table 34. CUVX HI3 Hullform CharacteristicsLPD-17 CUVX HI3LWL 200 m 213 mB 29.51 m 29.04 mD 19.0 m 29.58 mT 7.00 m 7.01 mC P .647 .702C X .941 .95C B .609 .667A wave-piercing tumblehome (WPTH) hullform was selected for CUVX HI3 in Concept Exploration. Themodified LPD hullform was left untouched below the waterline except for reshaping the bulbous bow into a wavepiercingbow. Above the waterline the hullform was modified to have a tumblehome of ten degrees to reduce radarcross section (RCS). Figure 36 shows this modification. A hard chine was created at the waterline where singlecurvature or flat angled plates on the side of the ship meet the round bilge radius. This also improves theproducibility of the design. The transom was modified to have a ten degree incline, as shown in Figure 37.Figure 36. CUVX Body ViewFigure 37. CUVX Isometric View of TransomThe bow was raked back at forty degrees as shown in Figure 38 to give good wave piercing qualities. Thisangle and shape were estimated based on expert opinion and comparison to pictures and drawings of wave-piercingtumblehome hullforms in the literature. Detailed hullform data is proprietary and could not be obtained. Because nodata was available, a model was built and a resistance test performed to measure the resistance of this hullform andcompare to the estimate made in Concept Exploration. This is described in Appendix D.3 .
CUVX Design – VT Team 2 Page 53Figure 38. Profile close-up of bow sectionConcept Exploration specified the requirement for simultaneous takeoff and landing in CUVX HI3. Due to theLWL constraints and launch/recovery distance requirements specified by the VT UCAV-N team, launch andrecovery could not be incorporated on the single weather deck. It is only possible using two separate decks. Thisvaries from traditional CVN launch and recovery and is therefore high risk. The weather deck was selected as therecovery deck and the hullform and sheer line were modified to incorporate a launch deck below the recovery deck,angled up and off the bow of the ship. Working with the VT UCAV-N team, a ramp launch was found to decreasethe launch distance required by imparting a vertical component to the launch velocity and giving the UCAV-N amore optimal launch angle of attack. An angle of 3 degrees was chosen because it fit best the ship geometry. Thisdecrease in strip length is very valuable in terms of added hangar deck area. Figure 39 shows a labeled profile viewof the finished baseline hullform concept. Figure 40 shows CUVX HI3’s floodable length curve. Figure 41 showsthe curves of form for CUVX HI3. Also see attached lines drawings.Figure 39. CUVX HI3 wave piercing tumblehome in profile viewFigure 40. Floodable Length Curve
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