CUVX Design Report - the AOE home page - Virginia Tech

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CUVX Design – VT Team 2 Page 128LAUNCH DK RECOVERY DK FLT DK HANGAR HULL DH HULLSSCS GROUP AREA (m2) AREA (m2) AREA (m2) AREA (m2) AREA (m2) AREA (m2) VOLUME (m3)3.6 SHIP MAINTENANCE 0.00 0.00 461.04 0.00 990.663.61 ENGINEERING DEPT 0 0 330.22 0.00 598.23.611 AUX (FILTER CLEANING) 0 0 28.40 0.00 85.203.612 ELECTRICAL 0 0 66.80 0.00 200.403.613 MECH (GENERAL WK SHOP) 0 0 94.00 0.00 282.003.614 PROPULSION MAINTENANCE 0 0 10.20 0.00 30.603.62 SHIP OPERATIONS DEPT (ELECT SHOP) 0 0 4.40 0.00 13.203.63 SHIP WEAPONS DEPT (ORDINANCE SHOP) 0 0 64.42 0.00 193.263.64 DECK DEPT (CARPENTER SHOP) 0 0 62.00 0.00 186.003.7 STOWAGE 0 0 787.87 0 2363.613.71 SUPPLY DEPT 0 0 721.17 0 2163.513.711 HAZARDOUS MATL (FLAM LIQ) 0 0 80.67 0.00 242.013.712 SPECIAL CLOTHING 0 0 38.00 0.00 114.003.713 GEN USE CONSUM+REPAIR PART 0 0 489.50 0.00 1468.503.714 SHIP STORE STORES 0 0 113.00 0.00 339.003.715 STORES HANDLING 0 0 0.00 0.00 0.003.72 ENGINEERING DEPT 0 0 15.00 0.00 45.003.73 OPERATIONS DEPT 0 0 4.40 0.00 13.203.74 DECK DEPT (BOATSWAIN STORES) 0 0 39.10 0.00 117.303.75 WEAPONS DEPT 0 0 2.80 0.00 8.403.76 EXEC DEPT (MASTER-AT-ARMS STOR) 0 0 3.30 0.00 9.903.78 CLEANING GEAR STOWAGE 0 0 2.10 0.00 6.303.8 ACCESS 0.00 0.00 2029.90 0.00 6089.703.82 INTERIOR 0.00 0.00 2029.90 0.00 6089.703.821 NORMAL ACCESS 0 0 2000.00 0.00 6000.003.822 ESCAPE ACCESS 0 0 29.90 0.00 89.703.9 TANKS 0 0 668.13 0 3200.7113.91 SHIP PROP SYS TANKS 0 0 0 0 1910.493.911 SHIP ENDUR FUEL TANKS 0 0 0 0 1889.673.9112 FUEL OR BALLAST TANK (COMPENSATED) 0 0 0 0 1889.673.912 LUBE OIL TANKS 0 0 0 0 20.823.92 SW BALLAST TNKG 0 0 0 0 359.043.93 POTABLE WATER TNKG 0 0 0 0 420.1813.941 SEWAGE TANKS 0 0 0 0 698.73.942 OILY WASTE TANKS 0 0 0 0 37.7933.95 VOIDS 0 0 47.13 0 4903.96 COFFERDAMS 0 0 21 0 213.98 UN OCCUPIED SPACES / EMPTY TANKS 0 0 600 0 18004 SHIP MACHINERY SYSTEM 0 0 52.92 0 11355.754.1 PROPULSION SYSTEM 0 0 52.92 0 9128.68BASIC MACHINERY 0 0 0 0 8940.944.13 INTERNAL COMBUSTION 0 0 52.92 0 187.744.133 EXHAUST 0 0 62.58 0 187.744.3 AUX MACHINERY 0 0 0 0 2227.074.31 GENERAL (AUX MACH DELTA) 0 0 0 0 2227.07D.6 Resistance Model TestingModel ConstructionA scale of 100:1 is used for the model. The overall length of the model is 213 cm, the maximum that caneffectively be tested in the Virginia Tech ESM towing tank. A 2 meter model is also realistic for our constructionabilities and available tooling.The model construction method was to frame the hull at its stations much like building a small wooden boat.Stations templates were traced onto balsa frames. Several stations were added in areas where there was morecurvature to better define the model surface. Holes were drilled through the frames along a grid that was previouslymarked with pinholes. The frames were connected using wooded dowels through these holes.Liquid expanding foam was poured between the frames to create workable surfaces. To contain the liquidexpanding foam, a disposable mold was constructed. This mold was made out of cardboard and was roughly theshape of the upside-down hull. Hot glue and duct tape were used to seal the mold. The top of the mold was left opento allow for extra expansion of the foam. Foam was added batch by batch to the mold until it was full as shown inFigure 1. Once the mold was filled and the foam was allowed to dry fully, the cardboard mold was cut away.Sanding boards with higher grit paper, such as 120 or 180, were used to sand through the foam until the frames werereached. This created a surface between the frames that was approximately fair and geometrically similar to ouractual hullform.After fairing, the model was coated with a surface primer. This primer is intended to achieve a watertight sealand also, by applying thick layers, add rigidity to the model.TestingThe model was tested in Virginia Tech’s small student towing tank. To obtain proper trim and displacement, themodel was placed in the towing tank and observed. It showed a small amount of trim at the stern and the model was
CUVX Design – VT Team 2 Page 129too light. Holes were drilled in the model and weights were placed at locations equidistant from the models’ CGalong the centerline. This was done to sink the model to the design waterline and to correctly trim the model.The model was towed using a wire tow line. To measure drag force, the tow line was connected from aneyehook on the model to a strain gage balance located underneath the carriage, Figure 2. The model was towed atspeeds scaled to correspond to required ship speeds. Figure 3 and 4 show two model test runs. The color is invertedin Figure 3 to enable better viewing of the waves.After reviewing the results it was concluded that the due to the unsophisticated test techniques and the smallmodel size, the Holtrop-Mennen resistance prediction provided more reasonable results. Building and testing themodel was a good educational experience, but it was understood at the start that the results would be suspect.Figure 1. Foam surface being added to model frame structureFigure 2. Tow Tank Apparatus and Model Ship
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