Trans RINA, Vol 152, Part A2, Intl J Maritime Eng, Apr-Jun 2010 The lift results shown in Figure 11 are highly


encouraging, with values of between 1 and 1.5 for all heights and at only moderate angles of attack.


Figure 12: Coefficient of drag for various heights and angles of attack.


Figure 12 shows the drag results, which are also quite encouraging for lower heights but increase rapidly as the hydrodynamic portion of the hull becomes fully exposed. Likewise, coefficient.


Figure 13 Figure 8: Complete hull form geometry. shows the calculated moment


Figure 13: Coefficient


of moment verses alpha for various heights and angles of attack.


Figure 9: Hull geometry seen from below. Note the diffuser shape integrated with straight planing hulls.


Figure 14: Lift to drag ratio for various heights and angles of attack.


Figure 11: Coefficient of lift verses alpha for various heights and angles of attack.


A - 46


Figure 14 shows the lift to drag ratio for the various heights. At the lowest height, H3, the L/D is nearly 50, which is


an extremely good value. And for the subsequent heights the decrease is initially quite small. ©2010: The Royal Institution of Naval Architects


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