Trans RINA, Vol 152, Part B2, Intl J Small Craft Tech, 2010 Jul-Dec
for systematic series of high speed planing craft is even more limited. The most significant series is the prismatic hull series tested by Fridsma [9, 10] and extended by Zarnick [11]. Other tests of high speed planing craft in waves include those carried out by Rosen and Garme [12-14]. The models tested in these calm water resistance and seakeeping tests are either prismatic forms, or are not representative of modern high speed hull forms. In light of this a new series of hull specifically for this investigation.
forms was designed
In order that this series be representative of modern design practice, a survey of built high speed military and para-military interceptor craft and Union Internationale Motonautique
(U.I.M) Powerboat P1 boats was
undertaken. This survey, summarised in table 1, shows that typical L/B values range from 3.7 to 5.8. These parameters were borne in mind when designing the series described here.
Vessel Chaudron 33
LOA [m]
10.1 B [m] CMN Interceptor DV15 15.5 3.0 T [m] L/B
2.2 - 4.6 0.8
5.2
Damen Interceptor 1202 11.6 2.5 1.7 4.7 Damen Interceptor 1503 15.0 2.7 1.7 5.6 Damen Interceptor 2004 20.0 4.5 2.5 4.4 Damen Interceptor 2604 26.1 6.0 3.1 4.4 Donzi 38 ZR Comp Dragon 39
FB 42' poker run FB 48 STAB
FB Design FB38 FB Design FB42 FB Design FB55 FB Design FB80
11.9 12.9
11.6 2.8 2.6
0.7
12.8 3.1 - 11.9 2.3 -
4.1 0.9 4.6
2.6 - 5.0 4.2 5.1
Formula 382 FASTECH 11.6 Fountain Lightning 42 Hustler 388 Slingshot
Metamarine TNT 46 Corsa
Rodriguez V6000 Storebro 90E
Sunseeker XS Sport VT Enforcer 33 VT Enforcer 40 VT Enforcer 46
14.6 11.9
13.0 2.6 1.0 4.9 16.6 2.9 1.2 5.8 24.0 6.0 - 2.5
4.0
12.8 2.6 11.8
0.8 4.6 1.0
0.6 5.2
16.5 2.8 - 5.8 10.8 2.9 0.7 3.7 2.3
10.1 2.6 12.2 2.7 13.9 2.8
0.8 5.1 0.7
0.8 0.9
3.9 4.4 5.0
Table 1: Survey of Interceptor and P1 boat dimensions.
Details of the model series designed for this study are shown in table 22. The body plan and profile of the models
respectively. Variants of model C having one and two transverse steps are designated as models C1 and C2, respectively. These steps are perpendicular to the centreline of the models, as shown in figure 2.
B-56 in the series are shown in figure 1 and 2,
Length: 198m Breadth: 4.57m Depth:
1.68m Maximum Carriage Speed: 15m/s ©2010: The Royal Institution of Naval Architects 4.9
2.6 - 4.5 2.8
All of the models were constructed from foam and painted with primer before being sanded with 800g/m2 wet and dry paper. A maximum model weight of 50 percent of the displacement was specified in order to ballast the models to achieve the required pitch radius of gyration for subsequent testing in head waves.
The parent hull, designated model C, is typical of high speed interceptor craft and race boats. The model has a L/B ratio of 4.3 and a transom deadrise angle of 22.5o. The hullform was modified to remove the two transverse steps and the two spray rails often seen on such craft.
The variation in L/B ratio and speeds tested for the developed model
series are compared to previous
experimental investigations of planing craft performance in table 3. It may be seen that the experiments conducted extend the speed range for which data are available.
Model A B 2.0 2.0 0.32 0.39 0.06 0.08
L[m] B[m] T[m] Δ[N]
L/∇1/3 L/B β[Ο]
LCG [%]
C D 2.0
0.46 0.09
6.86 4.35 22.5 0.33
2.0
0.53 0.11
119.25 175.83 243.40 321.95 8.70 7.64 6.25 5.13 22.5 22.5 0.33 0.33
6.25 3.77 22.5 0.33
Table 2: model details.
The models were towed by a single free-to-heave post, with yaw restraint, attached at the longitudinal centre of gravity by a free-to-pitch fitting. All models were towed from a height of 1.1 times the draught above the keel (i.e. 1.1T). As the models
are not representative of a
particular vessel, the propulsor was not known. It was therefore assumed that the thrust line passed through the centre of gravity and that the thrust acts horizontally. No correction moment was therefore applied to correct for the thrust lever. The models were tested at a number of static trim angles.
Similarly, without a full-scale design length or speed, it was not possible to apply a correction moment for the skin friction resistance (δRF).
3 FACILITIES AND TESTS 3.1 FACILITIES
All of the experiments were conducted in the GKN Westland Aerospace No.3 Test Tank, at their test facilities in Cowes on the Isle of Wight. The tank has the following principal dimensions:
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