Theory Design Air Cushion Craft 2009 Part 16 pdf

... during 155 with air cushion compartmentation on rigid surface 164 with air cushion compartmentation on water 164 without air cushion compartmentation on water 164 High-performance ... intake for air cushion vehicles. Hovering Craft & Hydrofoil, September 1968. 616 References 97. Tang ZF. Selection and design of lift fans on hovercraft....

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... 137 and cushion height ACV 355 SES 356 coordinate system of craft 167 criteria and standards for stability of SES stability in turns 162 stability in waves 162 static stability 161 -2 damage ... 171-2 factors affecting ACV 168 -72 for ACV 163 -8 in waves 161 on cushion in motion 154-9 with flexible bow/stern seals 154-5 with rigid stern seal 155-6...

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... 45 1.9 SES and ACV design 46 2. Air cushion theory 48 2.1 Introduction 48 2.2 Early air cushion theory developments 50 2.3 Practical formulae for predicting air cushion performance ... propulsion 16. Power unit selection 16. 1 Introduction 16. 2 Powering estimation 16. 3 Diesel engines 16. 4 Gas turbines 16. 5 General design requirements 16. 6...

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... shape of cushion plan. For a rectangular air cushion, p s = 1 and will be the minimum, meanwhile C w will be minimum when the cushion plan is rectangular; therefore an air cushion ... dependent upon the cushion pressure p c . The air leakage from the (a) (c) (d) Fig. 2 .16 Sidewall thickness on various sidewall configurations. 82 Air cushion t...

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... achieve the designer's requirements in the speed range to 40 knots. Above this speed, an air cushion supporting most of the craft weight is most likely to give the optimum design ... post-hump speeds, because a large air flow rate will increase the air component of the two-phase flow blown from the air cushion, producing air lubrication effects...

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... type 717 Item Symbols Dimensions 717 717A 717C Craft weight Cushion length Cushion beam Cushion lib ratio Cushion pressure length ratio Cushion pressure Flow coefficient VCG Bow and ... rigid surface whatever type of cushion compartment was adopted. 3 en Fig. 4.34 Static transverse stability of ACV models with + type of air cushion compartmentation. 170 S...

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... deformation in SES air cushion 197 Fig. 5.8 Wave amplitude due to an ACV on shallow water in/off air cushion. 5.3 Water surface deformation in/beyond SES air cushion on calm ... to air cushion and skirt F c = jetted thrust due to air leakage from cushion during turning manoeuvre F m = air momentum force z m = distance from ground to the cent...

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... the cushion pres- sure acting on the stern skirt is uniformly distributed, may not be accurate, particu- larly in the case where craft are running on a water surface. Cushion air ... restoring force reduces quickly. The Sedam series of craft had cushions with a series of jupes. The highly compartmented cushion provided great heave, pitch and roll stabil...

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... when the craft is running in high seas and the vertical motion of the craft is very large. In such a case, we can consider air leakage gap, air cushion pressure and air flow rate ... along the longitudinal craft axis. Particularly when the craft is running in high seas, wave perturbations on the craft are severe and this causes local air le...

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... tank. Part of the outflow may be led directly into the cushion and another part via air ducts, the bow/stern bag and through into the air cushion. The distribution of air flow ... of air leakage and compressibility of cush- ion air will affect the change of cushion pressure and flow rate. Figure 8.42 shows such dependency between the craft dra...

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