Theory Design Air Cushion Craft 2009 Part 17 pdf

... design 474, 476 Platforming 73-4, 74 analysis 74-6 Pleasure craft 44 Plenum chamber cushion 8, 52 on rigid surface 51-2 theory 72 Plough-in 173 -85, 174 , 182, 325 at high speed 177 -85 boundary ... 629 SR.N5 13, 76, 173 SR.N6 13, 14, 15, 86, 173 , 174 , 176 , 214, 361, 418 overturning 186 plough-in boundary 186 SR.N6-012 185 Stability 135-86 acceptable 137...

Ngày tải lên: 11/08/2014, 18:20

... bow/stern seal 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 ... Marine Hovercraft. NPL Hovercraft Unit Report No. 11, 1969. 16. Beardsley MW. Wave Pumping and its Effect on the Design and Operation of Air Cushion Shi...

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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 ... invention to first application (years) Steam boat 41 Hydrofoil craft 35 Submarine 25 Hovercraft 13 Jet aircraft 12 Aircraft 8 hovercraft, focussing on the UK, form...

Ngày tải lên: 11/08/2014, 18:20

... 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 ... wave-making drag due to air cushion, (N), p c the cushion pressure (N/m ), B c the cushion beam, (m), l c the cushion length (m), p w the water mass density (...

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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...

Ngày tải lên: 11/08/2014, 18:20

... particulars for three SES 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 ... surface whatever type of cushion compartment was adopted. 3 en Fig. 4.34 Static transverse stability of ACV models with + type of air cushion com...

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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...

Ngày tải lên: 11/08/2014, 18:20

... 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...

Ngày tải lên: 11/08/2014, 18:20

... 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...

Ngày tải lên: 11/08/2014, 18:20

... 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...

Ngày tải lên: 11/08/2014, 18:20