Theory Design Air Cushion Craft 2009 Part 8 ppsx

... 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 ... change of density of cushion air (g v ), i.e. due to the compressibility of the air cushion. In this case, we assume the change of air density in the cushi...

Ngày tải lên: 11/08/2014, 18:20

... /s m m m m 26.5 281 3 5.115 0.5254 0.2066 0. 086 0. 086 33.1 44.2 2 789 2776 5.115 5.165 0. 582 3 0.5952 0.20 08 0.1 986 0. 085 8 0. 086 8 0. 086 6 0. 086 8 55.2 2 787 5.15 0.5599 0.2006 0. 089 0. 089 174 Stability Fig. ... width W 4 fi c lJB e PA PC Q KG Z b,s a ft 5, t m m kgf/m N/m 2 m m deg deg m 13.7 13.2 3.5 3.77 19.93 2630 0.00757 1.27 0.15 60 89 0.12 15.95 15.2 3.5 4.3...

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 ... of almost circular trunks inflated iop b , extended to between 60 and 80 % of cushion depth. For deep cushion craft, inflated cones (sim- ilar to chip-bag segments) may be...

Ngày tải lên: 11/08/2014, 18:20

... 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 ... of Construction 1960 1965 1970 1975 1 980 1 983 Craft SR.N1 SR.N5 BH.7 SR.N4 SR.N4 Mk3 API. 88 Engine Aircraft, piston Gas turbine Gas turbine Gas turbine Gas turbin...

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 ... 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...

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... tank. fl(x9.8N) 10 A / • ' / \ ^ Vr~~'' -— O - —A- / // ^^ r if "^ ^-| iiiiiiini _\ i \ t t W n (mm) (X9.8N) (r/min) - 60 87 .8 10000 — 40 87 .8 10000 20 87 .8 10000 Fig. ... 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 g...

Ngày tải lên: 11/08/2014, 18:20

... 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 cen...

Ngày tải lên: 11/08/2014, 18:20

... 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 drag and air ... with two air ducts from the air outlet of the fan have been carried out in the towing tank. Part of the outflow may be led directly into the cushion and another part...

Ngày tải lên: 11/08/2014, 18:20

... 1960 China 1 18 105-107 110 Hydrofoil Design China 1 18 73 80 63 717C SES China 83 80 89 719 SES China 122 85 98 80 719-11 SES China 114 73 80 65 711-IID ACV China 95 Griffon ACV UK 102 85 AP1 .88 ACV UK 88 88 78 W 120 Catamaran Norway 72 79 Rules USSR 90-95 50 55-60 Rules Japan 95 70 -80 65 Stability ... cabin Rear of passenger cabin Bridge/wheelhouse 94 96 93 92...

Ngày tải lên: 11/08/2014, 18:20

... Hovercraft Craft Country Type Cushion Cushion Craft Cushion Flow Q bar length area weight ^(t) pressure rate 4(m) 5 c (m 2 ) /> c (N/m 2 ) Q (mVs) HM.216 UK SES 11.95 58. 29 18. 38 3570 ... 18. 38 3570 29 .80 0.0067 HM.2 18 UK SES 14.39 70.19 27.30 3390 21.50 0.00412 HM.221 UK SES 17.44 85 .07 37.20 3339 26 .80 0.00427 713 China SES 17.5 87 .30 28. 00 3200 50.0...

Ngày tải lên: 11/08/2014, 18:20