Theory Design Air Cushion Craft 2009 Part 9 potx

... 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

... of craft Craft HM.2Mk2 HM.2Mk3 717A 717C 7 19 7 19- 11 Measurement position Middle of passenger cabin Front of passenger cabin Rear of passenger cabin Bridge/wheelhouse 94 96 93 92 83.5 83 86.5 80.5 93 94 75 83 80 89 85 80 73 65 Scaling ... height 198 0 4 .94 0.17 0.077 Computer. Close to experimental results 196 6 3.5 0.08 0.062 Computer analysis 198 2 5.05 0.306...

Ngày tải lên: 11/08/2014, 18:20

... knots 0.663 0 .97 0 .98 5 0.633 Water jet typical 1 inlet 7/je, '/pump '/nozzle '/t IH for w = 0.05, t = 0 '/ope 30-50 knots 0.80-0 .95 0.70-0.85 0.85-0 .95 0 .99 0 .97 1.052 0. 495 -0. 795 Example ... rjj) = 19 000/0.65 = 29 230 kg required Power required is then N= T p F c /(1000 /9. 81 ?; t ) kW = 29 230 X 25.7/(1000 /9. 81 X 0 .97 ) = 77...

Ngày tải lên: 11/08/2014, 18:20

... developments in the 199 0s 39 1.7 Applications for ACV/SES 41 1.8 The future 45 1 .9 SES and ACV design 46 2. Air cushion theory 48 2.1 Introduction 48 2.2 Early air cushion theory developments ... time Date of Construction 196 0 196 5 197 0 197 5 198 0 198 3 Craft SR.N1 SR.N5 BH.7 SR.N4 SR.N4 Mk3 API. 88 Engine Aircraft, piston Gas turbine Gas tu...

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 ... // V A /J J Air cushion wave-making drag 95 10 20 30 40 50 60 70 80 90 Fig. 3.12(b) Wave-making drag coefficient for yawed craft, F r = 1.0. 10 20 30 40 50 6...

Ngày tải lên: 11/08/2014, 18:20

... years Time interval Craft model Skirt drag coefficient June 196 8-June 196 9 Sept. 196 7-March 196 9 March 196 9-June 197 0 July 197 0-June 197 1 June 197 3-Feb 197 5 197 3- 197 6 N102 N300-02A N102C N102L N300-02B N500 ... post-hump speeds, because a large air flow rate will increase the air component of the two-phase flow blown from the air cushion, produ...

Ngày tải lên: 11/08/2014, 18:20

... 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 4.34 17.31 2630 0.00658 1.27 0.15 60 89 0.12 18.20 17.3 3.5 4 .94 15.38 2660 0.00570 1.27 0.15 60 89 0.12 correct, therefore, ... /s m m m m 26.5 2813 5.115 0.5254 0.2066 0.086 0.086 33.1 44.2 27 89 2776 5.115 5.165 0.5823 0....

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

... 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 ... ACB can be written as follows: a 2 = b 2 + ( 2 R sin 9/ 2) 2 - 26 (2 R sin 9/ 2) cos (n!2 - 9/ 2 + 0) (7.12) a 2 = (2 R sin 9/ 2) 2 - b 2 + 2ab cos ft (7.13) R = LIO...

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