Theory Design Air Cushion Craft 2009 Part 4 doc

... 119 X9.8N 16000 140 00 12000 10000 8000 6000 40 00 20 40 60 80 100 120 140 v(km/h) 2000 20 40 60 80 v(kn) Fig. 3.33 The drag and thrust curves of SR.N4. etc.) is included in the air profile ... 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...

Ngày tải lên: 11/08/2014, 18:20

... 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 50 2.3 Practical ... 46 5 14. 4 Calculation methods for strength in the former Soviet Union 46 7 14. 5 Safety factors 47 3 14. 6 Considerations for thickness of plates...

Ngày tải lên: 11/08/2014, 18:20

... /// ////// Fig. 2. 24 Heave motion of a hovercraft model on rigid surfaces. SO Air cushion theory where K 3 = vl(2 P M°- 5 = Q 0 /h 0 (2 .45 ) Assume the cushion pressure is ... 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 (0.10177 - 0.1 045 ) (N...

Ngày tải lên: 11/08/2014, 18:20

... stability of SES on cushion 151 0. 04 - 0.03 - 0.02 - 0.01 - 246 Fig. 4. 17 Static transverse stability for three craft of series 717. 8 0(°) Table 4. 4 The leading particulars for ... 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...

Ngày tải lên: 11/08/2014, 18:20

... of the craft lA/'• — M 4~ M 4~ M 4& quot; M b 4- M 4~ M 4& quot; M where M w is the moment of water drag R w about the CG of the craft, M a the moment of air drag ... 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 a...

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... flexible rope the force can be written as F 4c = F 4 (d- J h /2) d F 4D =(F 4 d h )/2d (7. 24) where d h = d — R w 9 — 1 2 , F 4c is the tension of the skirt fabric at point ... track of an amphibious hovercraft model landing craft LCAC weigh- ing 150 t, at an initial craft speed of 45 knots. Owing to its rotatable ducted air propellers, the A...

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...

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... Stern cushion cushion From take-off course to post-hump 1500 1500 140 0 140 0 Cushion pressure steady, speed of 40 kph trim approx. +5° Running through a ship's stern wave 140 0 2000 ... the craft of 5 t (7 C = 10), i.e. the effect of compressibility of cushion air can be neglected, but K p = 41 % for the craft of 40 0 t, which means that in t...

Ngày tải lên: 11/08/2014, 18:20

... reasonable: < 0.2 0.35-0 .4 (10 .4) (10.5) HJB C 0.2 0.1 - N4 N6 BH7 0 oHDL JEFF (B) JEEF (A) h G Height of C.G. H s Cushion depth B c Cushion beam 0.1 0.2 0.3 0 .4 h G /B Fig. 10 .4 Vertical CG ... of cushion air compression is too small to change the air flow rate and fluctuate the cushion pressure. This is not true for full-scale craft, especia...

Ngày tải lên: 11/08/2014, 18:20

... efficiency. 0.007 0.006 0.005 0.0 04 0.003 0.002 0.001 0 0.2 0 .4 0.6 0.8 1.0 1.2 1 .4 1.6 U p c l c ( lb/ft 3 ) Fig. 12.3 Relative air clearance vs pj(. Lift fan selection and design 42 1 H/H Des N s <3 Design ... statistically as in equation (12.2) [4, 93]: HJl c = 0.05/H^ 5 (12.2a) Table 12.2 Flow coefficient for various Hovercraft Craft Country Type Cu...

Ngày tải lên: 11/08/2014, 18:20