Theory Design Air Cushion Craft 2009 Part 10 potx

... 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, especially for larger hovercraft ... 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 position compared to ACV cushion heights. 358 Design methodology and performance e...

Ngày tải lên: 11/08/2014, 18:20

... this case the cushion air compressibility cannot be neglected. K p (%) 40 30 20 10 // Vl -0.9m // u =3.2m 0 10 100 100 0 W(t) Fig. 8.25 Influence of cushion air compressibility on ... 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 400 t, which means that in this...

Ngày tải lên: 11/08/2014, 18:20

... a portion of the 550 Propulsion system design 50 40 20 10 Size 50 63 71 80 90 100 9 10 11 12 13 14 15 16 (HPx 10& quot; 3 ) i i i i 67 Power 10 11 12(KWxlO~ J ) 12345 Fig. 15.37 KaMeWa ... this design was selected for the 3KSES as a design basis. At craft speeds of 30 knots, F/F C variation between 0.5 and 0.95 can occur without cavitation on a typ...

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 ... all up weight of 750 to 100 0 tons. The main problem occurred Theory and Design of Air Cushion Craft Liang Yun Deputy Chief Naval Architect of the Marine De...

Ngày tải lên: 11/08/2014, 18:20

... 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 (0 .101 77 - 0 .104 5) (N s 2 /m 4 ), ... c/g=0 2: c/g=0. 3:cA?=0 .10 a: cushion length b: cushion beam c: acceleration d: water depth l/(2Fr) Fig. 3 .10 Variation of cushion wave making drag...

Ngày tải lên: 11/08/2014, 18:20

... 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 ... acting on skirt heeling craft. 124 Steady drag forces 0.04 0.03 0.02 0.01 Craft speed v,=2m/s Finger type skirt Firm snow 10 15 20 Skirt drag /Craft weight x 100 (%) 2...

Ngày tải lên: 11/08/2014, 18:20

... 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 ... plough-in. Factors affecting ACV transverse stability 171 AM/A6> .mpartment 20 60 100 Fig. 4.36 Influence of air cushion compartmentation on static stability. where A#...

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 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 ... series of craft had cushions with a series of jupes. The highly compartmented cushion provided great heave, pitch and roll stability. ACV turning performance 231 X(m) 100 2...

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