Theory Design Air Cushion Craft 2009 Part 6 ppt

... = 0 (6. 7) = [l = (i = 0 (6. 8) The expressions in equations (6. 6) and (6. 7) are the position derivatives, which can be obtained by wind tunnel experiments. Equation (6. 8) gives ... 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 centre...

Ngày tải lên: 11/08/2014, 18:20

... the craft in yaw into account, the added drag will increase further). 66 Air cushion theory 2.4 Static air cushion characteristics on a water surface Static hovering performance ... 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; there...

Ngày tải lên: 11/08/2014, 18:20

... damage to the craft and personnel. fll .6 Fig. 12.12(a) 0 5101520 30 40 50 60 70 80 90 100 X y 0 16 5 4 .6 0 1E 6. 3 ' 20 7.25 30 7 .6 40 24 50 6. 85 60 6. 08 70 5.1 80 3.95 90 2 .65 100 1.2 412 ... weight Key W\ Wl m W4 W5 W W6J m w% AUW 7313 Design weights (kg) SES September 1 969 Wu Dong shipyard 77 96 260 5 8540 735 Included in 'Hull' 1 967 6 64...

Ngày tải lên: 11/08/2014, 18:20

... 40 261 5 67 20 972 63 0 50 3000 7470 1100 67 0 50 3 360 8 360 1230 750 60 3750 9390 1370 840 65 Overhang length from transom. F 75 80 100 110 120 130 140 165 180 200 220 G 415 410 63 5 63 5 67 5 745 810 1030 1020 1140 1270 H 480 64 0 69 5 760 860 965 1085 1185 1 360 1520 1700 J 790 840 945 1030 1120 1280 1450 161 0 1820 2030 2230 K 900 1220 1350 1510 1700...

Ngày tải lên: 11/08/2014, 18:20

... layout 16. 7 Systems and controls 16. 8 Operation and maintenance References Index 487 487 507 515 520 5 36 564 574 577 577 585 588 5 96 604 60 6 60 7 60 7 61 2 61 8 ... propulsion 16. Power unit selection 16. 1 Introduction 16. 2 Powering estimation 16. 3 Diesel engines 16. 4 Gas turbines 16. 5 General design requirements 16. 6 Machinery space layout 16. 7...

Ngày tải lên: 11/08/2014, 18:20

... weight Cushion pressure m / m B c m h s m h k m B^ m fi. deg a deg ft N W N/m : p c 1 .61 0.35 0.0 56 0.042 0.05 0.015 65 89 1 56 290 approx. 2 0.492 0. 167 0. 067 0. 067 0.025 75 90 4 06 370 ... years Time interval Craft model Skirt drag coefficient June 1 968 -June 1 969 Sept. 1 967 -March 1 969 March 1 969 -June 1970 July 1970-June 1971 June 1973-Feb 1...

Ngày tải lên: 11/08/2014, 18:20

... T bt Units km/h N/m 2 m /s m m m m 26. 5 2813 5.115 0.5254 0.2 066 0.0 86 0.0 86 33.1 44.2 2789 27 76 5.115 5. 165 0.5823 0.5952 0.2008 0.19 86 0.0858 0.0 868 0.0 866 0.0 868 55.2 2787 5.15 0.5599 0.20 06 0.089 0.089 174 ... T bl Units km/h N/m 2 mVs m m m m 30 .67 269 0 23 .65 0.402 0.0389 0.1535 0.1535 42.90 27 16 23.55 0.3 86 0.0399 0.1385 0.1385 51.08 2 763 23.38 0.3...

Ngày tải lên: 11/08/2014, 18:20

... skirt, finger depth d and the size of air duct are given, then L, 6, 6& apos; and the other skirt parameters, which satisfy the design bag -cushion pressure ratio, can be obtained, ... 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. C...

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

... 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 via air ducts, ... stern wave 1400 2000 160 0 1800 Trim approx.+4.5° Another take-off course 1400 1500 160 0 160 0 Trim approx. +6. 5° During operation of the craft, some 0-1500 0-2500 1300 1...

Ngày tải lên: 11/08/2014, 18:20