. Deep ocean cable burial concept development. Cables, Submarine; Marine engineering; Civil engineering. requirement of less than 10,000 pounds. There are two major problems identified for this type of propulsion system. While the traction unit is pulling itself along the cable, it is also ''pushing" it astern. Any slack in the cable will be taken up by the traction unit and will result in buckled cable astern, which will tend not to stay in the trench and may damage the cable. The other problem is one of size. In order to avoid overstressing the cable locally, the traction unit must be a
. Deep ocean cable burial concept development. Cables, Submarine; Marine engineering; Civil engineering. requirement of less than 10,000 pounds. There are two major problems identified for this type of propulsion system. While the traction unit is pulling itself along the cable, it is also ''pushing" it astern. Any slack in the cable will be taken up by the traction unit and will result in buckled cable astern, which will tend not to stay in the trench and may damage the cable. The other problem is one of size. In order to avoid overstressing the cable locally, the traction unit must be approx- imately 35 feet long for SD cable. This requirement will result in a large, unwieldy burial machine. Finally, the traction unit is a relatively complex piece of equipment which may prove unreliable on the ocean bottom where the sediment content of the water may be very high due to the ma- chine's presence. Table 5. Thrust for Ducted Propellers at Zero Advance Speed* Assumptions Torque Q = 2,000 ft-lb = constant shp < 100 hp v = 0 d = 4 ft Blade thickness fraction = Mean width ratio = Rake angle = 15° Number of blades = 4 Total blade area ttd2/4 Nozzle A Nozzle B n (rps) shp (hp) p/d T (lb) l/d = s/l = a = ° £/d = s/X, = a = ° Case 1 Case 2 Case 1 Case 2 4 4,915 4,453 4 5,325 4,704 * See Table 6 for definition of terms. 26. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rockwell, P. K; Naval Construction Battalion Center (Port Hueneme, Calif. ). Civil Engineering Laboratory. Port Hueneme, Calif. : Naval Construction Batallion Center
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