. Deep-sea moorings; design and use with unmanned instrument stations. Deep-sea moorings; Oceanographic buoys. Isaacs-Faughv^Schick-Sargent: Beep-Sea Moorings 311 For a 300-foot pennant with scope and ten equally spaced floats having a buoyancy of pounds each, if the angle at the submerged buoy is 60 degrees, the total force in a horizontal direction is S Ph = 2 cos (^n,-i - 1/2^^) sin {6^.r - Vz^O) (23) = X = 138 pounds. Fig. 14. Restoring forces on a pennant. The initial horizontal restoring velocity at the skiff may then be calculated, using the following assumed form
. Deep-sea moorings; design and use with unmanned instrument stations. Deep-sea moorings; Oceanographic buoys. Isaacs-Faughv^Schick-Sargent: Beep-Sea Moorings 311 For a 300-foot pennant with scope and ten equally spaced floats having a buoyancy of pounds each, if the angle at the submerged buoy is 60 degrees, the total force in a horizontal direction is S Ph = 2 cos (^n,-i - 1/2^^) sin {6^.r - Vz^O) (23) = X = 138 pounds. Fig. 14. Restoring forces on a pennant. The initial horizontal restoring velocity at the skiff may then be calculated, using the following assumed form drag areas. A half-inch pennant reaching to 150 feet (i/^ x %2 x 150)... sq. ft. Ten floats A vertical instrument line with instruments Equivalent form drag area of skiff (20 x ) sq. ft. Vo = V (2x138)7() = 3 ft. per second which exceeds the requirement of feet per second set by a hypothetical storm wave 25 feet high. This result is not very sensitive to changes in the figure of the pennant except under two conditions. The first is the improbable condition that combers might occur when there is little wind or surface current. The second is that the pennant is stretched so that 6^ at every float is less than 30°. In this instance, however, the elastic stretching of the pennant rapidly increases the restoring force, as already noted. When the skiff is being driven by the cascading comber, its bow is deep in the water and Cd == 1-0. "When it surmounts or reaches the terminus of the comber, it floats higher, especially at the bow, and Cd = There is thus a large effective force available to stretch the pennant, of which a small proportion is sufficient, when added to the buoyancy of the floats, to make up the required restoring 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
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