FIGURE 2-16. Christmas Tree Rig.
b. Honolulu Rig. The Honolulu rig was developed for inter-island towing, where individual units of multiple tows were
delivered to or picked up from different ports. The first tow streamed is connected to the main tow wire and
streamed farthest aft. Additional tows are connected with auxiliary tow wires to quarter bitts or auxiliary drums. The
Honolulu rig allows independent connection of the two tows, disconnecting and control are readily workable, and it is
relatively uncomplicated to get both tows in step with the tug Figure 2-17 depicts the Honolulu rig.
c. Tandem Rig. The Tandem rig, shown in Figure 2-18, connects the tug to the first tow. The first tow is connected to
the second, and so on, as additional tows are added. The intermediate towline, connecting the first tow to the
second, must allow a proper catenary depth so that surging action is minimized between tug and first tow and
between first and second tow In this type of rig, it is difficult to keep all elements in step. This is the least desirable of
the single tug/multiple tow arrangements as it lacks the flexibility and control of the Christmas Tree or Honolulu rigs
for break-up upon entering port.
d. Nested Rig. A Nested rig tow employs multiple tows secured alongside each other so that they may be towed as a
single unit This rig is to be used only in protected waters. See Figure 2-19.
2-5.3 MULTIPLE TUGS, SINGLE TOW. It may be desirable to use more than one tug for a single tow. Greater power,
increased towing speed and better control may be obtained in a multiple tug tow. This method is generally used to tow
large ships, deepdraft large-displacement dry-docks, deep-draft barges or battle casualties.