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windlass & autopilot
"Vertical vs Horizontal:
. . . Often a boat with one bow roller on the center line will select a vertical windlass. A boat with two bow rollers might use a horizontal windlass."
The following two facts within the same article seem to contradict the above comment:
. . . They allow the anchor rode to come aboard at almost any angle . . .
. . . The disadvantages are that the anchor rode must travel in a direct line from the bow roller to the windlass (often necessitating the windlass to be mounted off center) which sometimes looks odd . . ."
Rode can feed in at any horizontal angle, but must be near horizontal in elevation. With a single bow roller, the vertical windlass can be placed on the centreline, without regard to any offset in the bow roller (either side of forestay). Can also be used with multiple roller setups.
Rode must feed in at 90 degrees to capstan drum (in horizontal bearing aspect), but can be at almost any angle in elevation. A single (offset) bow roller would require an off centre mounting of the horizontal windlass, so that the rode feeds (more or less) directly to the capstan. With twin rollers, the (2) capstans are more or less lined up with the two offset rollers.