Calculating fleet angle
Proper fleet angle is between 1/2° and 1-1/2°, measured as shown below. Locate the winch so this fleet angle is possible and the wire rope spools uniformly onto the drum. This prevents excessive wire rope wear and damage, and keeps the operator safe.
The fleet angle chart in the PDF guide plots minimum distance against drum width for a smooth drum (1.5°) and a grooved drum (3.0°).
Rule of thumb
Absolute minimum distance
Minimum distance to a fixed sheave (ft) = Drum length (in.)
Worked example
A drum 12 in. wide.
Minimum distance (ft) = 12
A fixed sheave must be at least 12 ft from the drum.
Can’t get the distance? Reposition the unit, use a narrower drum, or add an AutoAdvance Line Spooler. See also Lead Sheaves.