Енциклопедія яхт
Cutless bearing
Cutless bearings on shaft-drive yachts: wear signs, survey checks, and FairHelm limits on guessing remaining life afloat.
Що це
A cutless (cutlass) bearing is a water-lubricated rubber bearing that supports the propeller shaft in a strut or stern tube.
Anchor
Shaft-drive Nordic boats often pair cutless bearings with stuffing boxes. Saildrives use different bearing architecture. FairHelm listens for shaft rumble under power and checks play when hauled.
FairHelm judgment
FairHelm judgment: excess shaft play at the bearing and scored shafts are haul-out items. Do not accept "runs fine" without hardstand feel if vibration shows in trial.
Limits
Clearance limits vary by shaft diameter and maker. We do not invent millimetre tables here. Use surveyor gauges for that shaft.
Часті запитання
Q: Can I replace a cutless bearing afloat?
A: Usually no. Expect haul-out or lift for proper work.
Q: Is vibration always the cutless?
A: No. Prop damage, alignment, and engine mounts also vibrate.
Q: Do saildrives use cutless bearings the same way?
A: Architecture differs. Do not copy shaft advice blindly to saildrives.