VFI, Heeling error VFIVertical Force instrument.Graduated compass needle attached with sliding weight.Rides on a sharp pivot point.Housed in a brass case.Graduated compass needle can align itself with Earth’s magnetic field.Sliding weight can move in or move out from center.By measuring the sliding weight distance, vertical force is found. Heeling error Cause:Ship’s permanent component (R).Induced by … Read moreVFI, Heeling error
Sequence of placing correctors, precautions during swinging Bi – D – E – HE – Bp – Cp(1)If -Bi, place flinder bar forward.If +Bi, place flinder bar aft.If superstructure abaft the compass, flinders bar on forward part. If superstructure forward of the compass, flinders bar on after part.(2)If +D, place quadrantal spheres athwartship.If -D, place … Read moreSequence of placing correctors, precautions during swinging
Compass correctors, cause and compensation. Coefficient details Coefficient A:Cause:Induced by H Unsymmetrical, if vessel swing too quickly.Compensation:Can’t be corrected. Coefficient B:B = Bp + BiCause:Ship’s permanent component (P).Induced by Z into VSI, F&A.Compensation:If +Bp, place parmanent red pole forward.If -Bp, place parmanent red pole aft.If -Bi, place flinder bar forward.If +Bi, place flinder bar aft.If … Read moreCompass correctors, cause and compensation. Coefficient details
Flinders bar Cylinder like arrangement on fwd or aft side of the binnacle.Contain soft iron.Length: 60 cm (600 mm)Diameter: 7.5 cm to 10 cm (75 mm)Made of: brassIf superstructure abaft the compass, flinders bar on forward part. If superstructure forward of the compass, flinders bar on after part.
Magnetic degaussing Decreasing or eliminating a permanent magnetic field.It is not possible to reduce a parmanent magnetic field completely to zero.Technically create an opposite magnetic field known as Bias. PurposesEstablish a neutral condition of parmanent magnetic field near the ship.Reduce the possibility of detonation of dynamite or mine. Application on ShipElectromagnetic coil.Electrical cable is coiled … Read moreMagnetic degaussing