Upper arm is secured to shell plating or to a plate inside vessel, lower arm is secured to keel or to a steel casing on keel.
Ingalo engentla igcinelwa ukukhusela ulwaleko okanye kulwaleko ngaphakathi kwengqayi, ingalo esezantsi igcinelwa ukuthambekisa inqanawa xa uyilungisa okanye intsimbi esisigqubuthelo kwisiseko senqanawa