The Karver block can be used for 2:1 or 3:1 purchase system on the base of the drum or it is equally effective for a 2:1 purchase on the halyard. The 3:1 end can be lashed through the centre of the sheave with the roller bearing sheave providing low friction, high load, fine tune control of luff tension. The stated pin-pin dimension is from pin centre of the attachment to the drum/swivel to the outside edge of the sheave i.e. end of the fitting. The KF12 block is also for use with the KF10 furler.
Specifications for KF12 furler - 2:1 fixed block
|Recommended line - Max Ø (mm)||14|