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.
Specifications for KF1 furler - 2:1 removable block
|Recommended line - Max Ø (mm)||7|
|Inside Ø (mm)||8|
|Sheave Ø (mm)||33.8|
|Pin Ø (mm)||6|