re: Sheaves - from a queston on the boatdesign listserv
I made the bow anchor roller on the bowsprit of the SweetCaroline, from
laminated yellow pine 2x6. I bushed the 5/8 inch holes with 1/2 inch hard
copper water pipe (also great for drilled oarlocks), glued in with PLPremium
or epoxy. Used a 1/2 inch galvanized bolt for an axle and a hard rubber
trailer bow roller as the sheave. Total cost about $6 US, vs. $80 or so for
a stainless steel welded bow anchor roller at West.
You should be able to fiddle out something at smaller scale for a halyard
sheave. If the sail is not too big, you can use two PVC 90 degree L's
mounted fore and aft at the top of the mast. They are smooth enough to
reduce friction some, but not as free as roller sheaves of course.
Don Hodges
laminated yellow pine 2x6. I bushed the 5/8 inch holes with 1/2 inch hard
copper water pipe (also great for drilled oarlocks), glued in with PLPremium
or epoxy. Used a 1/2 inch galvanized bolt for an axle and a hard rubber
trailer bow roller as the sheave. Total cost about $6 US, vs. $80 or so for
a stainless steel welded bow anchor roller at West.
You should be able to fiddle out something at smaller scale for a halyard
sheave. If the sail is not too big, you can use two PVC 90 degree L's
mounted fore and aft at the top of the mast. They are smooth enough to
reduce friction some, but not as free as roller sheaves of course.
Don Hodges