Heavy SS Masthead Spinnaker
Cranes are specially designed to attach easily to standard Isomat Cast Mastheads. Cranes
allow for off-center attachment of one or two standard swivel blocks for
external spinnaker halyards, See Spinnaker Halyard Blocks. This
method of running spinnaker halyards has less friction and eliminates the chafe on
halyards that is inherent in the standard internal halyard design – it is the only
choice for long-distance racing or cruising. Halyards can be led internally; running from
the swivel block to an entrance 5-8 feet down from the masthead, but this method does add
a potential chafe spot. These cranes are not for use with Fractional Mastheads.
NG-1 Masthead Spinnaker Crane: NG1-2:
Spinnaker Crane for use only with NG-1 Masthead. Isomat NG-1 Mastheads are easily
identified by having only 2 sheaves (or provision for only 2 sheaves) side by side, on the forward side.
Stainless Steel Plate is (maximum) 3 7/8" long x 4 3/8" wide x 3/16" thick, and projects 2"
forward of the masthead. Easily positioned on the masthead, unit attaches with (2) 1/4" bolts and locknuts,
and (2) 4mm (5/32") screws that go into the threaded holes for the masthead Cover
Plate screws. Mounting requires drilling (2) 1/4" holes in the masthead. Unit comes complete with fasteners. |
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NG-2 Masthead Spinnaker Crane: NG2-2:
Spinnaker Crane for use only with NG-2 Masthead. Isomat NG-2 Mastheads are easily
identified by having 4 sheaves (or provision for 4 sheaves) side by side, on the forward
side. Stainless Steel Plate is (maximum) 4" long x 5 3/8" wide x
1/4" thick, and projects 1 3/8" forward of the masthead. Easily positioned on
the masthead, unit attaches with (4) 5/16" (8mm) bolts and locknuts, mounting
requires drilling (4) 5/16" holes in the masthead. Unit comes complete with fasteners. |
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