| Improvement to shroud chain plate design for Masthead rig |
|
Information supplied by Gordon Marshall of Going Koncern
The cause of the problem is the securing weld (or crimp) on the top deck plate. It's inducing a fatigue week spot, resulting in cracking, and resulting rig failure. It's impossible to see these hairline cracks, until it is too late.
Figure 1 - Existing Mast Head “U” Bolt arrangement
Fractional rig GK24 yachts utilise a different arrangement. They have an angle bar bolted to the deck, tapered up to the shroud attachment points, as shown below. Figure 2 - Fractional Rig Arrangement The Modified arrangement is similar to the Fractional rig detail apart from the spacing of the attachment points. This is due to the shroud position and mast rake. Under deck securing is not affected. The forward bolts remain attached to the main transverse bulkhead brackets, and the aft bolts to the existing tension bar. This is attached onto the longitudinal frame bracket. Figure 3 - New Mast Head chainplate arrangement
|
|
| Last Updated ( Friday, 07 September 2007 ) |
| < Prev | Next > |
|---|
