Re: Chainplate bolt failure
Posted: Fri Jan 29, 2010 10:12 am
Chainplate fixing method and possible failures
The chainplates (stainless steel bent plates fixed to the deck which hold the wire rigging port and starboard sides) have been fixed to the deck in two methods.
1. The first method used a black anodised solid round alloy bar with two threaded holes in it. The chainplate on the top of the deck was then bolted through the deck and into the threaded holes.
This method of fixing was dropped, as although the bolts were coated in an electrolysis barrier paint the bolts still corroded in the alloy bar making replacement less easy.
2. The more recent boats have replaced the round alloy bar with large curved washers. This stops the corrosion problem.
Chainplate fixing bolt shearing
A small but regular failure is that the bolts can shear. One bolt fails, and the rig then looses tension.
The class technical committee and Ovington Boats discussed this problem, and Ovington Boats now supply all new bolts with a higher grade bolt.
This bolt is available directly from Ovington Boats.
The chainplates (stainless steel bent plates fixed to the deck which hold the wire rigging port and starboard sides) have been fixed to the deck in two methods.
1. The first method used a black anodised solid round alloy bar with two threaded holes in it. The chainplate on the top of the deck was then bolted through the deck and into the threaded holes.
This method of fixing was dropped, as although the bolts were coated in an electrolysis barrier paint the bolts still corroded in the alloy bar making replacement less easy.
2. The more recent boats have replaced the round alloy bar with large curved washers. This stops the corrosion problem.
Chainplate fixing bolt shearing
A small but regular failure is that the bolts can shear. One bolt fails, and the rig then looses tension.
The class technical committee and Ovington Boats discussed this problem, and Ovington Boats now supply all new bolts with a higher grade bolt.
This bolt is available directly from Ovington Boats.