Tuesday, March 9, 2010
Vega Standing Rigging Overhaul.
My rigging wire appears to be the original sized 5mm diameter 1x19 stainless steel wire. The nearest size to this is Imperial measure 3/16", which is slightly smaller, hence weaker. Given the fact the wire is completely enclosed by the furler foil, and subject to more strain with the weight and windage of the furler, I chose to upsize to 7/32" wire.
I read somewhere that this causes "point loading" because the pin is smaller than the hole, and can reduce strength by as much as 15%.
Now I realize the boat is almost 40, and the rigging has held up well, but when replacing things it gives me a warm fuzzy feeling to do it right. I know it's definitely a "no-no" to simply drill out the tangs and turnbuckle jaws from 5/16" to 3/8", as this would weaken them further.
So I've compromised by installing bushings through all the 3/8" eyes to reduce the hole size to 5/16", so the pins are now a good fit. This was easy to do as I found some SS tubing of the right size, and just had to cut it to length on the lathe.
When the rest of the wire gets replaced I'll install new turnbuckles and tangs with 3/8" pins.
Meanwhile, let's hope those crown rings arrive soon ....