Here are the settings that we are using on a couple of Alter Cup Blades with the Glaser sails.
Ed's Mast
Spreader Rake - 2 & 5/8"
Spreader bar length from bolt nearest the mast to diamond wire - 17"
Wire to wire at spreaders - 33.5"
Prebend - 1 & 1/8"
John's Mast
Spreader Rake - 4.75"
Spreader bar length from bolt nearest nast to diamond wire - 17.5"
Wire to wire at spreaders - 32"
Prebend - 1.5"
We just started racing so we'll see how it goes. Ed
Yep, I'm re-opening the topic...
I have measured a lot of the diamond wires, but I still have difficulties to compare to the measurements above for example.
Question 1: how to measure spreader rake? And doesn't rake change when adjusting the length of the arms?
Question 2: what is meant with prebend here? Distance from sailtrack to wire width or distance between sailtrack and chord from tip to foot of the mast?
These are the measurements I did:
- Diamondwire tension: 25 (gage in attachement).
- Distance from sailtrack to wire width: 800 mm
- Length of spreader from diamond wire to bolt at the mast: 48mm
- Spreader width (wire to wire): 945mm
- Mast prebend (distance between sailtrack and chord): 12mm
What is useful info, what isn't and what do I still need?
Would be great to finally have a good comparison to start from.
Gill
