7.5 knots with wrinkels
Today the wind was gusty 5-10 m/s (10-20 knots). We were reaching at 7.5 knots. Nice. Found some bugs in the sail though.
- Wrinkles, we need tighter lashing at the ends of the bamboo battens, so the sail is streched. (And it still hurts when I tie my shoes after lashing the battens the first time…)
- We really need a downhaul (as in the plans).
- We need to move the sheeting aft and up (as in the plans).
- We need stiffer battens. We will temporary lash more bamboo to the lowest batten.
Now we had too much twist when reefed. We re-reaved the sheet afterwards. Maybe it will help some.
No need to use the tiller when on the wind. Just steer with the sheet and running luff parrel. It is possible to hoist the sail with the winch when reaching or running. No need to luff. Probably the friction is so little compared to the weight so you won’t notice…
No pictures today. The sail looked too wrinkled.
Posted: August 15th, 2007 under Sailing, Junk rig.
Comments: 4
Comments
Comment from Stuart Crawford
Time: August 16, 2007, 1:24 am
Given the theoretical hull speed should be between 6.6 and 7 knots, that’s pretty good! Maybe there is something in what Tom say’s about the transom fooling the water into thinking that the boat has a longer waterline than it does.
Stuart.
Comment from matti
Time: August 16, 2007, 4:45 pm
The prismatic coefficient is quite high, if I remember correctly. So the resistance should be optimized for a higher speed. But don’t quote me on that. I don’t know such things.
/m
Comment from Kai
Time: August 16, 2007, 9:17 pm
Was that 7.5 knots over ground or through water? (GPS or log readings?)
Comment from matti
Time: August 16, 2007, 10:00 pm
Velocity over ground. From the GPS. But where we did sail it is the same. We won’t have a knot meter on Linnea. We do have a log though and a GPS.
/m
Write a comment