Junk Rig Rocks

Hull speed +

Clean bottom, one reef, 15-18 knots wind.

https://www.dropbox.com/s/9d03zpdi027evf2/IMG_7443.MOV?dl=0

Frederik wrote:

It's the first time for me to play with a selfsteering device. I'll have to spend some more time finetuning and do adjustments.  So far it works great on all courses forward of the beam, but with the wind aft this thing seems to have a mind of its own. It’s like the pendulum is taking control instead of the vane doing its job...suggestions anyone?

I had a similar problem and what helped was downsizing the pendulum, also fine tuning the balance of the pendulum. On the photo you can see the change I made and it helped a lot. The force even in really slow movement is huge so there is no need for a big pendulum. But it's much more important to have a bigger vane, especially in very light conditions (also if the wind is from the aft).

I surely agree, Frederik.

See attached video clip.

https://www.dropbox.com/s/448arab7p6sksgb/20200529_161426.mp4?dl=0

Here I recently even fitted some 2m long ones for the top section (only for that trip). Slieve McGalliard was curious to see what happened to the airstream up there. Also note the home-made wind-indicator at the mast top.

Arne

The selfsteering is a Holland winvane, aka Bouvaan. 

I picked up a secondhand one, last time I visited the "vaderland" (the Netherlands).

They come in different stages of completion. 

It's the first time for me to play with a selfsteering device. I'll have to spend some more time finetuning and do adjustments.  So far it works great on all courses forward of the beam, but with the wind aft this thing seems to have a mind of its own. It’s like the pendulum is taking control instead of the vane doing its job...suggestions anyone?

The photos are a bit distorted. The third one shows a little device I’ve made so that I can move the steering lines up and down the helm, in order to find the best place of attachment. 

I’ve set it up with the lines attached way forward on the helm so as to avoid oversteering with the wind aft of the beam. Not that it helps a lot....

Anonymous wrote:

Good morning Frederik and Arne. Your sail looks very good. Where is the point of maximum camber on the sail chord?

Paul

Hi, Paul, on my sails i aim for about 35% from the luff. It could well be that it is more efficient with it further aft, but I found on my first junk, Malena, that the actual CP 'followed' the max camber point. The present choice of position is therefore mainly to avoid weather helm problems.

Arne

PS: Orion's sail was made by a sail maker, so I cannot tell where he put the max camber point...