Graeme wrote:

Jan, If it is just to hold the yard close to the mast, you can just use a soft standing parrel there. (No need for a running YHP). That is what I have found on my Amiina NM2 rig. Or, as you suggest, one of your "rigid parrels".

Although the yard is standing away from the mast (in your photo) the sail looks to be setting nicely without a yard hauling parrel, so the YHP is not needed to make the sail set properly. I find the same with my Amiina sail. But I did decide later to put a standing parrel there, just for safety sake and to keep everything tighter.

It has been suggested (By David if I recall) that a much larger version of the Amiina sail might need a YHP. I can't see why a simple standing parrel would not be enough, as it is with the small size sail - but I defer to David's experience and see no harm in it anyway, just another rope to adjust whenever you reef or unreef, that's all.

For the record, Arne has expressed doubts about rigid fittings of this type, and although he designed a very nice rigid parrel concept, he has told me that he has doubts about it. It needs to be recorded that the rigid type has been proved successful on your boat and on the Serenity of Steve D, but as these are relatively small rigs, we should not assume that the idea is appropriate for a larger ocean-going sail, until the concept has been tried and proven. (Thomas might try the idea? If so, he would be pioneering).

Though perhaps (especially for large offshore sails) there’s a case to be made for a standing yard parrel based on PJR fig 3.34 - a short length of batten tube plus fendering material, that will permit sufficient fore and aft movement of the yard relative to the mast, while limiting athwartships movement more than a soft standing parrel does. 

Jan, If it is just to hold the yard close to the mast, you can just use a soft standing parrel there. (No need for a running YHP). That is what I have found on my Amiina NM2 rig. Or, as you suggest, one of your "rigid parrels".

Although the yard is standing away from the mast (in your photo) the sail looks to be setting nicely without a yard hauling parrel, so the YHP is not needed to make the sail set properly. I find the same with my Amiina sail. But I did decide later to put a standing parrel there, just for safety sake and to keep everything tighter.

It has been suggested (By David if I recall) that a much larger version of the Amiina sail might need a YHP. I can't see why a simple standing parrel would not be enough, as it is with the small size sail - but I defer to David's experience and see no harm in it anyway, just another rope to adjust whenever you reef or unreef, that's all.

For the record, Arne has expressed doubts about rigid fittings of this type, and although he designed a very nice rigid parrel concept, he has told me that he has doubts about it. It needs to be recorded that the rigid type has been proved successful on your boat and on the Serenity of Steve D, but as these are relatively small rigs, we should not assume that the idea is appropriate for a larger ocean-going sail, until the concept has been tried and proven. (Thomas might try the idea? If so, he would be pioneering).

Hi Jan,

you might want to try something like this, a "yard parrel":

https://www.junkrigassociation.org/technical_forum/13405202?tpg=8&mlpg=2#13406842

Cheers

Paul

Well done Jan, nice photos!, you're on the water!! 

Polytarp is great, I miss it.... Your sail looks good on your boat, I wish you many happy hours on the water man!

Keep Junking!

Hi!
On Monday I sailed for the first time with the new sail, this time sewn according to the Slieve's method. I can see a big difference - the dead zone decreased from 135deg (old sail) to less than 110deg (new sail). This is probably also thanks to the fifth panel (toppanel), slightly larger surface area of each panel compared to the previous sail (Origami SJR), and greater cambers in the new panels. And certainly thanks to the greater tightness of the sail.

The photo (from livecam) isn't very clear, but everyone says the sail with the toppanel looks more professional.

I'll try to measure the dead zone without one panel, which will help determine how much the four panels of the new sail (SJR) differ from the four panels of the old sail (Origami without toppanel). Unfortunately, I don't know when the weather will allow for this - rain is forecast for now.

As we know - greater camber means more thrust but also more heel, so I had to sit on the side as "ballast". Trade-offs.

For land testing I used a stand with stays. The mast with sail weigh 8 kg together, so it's no problem to put the mast with sail into the stand.
I wonder if such a stand couldn't be used as a device for measuring different sail configurations. It could be equipped with devices for measuring tensions in the stays and a simple recorder (like Arduino).
But that's a project for long winter evenings, not now!

Sewing the new sail took much more time than quickly gluing simple Origami panels for the old sail. I'm afraid this time the bluetarp (which I used again) won't last two seasons. Bluetarp doesn't like needle punctures. Nor unpicking!
It'll be good if the new sail lasts one season. So, if  serious damage happens - I'll go back to using the old sail.