Spinlugger rig?

Discussions of proa and tacking outrigger design & technology not tied to a particular design. Anything from the accomodations to different steering solutions and wingsails.
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tdem
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Re: Spinlugger rig?

Post by tdem » 08 Jul 2016, 09:03

It's pretty much a sprit sail jib!
The most important thing is to keep the most important thing the most important thing.- Donald Coduto
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Manik
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Re: Spinlugger rig?

Post by Manik » 18 Jul 2016, 17:12

red cedar wrote:Thanks Manik for the Wharram link concerning the Oru rig.
Wharrams illustrations worked better than the Youtube video to help show me how the Oru rig shunts.
But what prevents the sprit and mast from collapsing to windward when taken aback?
That's a good question... Perhaps nothing? Traditional crab claws would also just fall over if taken aback, that way at least the boat doesn't capsize. Or maybe you could work out lee shrouds somehow?
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luckystrike118
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Balanced Lugsail, wrong side of mast?

Post by luckystrike118 » 20 Jul 2016, 00:52

I have some experiences with the balanced lugsail. In fact there is no big difference in performance if the sail is on the "wrong" side of the mast.

In close areas where you have to shunt often, you do it like tacking normal (wrong side, right, wrong and so on) and if you are on a long leg you change it so that the yards are leeward, no big deal. If you can brail the sail to set the yards vertical, its even easier.

Michel
Tinkproa
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Re: Spinlugger rig?

Post by Tinkproa » 06 Nov 2016, 09:44

Hello
I accidentally came across this thread and thought I would joint to comment on it. The sketch in the first post is mine from a few years back. I had no intention of it being used for a cruiser, the exact opposite in fact. It was proposed as for a minimal proa a bit like a beach cat. The idea was that you could move the centre of effort of the sail and so steer without a rudder etc. I saw it more like a tethered kite than a conventional rig. As you have pointed out the issue is getting enough tension in the luff. On the original forum the idea of an inflated tube UUP the luff was discussed.

There is a video of a model I made at https://youtu.be/JyE0FsI_GAQ

Cheers

Tink

https://tinkboats.wordpress.com
http://proasail.blogspot.co.uk
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RiskEverything
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Re: Spinlugger rig?

Post by RiskEverything » 29 Nov 2016, 03:46

red cedar wrote:But what prevents the sprit and mast from collapsing to windward when taken aback?
Nothing, just like the crab claw.
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Amati
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Re: Spinlugger rig?

Post by Amati » 25 Dec 2016, 19:14

I actually did a dipping lug but on an ama less-IC -

You can use the dipping lug as an air rudder

the lug would be do-able to dip/shunt IF the platform is stable at rest.

Powerful sail, close winded.

An unstayed rig will work- needs to be very stiff- the windward mast does little 2 the l/d, so keep it simple - dipping the rig is straightforward, so you only need an unstayed mast

My top spar was very light- 1lb 5oz- but it was up 20', so I noticed it.

I'll try and find a pic- it can be very simple

:)
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Amati
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Re: Spinlugger rig?

Post by Amati » 25 Dec 2016, 20:25

Dipping lug
IMG_1087.JPG
IMG_1087.JPG (30.19 KiB) Viewed 963 times
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Amati
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Re: Spinlugger rig?

Post by Amati » 25 Dec 2016, 20:44

Tinkproa wrote:Hello
I accidentally came across this thread and thought I would joint to comment on it. The sketch in the first post is mine from a few years back. I had no intention of it being used for a cruiser, the exact opposite in fact. It was proposed as for a minimal proa a bit like a beach cat. The idea was that you could move the centre of effort of the sail and so steer without a rudder etc. I saw it more like a tethered kite than a conventional rig. As you have pointed out the issue is getting enough tension in the luff. On the original forum the idea of an inflated tube UUP the luff was discussed.

There is a video of a model I made at https://youtu.be/JyE0FsI_GAQ

Cheers

Tink

https://tinkboats.wordpress.com
http://proasail.blogspot.co.uk
I'm not convinced that luff tension needs to be bar tight- if you look at my pic above, you'll see that the luff sags to leeward, but if the cut of the sail is optimized to that, it?s close to kite sail shape, and kite sails can be/have to be close winded because of the apparent wind shifts. At least that was my thinking with this sail, but I didn't have enough stability/skill :lol: to keep her upright in anything above 5 K. Should have added an ama.....

It was close winded, and I was using one of Tom Speers bi directional 12% foils that Phil's Foils made for me.

Air rudder was an endless line tied to the end of the fore and aft rotating seat running via tackle to the tack 'o the main- seat went back, tack went forward and vice versa. Worked ok. Initially I had seat movement raking the foil fore and aft via tackle, but that was too much friction, since it had to go the opposite direction on the tack. Dipping while shunting was, um difficult as far as balance, as I mentioned above.

Merry Xmas!
Tinkproa
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Re: Spinlugger rig?

Post by Tinkproa » 22 Jan 2017, 09:06

Still keep coming back to this, if the mast was stiff enough and you could hold the luff tension it has a lot of mileage

This is a tiny 3m test proa
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RobinBennett
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Re: Spinlugger rig?

Post by RobinBennett » 22 Jan 2017, 09:37

Do you have plans for reefing that rig?

I think you'd have to make the mast S shaped, so there was a vertical section at the top for the yard to slide down.
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