Thread: GIS Yawl

I get the same hollow sound whatever the boom is made of.

MIK

Lol, you know so much about boating,
who wood have thunk it?

Hi GIS (Glorious Iconoclastic Sailors) !
Detlef Dücker told me about your Goat Island Skiff, as we were sailing the VelaRaid 7th edition on the magnificent Venice Laguna last week.
My first contribution to this forum will then be a COMPLAIN.
Dear Mike, I can't find sleep any longer…
And can't stop looking at pictures and videos of your so beautiful skiff!
With only one idea in mind: build one in the nearest future.
I love John Goodman's videos and comments. And I love the yawl rig. So is my BayRaider's rig (design from Matt Newland, SwallowBoats, and fantastic boat too, but not the same programm!). And I wonder (excuse my deep poor amator structure) wether you made specific plans for this rig configuration or is it only John's initiative? And is there much difference according to main sail aera in this configuration? I personnaly like the versatility and the beauty of the yawl rig. But fear that it might be too much work for a lazy lonely sailor, which is my usual way to sail when friends are too busy.
Good evening to Australian friends, good morning to the American !
Jacques

Hi All

New guy here,


First off, Ive probably built about 10 GIS's in my head already, now just got to buy a set of plans and build a live one! I love the elegant simplicity of Mr Storer's design, and also the yawl adaptation thereof.


Ive been thinking of how to build the standard GIS and make it easily adaptible to the yawl version later on if desired:

• I like the idea already posted about mounting the mizzen on the stern seat with mast partner on the top of the transom. That should be easy to retrofit? May need some strengthening under the seat at the foot of the mizzen and strengthening of the transom? Any feedback on how that worked out?
• This idea may be rubbish - What about lengthening the daggerboard case back into the seat area (probably about 250mm) to allow the daggerboard to be positioned fore or aft in the slot - One could easily make up a parallogram shaped ply box to fit into the case (a) at the rear when sailing in the original configuration and (b) at the front of the case when sailing in yawl configuration?

Just got to get my life in order (and convince the wife) then its off to the boat plan shop !

Cheers

Originally Posted by White Duck

And I wonder (excuse my deep poor amator structure) wether you made specific plans for this rig configuration or is it only John's initiative?

Welcome Jacques! Since the Aussies should be sleeping right now (or partying into the night...) allow me to respond. The Yawl Rig was a collaboration among: Clint Chase, Boatbuilder; John Goodman, prototype builder-sailor extraordinaire; Michael Storer, designer, teacher, traveler, sailor; and the awesome world-wide contributors to this forum--especially in this specific thread. If you have time--and it will certainly take some time--start reading this Yawl thread from page 1. You'll find all of Clint's logic and rationale, most of MIK's suggestions and encouragement, and much of John's experience and wisdom. The final plan is available from Clint for free:
Dinghies & Skiffs - Maine Boatbuilder + Repairer Wood + Plywood Boats Oarmakers Birdsmouth Mast + Sparmakers Foils Boat Plans + Kits
http://www.clintchaseboatbuilder.com...s/GIS+YAWL.PDF
(Of course, it depends on already having the GIS plans.)

To answer your question about the mainsail, it is not changed from the original at all. The change in the hull is an added position for the main, forward of the normal. John has reported that using the forward position is best when sailing as a Yawl, but he also enjoys the normal rig with no mizzen for quick set up and go. The mizzen adds only ~14% to the total area of the sail plan.

Don't lose any more sleep! But the plan and build the Goat! As we like to say in the US, "come on in, the water's fine."

Originally Posted by Oddball

Ive been thinking of how to build the standard GIS and make it easily adaptible to the yawl version later on if desired...

Greetings Oddball! When I asked myself (and this community) this question, I decided it would be easiest to install the yawl bits during the "normal" build where they will lay in wait until I decide to construct the yawl rig and sail sometime in the future. It saves the work of engineering solutions such as adjustable center case or "external" partner set-up. I'm not against those ideas, but in my mind that would be an exercise in design that would be an alternative to what Clint has come up with. Again, not a bad thing, per se, but I'm inclined to rely on the work that Clint and John have already done, and simply reap the (free) benefits.

Either way, best of luck to you both with the build and with the spousal approval discussion (been there, done that).

Hi Davlafont,

Thanks for the advice ! (Sometimes my inner engineer needs reining in . Different isnt necessarily better.....

Regards

Andy (Oddball)

Hi there Oddball and White Duck!

I'm the one trying the variation on the GIS Yawl of sticking with the original mast position but modifying the centreboard case to enable more adjustment of centreboard position. I basically just made my centreboard case about 2 1/2 inches wider at the top at both the front and back, so I have more room to adjust the centreboard angle and hence the COE position. (The slot in the hull is in the original position) I'm also putting my mizzen mast on the inside of the transom* so I don't have to cut into the aft buoyancy tank.

I'm not far from being able to get out on the water and test this configuration. I have my mizzen mast and sail, the mizzen partner and step are in place, I just have to complete the mizzen boom plus the boomkin and it's attachment to the boat.

Another variation, I'm doing my mizzen with a conventional boom with boom jaws, I wanted to be able to put a 500 mm reef in my mizzen and couldn't see how to manage that easily/what to do with the excess sail after reefing with the sprit boom. I'm figuring the ability to easily reef both the mizzen and the main as the wind gets stronger will help keep everything in balance without that forward mast step.

I'm reluctant to endorse my yawl variation until I've had a chance to try it out, but I'll hopefully be able do so in a couple of weeks time and report back.

I'll have to find a nice enough day to get out and try it, it's getting towards mid winter here now, snow on the mountains, though I did manage to go sailing a couple of weeks ago.

Ian

* Regarding the strength of the transom to support the mizzen in this way, I had a go at the engineering, it came out that with the transom done according to the plans (top frame of 20 x 200 mm oregon or similar and good knees in the corners), and the mizzen done to Clint's specs, if you had the timber mizzen mast in place and put force on it, the mizzen would break before the transom.

Winter sailing on Lake Wakatipu:
Attachment 211904

Oh, by the way, you don't have to make the decision on how to do the yawl modifications for quite a while - just buy the plans and get to work! It only becomes necessary to decide these issues when you are ready to put the buoyancy tank tops on, and/or are making the centreboard case.

Ian

Thank you Ian & Dav for your comments and advices.
But how can I read all this stuff AND don't loose any more sleep ??)
I'm goin' to order those GIS plans ASAP.

Read you in a while
Bonne journée à vous tous !
Jacques

Thanks for helping with that Dave and Ian!

I was in the wilds of the Philippines and my mobile phone didn't provide enough bandwidth to look at webpages. Though it was just enough for short emails via phone.



Cheers
MIK

Well it finally happened. I launched my very own GIS, the "original" yawl. I love the boat and I love having the mizzen. Here is the HERD OF GOATS at the SRR.


P1250546 by capnjon21, on Flickr

Here is my crew/wife Ellie with BLEAT

EllieandBLEAT by Clint Chase Boatbuilder, on Flickr

I have a whole list of things to do based on our sea trials at the SRR. Things went well.

I want to give a shout out to Callsign for his great knowledge of the GIS, Pheonix III sailor Jonathan for helping out, and the wonderful skippers and crews of the SRR fleet for being supportive and sharing in the world record Goat herding.

More on my Skiff soon.

One of the things I am debugging is a crease in the sail.

SRR 2012 - YouTube

If you look at this video frozen at 19s. you can see a short crease from clew to the end of the first batten. No matter how much downhaul I have on, it doesn't go away.

Currently I am thinking that the boom is bending a lot and causing it. I have not played with outhaul tension.

Any thoughts?

Can you ask the sailmaker?