AIT Around In Ten

if you stack the weights along the centre line in the middle of the tub it does not self right unless you touch it, a gentle touch causes it to snap upright very fast

 

B'Tugly

Anyone with an open mind care to share thoughts on the Triloboats take on this? http://www.triloboats.com/AiT10x4.pdf

http://youtu.be/Jm_55in8wL4



Windows are too big for me, but that is an easy fix.

Bryan

 

That's one of the reasons fore the "Capsize Screening Formula". It favors heavier boats primarily because, if they float upright and carry sail at all, the will probably right from a total capsize.

The reason for this is because they have a great deal of weight for their water plane area, and get much of their initial stability from weight distribution, rather than leeward buoyancy shift.

A lighter margarine tub, even with the same VCG as the one in your experiment might end up depressingly stable upside down. There's at least one "Open 60", I know of, that capsized and stayed inverted for months, even though the deep, bulb keel was still intact.

An AIT boat is going to have a nearly full length waterline and a D/L of close to 1,000.

My "Football" concept has one of 780, and it is intended to make the voyage in hops.

The Yrvin 10 is supposed to weight in at at least a ton when it leaves port, IIFRC. It is really more of an ark than a sailboat. It may make it for this reason.

 

I'm new here, and this is the first time I've heard of AIT but it doesn't surprise me. Lots of people choose to go as compact and stuff-free as possible. Not all of them can make it, of course, but that's how it is. I've lived in some pretty small spaces, but I wouldn't want to sail and live on a 10-footer. Just not my thing.

 

Discussion on what is a swim platform

http://www.boatdesign.net/forums/all-things-boats-and-boating/yrvind-39341-26.html#post680734

 

What's an AIT swim platform is discussed there, your link leads to post #376 but this discussion started at post #359 and continues intermittently through the following pages.

 

B'tugly

So I am interested in an affordable, relatively fast build boat that is capable of handling some rough water. In my case that means Puget Sound. I won't cross oceans.

BTugly has a cross section that is not unlike a shoe box. That would imply that once it gets on its side or upside down it would stay that way.

But could someone help me with this thought? The top would be rounded, and the sides would have the ballasted box keel hanging off the side. There would be 500 pounds of ballast in the bottom of the boat. There would also be weighted sideboards. With the skipper shifting his own weight inside, would that ballast and skipper movement still not be enough to right the boat?



http://www.triloboats.com/AiT10x4.pdf

 

Shantyboat It's not my style to criticise other peoples designs but you should rather look for something else.
The hull is 10% of the work so by building a box you save VERY LITTLE.

http://www.bateau.com/proddetail.php?prod=AD14&cat=14#.Uy8urTOKC00

http://www.microcruising.com/swampthing1.htm

there are lots out there just start searching

 

Manie, here is a frenchman who was removed from his little boat in Torres Strait a few months back. He was 100 days out from french polynesia, his starting point. The boats name is "April Fool"

 

Reading more now interesting

 

Something I do not understand: Experienced bluewater sailors please help me out.
Sailing these small boats, there seems to be a very high probability of being knocked over. I was watching the video of Ant Steward over the weekend, who went around on an open boat, which was a modified Dix TLC19, and he was knocked down many, many times.
I also am happy to get my head around the fact that with the correct ballast ratio and position, the boat will self-right given enough wave action( If I remember that was the main mechanism of righting on capsized yachts, and not anything the crew does.)
What I wonder about is the probability of the rig surviving a knockdown, and whether it can withstand the violent loads incurred during repeated knockdowns/capsizings?
How do you improve your chances of being able to carry on sailing?
The rig on the boat which Rayman posted, I see that stick breaking off on the first roll.
Or am I missing something?

 

That's not April Fool and Hugo Vihlen

it is Daniel Alary on Poisson D'Avril

http://www.couriermail.com.au/news/...in-torres-strait/story-fnihsrf2-1226676179898

 

Right - that typifies *exactly* my objections to this sort of caper.

He got in trouble, he triggered an EPIRB and we went and saved his butt. At our expense and at the risk of our SAR people.

I've said it before but it bears repeating for those who deliberately miss the point - if you want to go and do something like this, either take out insurance against being rescued or go without an EPIRB and take your chances on survival. I don't care which, but pick one. I don't want to stop you going but I think it's foolish and I don't want to pay for the likely rescue.

What this is doing is basically outsourcing your risk and rescue expenses to someone else who did NOT volunteer for it. The end result is going to be more restrictive rules and more expenses for everyone.

So Manie, if you want to say try South Africa to Australia in a 10' boat, more power to you, but I do not want to have to pay for the SAR expenses if something goes wrong, OK?

PDW

 

I think, in your case, with a triple keel design, the lead should be quite short and not include the rudder.

There are three reasons for this:

1.) Is the triple keels. The lee most keel will be the deepest when the boat is heeled and will be providing most of the lift. Along with most of the lift comes most of the drag. This increased drag will cause the boat to turn away from the wind, not towards it.

2.) Is the hull form itself. Essentially what I see here is a symmetrical ended pram. Instead of producing a bow wave, which will be higher on the leeward side, and tend to push the bow upwind, there will be hull surface drag, greater on the leeward side, tending to pull the bow to leeward.

3.) The height of the rig is relatively modest and its CA is closer to the hull center line, when the boom is let out, due to the balanced lug rig.

I wouldn't include the rudder, because locking it centered will move the CLA quite far aft, making the boat more stable downwind.

 

sharpii2 - very good points thanks, I like it all, good one.

pdwiley the boat is not to blame - even if he was on a bigger boat it would have been a problem anyway
But one thing is for sure - Australia wont see me. We have many friends and family scattered all over OZ and it's not paradise either.
Australia has bigger problems and DAILY costs with refugees on the water than the odd lonely sailor that might come by every ten years

BUT he should have avoided OZ because he should have known that they have very strict rules and regulations.