Stability information documentation

Crazy Dave Condon · Apr 30, 2014

That sir will be hard unless someone has that as many older files were corrupted years ago due to a ceiling I believe caved in destroying records. There is a process which to do that but not sure what to do. So anyone has any suggestions for this fellow.

Jackdaw · Apr 30, 2014

While not exact, a boat's AVS (Angle of Vanishing Stability) can be estimated by calculation. The more variables taken into account the better the estimate will be. A simple but pretty close calculator can be found here.

http://www.sailingcourse.com/keelboat/cal__avs.htm

Steve Dion · Apr 30, 2014

You may want to check out this website to see if they have what you are looking for.

http://ourlifeatsea.com/sailcalc.html

twalker H260 · Apr 30, 2014

Why are you trying to register it with the compliance program? Is it a recent new import? Even for new imports it won't need a conformity notice/plate if it was imported by you for your own personal use. Also most if not all provisions would not apply as the vessel was built prior to the regulations being put in place.

I went through the process of getting a plate for our 2004 hunter which was imported by a dealer and ended up getting a indicating it was self built. Neither hunter nor the importing dealer had or were willing to provide the information required by transport canada. - in fact neither were aware of the requirement for compliance when we purchased the vessel.
Even getting this required the intervention of a person who sat on one of the boards working with transport canada on this issue.

Here is more info from transport canada - don't remember when requirement came into affect but only applies to new imports and particularly those brought in for resale or by a dealer.

http://www.tc.gc.ca/eng/marinesafety/debs-obs-paperwork-paperwork_notices-120.htm

Also check this document - near the bottom - owner can not be fined for not having a compliance plate/label as long as one was never present.

http://www.tc.gc.ca/eng/marinesafety/debs-obs-paperwork-paperwork_noticesfaq-307.htm#_what_is_a

Scott B · May 15, 2014

Check the links here?

http://forums.hunter.sailboatowners.com/showthread.php?t=158851

Jackdaw · May 15, 2014

As a 25 foot pocket coastal cruiser, it is VERY unlikely that this number was calculated by the designer. The H25 was of a era where this was rarely if ever done by inside designers. Hope you can prove me wrong.

But even if they did, at the time they would have done something VERY simular to the calculation I pointed to. It was of the era before sophisticated computer hull modeling.

Steve Dion · May 15, 2014

Did you try the calculator?

twalker H260 · May 15, 2014

It looks like you've picked a tough one. The pleasure craft regulations won't apply if your using it for commercial purposes. Looking around the transport canada info it looks like the compliance plate still would not necessarily apply

"Small non-pleasure vessels built before April 1, 2005 do not have to meet specific requirements; however, owners and operators are encouraged to verify that their vessels have adequate stability. Ship Safety Bulletin 07/2006 sets out options for verifying stability."

I have not been able to locate the referenced ship safety bulletin but a call to transport canada should be able to locate a copy for you. - unfortunately the simplified verification listed elsewhere likely won't apply since it's not for use with sailing vessels.

Quote above taken from this Transport Canada site.

http://www.tc.gc.ca/eng/marinesafety/debs-vessel-stability-menu-1193.htm

Perhaps a call directly to the office of boating safety might lead you to the info you require for commercial compliance?

Jackdaw · May 22, 2014

Cuna Mara said:
Hi Steve,
Thank you for the link. I did try it and found a number called "Capsize ratio" = 1.9.
Could you share the formula and calculations with me? That might be acceptable to TC.

Capsize ratio (correctly: Capsize Screen) is the LEAST likely value that they would accept. The Capsize Screen is a unitless value dreamed up after the 79 Fastnet race to give a very rough determination of a boats likelihood to capsize. It is very controversial because it does not take into account the length of the boat, which is regarded as the key determinant in whether boats capsize.

FYI the formula is: CS = Beam / (Displacement/64.2)1/3

twalker H260 · May 22, 2014

Here is a link to the ship safety bulletin referenced previously. It lists the acceptable standards, where to locate them and in some cases how to calculate the stability.

http://www.tc.gc.ca/media/documents/marinesafety/ssb-07-2006e.pdf

It doesn't look like a simple formula or two to get the required data!

Stability information documentation

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