BoatBanter.com - View Single Post - Urgent ! Can anyone understand these safety data ?

wrote:
Gary wrote:

Okay, my turn again. I just googled you and see you may
be a Nav Arch. So why don't you calculate the AVS?

I am quite confident (and I am not a Nav Arch) that the boat
will have a better stability curve than is represented by the
one posted.

If it doesn't, and it has an AVS of 110, I wouldn't touch it
for anything but coastal wandering. It will surprise me
because the AVS claims for the 460 are 0 degrees on all the
Tayana websites and the other Harris boats are so seaworthy.

Really though, since we are not doing the buying, this is
just an interesting discussion. No need to get ****ed off.

The report including the curve was sent to me by Tayana's
engineer named Basil last Sunday (Monday in Taiwan).

"Nice to talk with you. Re AVS of Vancouver 460 is 110 degrees.
.. Enclosed the report of inclining experiment total 3 pages.
The last page shown the GZ curve. Please let me know if you
have more questions."

The AVS was probably determined from the curve but I don't
know if they actually closed all the hatches and turned the
boat upside down for the inclining experiment :-)

BTW, didn't somebody recommend a Catalina (with an AVS of 105)
over this Tayana and the Beneteaus for crossing the Pacific ?
When they do an inclining experiment with a boat they just force it to
incline by putting weights a certain distance from the centreline and
then calculate all the numbers from that data. They don't turn the boat
over. Everything on the boat is supposed to be in normal operating
condition.

When people on this group or anywhere recommend things like the Catalina
you have to take it all with a grain of salt. Remember this is just a
news group. I could be a 12 year old.

Finally your questions, although thought provoking and the basis for
good discussion, are kind of revealing when it comes to your level of
seamanship and experience. You could probably sail just about any 46
foot modern boat just about anywhere. The differences are nuances and
margins of safety. Almost no-one buys a boat based solely on it's
stability curves. In fact the open 60s/70s currently racing around the
globe have terrible stability profiles, so much so that they have to
prove that they can right them once tipped. They are sailing in extreme
conditions on the edge of control.

As Adlard Coles often says in his "Heavy Weather Sailing" classic' it
is the skill of the crew that is the biggest factor in the safety of the
boat. (You should read it) A 30' breaking wave will capsize any poorly
handled 45 foot boat on a bad day.

Gaz