limit of positive stability

[RLMcLaury]

My 34 Hunter is off the the regatta al sol race from Pensacola to the Isla de Mujeres, Mexico. To assure myself and the crew about the safety of the boat, I would like to know the limit of positrive stability for this model. It was constructed in 1983. Has anyone found this number for this boat?thanks,Ralph Mc.

 

[bob]

h34 capsize screen

another calculation is the capsize screen...i can't explain all the factors but some naval architects say that a number of 2.00 or below indicates a safe stability for an offshore boat... the number for the h34 is 2.03..that's about average for a modern design...many knowlegeable people say that calucation is simply one of many factor....

 

[Alex Pascu]

Hunter should address this issue..and more

In last 2 years most new boat tests in European most serious sailing magazines include this data , along with the whole graph of stability curve from 0 to 180 degrees ,gladly submited by designer/builders to potential buyers . It shows more information than the 'point of no return'/'limit of positive stability' or 'capsize screen' , and it is more eassily understood.For shure Hunter has this data ;it is a basic safety feature of design ,aknowledged for decades.I would advise Hunter to join these 'big names' in production sailboats thatsubmit and advertize on regular basis this data , both for new and some older boats ( up to about 10 years).

 

[RLMcLaury]

limit of positive stabikity

Thanks for the replies. I am using a number of about 115-120 degrees. Can anyhone confirm that is the limit of positive stability for the Hunter 34?Regards,mac

 

[Alex Pascu]

More

If 115-120 was the data suplied to you ,it is almost average for a medium-light displacement mass-production coastal cruiser/racer , which have mostly about 120-125 . Ofshore designed sailboat has mostly 130-140 degrees ,but a lot of production boats with around 120 ,if strong , good condition and adequently mentained ,did and do ofshore sailing (while carefully planning for the weather , a thing one cannot really do for ocean crossing.. ).My friend did the ARC (Atlantic crossing and back) 10 years ago in a production second hand Moody 31 foot..) However , be aware that added-on in-mast furling , radar dome on mast ,on deck liferaft and fuel-water jerrycans , etc.,things added above cabin-floor level, and especially on deck and higher , have a big effect on lowering this 'point of no return'.Studies have shown that such add-on's on everage size modern cruiser racer ,can lower it from 120 to as low as 95-100 , which is about the point when the tip of your mast will touch the water.!!

 

[PJ]

Calculated Static Stability

I own a H34 84 model, deep keel and have a set of polar diagrams from US Sailing. If you are interested give me a email or call and we can discuss and arrange to fax you a copy. I feel anyone buying a boat to race or do any serious cruising should look at a set of polars. For the club/bouy racing you can get by with observing your competition and crew on to see if you feel comfortable with the handling, but for offshore work I'd really like to know the boats heeling/stability & righting angles before I write the check.BOLPJemail dhart34278@aol.comhome-office phone 847.543.0016