Does anyone out there know the stability index for a 1084 Hunter 34 and the stability index for a 1994 Hunter 40.5? Thanks, Mike
stability index
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It means the 34 is slower to right it's self after capsizing. Now one could argue that a boat that right's itself faster is also harder to roll, but I don't think that's true. A boat with a narrow beam and a heavy ballist will have a low (lower the better) capsize screen number, but a narrow beam is also easier to roll. Now you can argue that the heavy ballist counters that, but I'm not so sure it has that much effect of keeping her up. So, some boats will stay up better, but once they go over, it's harder to get them back up which is very bad because it's easier for water to get into the cabin when the boat is upside down. Now others argue that it's more important to stay up because rolling puts a ton of pressure on the mast and can cause a demasting and most boats that demast that I've read end up sinking due to a hull breach (not sure if it's because when the mast comes off it rips a hole in the deck or because it comes off and slams against the hull until it put a hole in it). Now the safest is definately a wide beam with a very heavy ballist, but that make the boat a slow boat. So pick your poison.
It means the 34 is slower to right it's self after capsizing. Now one could argue that a boat that right's itself faster is also harder to roll, but I don't think that's true. A boat with a narrow beam and a heavy ballist will have a low (lower the better) capsize screen number, but a narrow beam is also easier to roll. Now you can argue that the heavy ballist counters that, but I'm not so sure it has that much effect of keeping her up. So, some boats will stay up better, but once they go over, it's harder to get them back up which is very bad because it's easier for water to get into the cabin when the boat is upside down. Now others argue that it's more important to stay up because rolling puts a ton of pressure on the mast and can cause a demasting and most boats that demast that I've read end up sinking due to a hull breach (not sure if it's because when the mast comes off it rips a hole in the deck or because it comes off and slams against the hull until it put a hole in it). Now the safest is definately a wide beam with a very heavy ballist, but that make the boat a slow boat. So pick your poison.
Stability
There is a web page sailboat design that show how the sail boat parameters are calculated and what they mean.
There is a web page sailboat design that show how the sail boat parameters are calculated and what they mean.
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