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Old 21-07-2016, 17:12   #16
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Re: Choosing a Cat - Bridge deck clearance

Are there any CE regulations in regards to bridge deck clearances?

My understanding there are some requirements in regards to escape hatches for above the 40 foot length cats so would be interesting if the if Brussels has also legislated for Bridge Deck Clearances on Sailing Cats?
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Old 21-07-2016, 17:34   #17
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Re: Choosing a Cat - Bridge deck clearance

Hobie 18 or one with a tramp between the hulls. These are the only type of cats I ever enjoyed sailing on.http://www.cruisersforum.com/images/.../whistling.gif
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Old 23-07-2016, 19:34   #18
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Re: Choosing a Cat - Bridge deck clearance

Catamaran stability = beam and buoyancy and this translates into slamming and bridge deck clearance. Acceptable bridge deck clearance is 5% of LOA, good clearance is 6% of LOA. A good offshore catamaran requires good buoyancy forward and a robust COG so that when it is going to weather it is climbing the wave before the chest comes into play. The length of the bridge deck is important in that the convergence of the bow waves on the inside of the bows should be behind the aft is the bridge deck or you will have "drumming". You can see more on this subject on catamaranguru.com


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Old 24-07-2016, 03:53   #19
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Re: Choosing a Cat - Bridge deck clearance

Best to test sail the boat you are looking for to determine the performance , underwing clearance from 75 to 120 cm is not that relevant to hull slamming as you need to consider all aspects of the water line length to beam design, it not just one aspect in isolation,
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Old 24-07-2016, 17:02   #20
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Re: Choosing a Cat - Bridge deck clearance

Quote:
Originally Posted by Andrew Grace View Post
Best to test sail the boat you are looking for to determine the performance , underwing clearance from 75 to 120 cm is not that relevant to hull slamming as you need to consider all aspects of the water line length to beam design, it not just one aspect in isolation,
Trying to arrange a test sail in the kind of conditions that will really show this aspect of a boat is problematic.
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