[MHml] Transom design for a cat

[Andre Burity]

I believe immersed transoms only work without a drag penalty on  
narrow waterline beam like Chris White catamarans. Try it on a  
usually wider transom of a cruising cat and the drag will be  
significant.
One thing I know from experience, as my boat has transoms clear of  
the water, is that they are a lot noisier at anchor as small waves  
slap under it specially on windy days.
Another thing to consider is that non-immersed transom hulls squat  
more under power because of a more pronounced rocker at the stern  
(assuming two hulls with the same LWL, the one with immersed transoms  
will have less rocker at the stern). That brings the rocker into the  
equation and its implications and variables, which is beyond the  
little that I know.

Andre
On Jan 31, 2007, at 3:11 AM, Alan Christoffersen wrote:

> Martin Schöön skrev:
>> On 1/31/07, Alan Christoffersen <alan at insatech.com> wrote:
>>
>>> I am working on the design of a 45 foot performance cruiser - and  
>>> need some
>>> help as to the design of the transoms.
>>>