[PCW] Sailability of powercat hulls - was Hybrid Powercats

[Captnlen]

the Trikini 6.47 swing wing had an inboard diesel. the OR had a dihedral 
of about 5 degrees in sailing position and this did produce in some 
condition a rolling motion.  But swung aft  they were 4 1/2 ft aft and 
the dihedral was gone and the power was much more comfortable.

This was not a deliberate aim in the design but something that was 
observed in usage.  This was in 76-80 era

Noelle Harrott wrote:

>It would seem that the varying requirements of hull shapes for optimum 
>sailing or powering could be adressed by a trimaran motorsailer with 
>variable position sponsons. Have there been any design attempts along this 
>line of thought?
>
>                               Curious, Bert
>----- Original Message ----- 
>From: "Mark" <mark424x at yahoo.com>
>To: "Power Catamaran List" <power-catamaran at lists.samurai.com>
>Sent: Wednesday, December 19, 2007 8:02 AM
>Subject: Re: [PCW] Sailability of powercat hulls - was Hybrid Powercats
>
>
>  
>
>>--- On Mon, 12/17/07, Malcolm Tennant <malcolm at tennantdesign.co.nz> wrote:
>>    
>>
>>>However I might deviate slightly from that contention and
>>>fit a rig to one of
>>>our CS power cat designs. The only real advantages of this
>>>would occur if you
>>>wanted to go a bit faster  than the sail boat hull was
>>>capable of.
>>>      
>>>
>>----------------------
>>
>>Malcolm, Pat, et al
>>
>>I wonder if you could comment on the sailing ability of a power cat hull 
>>(e.g. CS hull form).  There has been much discussion of squatting of a 
>>traditional sailing hull that limits powering speed.
>>
>>A designer/builder of both power and sail cruising cats once told me that 
>>since the force generated by the sails is so far above the water line that 
>>sailing hulls needed much more buoyancy forward - and as the force applied 
>>by props was along such a different line, that the a motorsailor would 
>>always involve a heavy compromise in sailing/powering or both due to the 
>>requirements of different hull shapes for sail v power.
>>
>>Thanks -- Mark
>>_______________________________________________
>>Power-Catamaran Mailing List
>>
>>
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-- 
Live Long and Prosper
Capt. Len Susman, retired
trikini23 at trikini.com 
After Dec. 13,2007
Email : trikini2007 at comcast.net                    
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