Empathy List Archives

M

markn1

Mon, Mar 27, 2006 6:07 PM

Question
Design of sailing cats are much better than those of powercats. Is there
a reason you could not use a sailing cats design and just increase
engine size. From all my research they also have wider hulls and thus
the cabins are bigger. Look at the matrix 76ft sailing cat that were
launched in Cape Town
Thanks Mark

[demime 1.01d removed an attachment of type image/jpeg which had a name of IMG_39161.JPG]

Question Design of sailing cats are much better than those of powercats. Is there a reason you could not use a sailing cats design and just increase engine size. From all my research they also have wider hulls and thus the cabins are bigger. Look at the matrix 76ft sailing cat that were launched in Cape Town Thanks Mark [demime 1.01d removed an attachment of type image/jpeg which had a name of IMG_39161.JPG]

AJ

Arild Jensen

Mon, Mar 27, 2006 6:15 PM

-----Original Message-----
Question
Design of sailing cats are much better than those of powercats. Is there
a reason you could not use a sailing cats design and just increase
engine size. From all my research they also have wider hulls and thus
the cabins are bigger. Look at the matrix 76ft sailing cat that were
launched in Cape Town Thanks Mark

REPLY
Generally speaking, most engine compartments for sailing vessels are not
designed for long term running of the engine. Engine air ducting,
compartment cooling, sometimes sound proofing and exhaust arrangement
are often inadequate compared to similar sized power boats.
If you now also increase engine size that simply aggravates the
situation.

For operating comfort, safety and engine service accessibility you would
need to completely redesign the engine compartmen(s) if using a sailing
cat as a power cat. In addition a number of utility services should be
upgraded in a power cat compared to a sailing cat.

Cheers
Arild

-----Original Message----- Question Design of sailing cats are much better than those of powercats. Is there a reason you could not use a sailing cats design and just increase engine size. From all my research they also have wider hulls and thus the cabins are bigger. Look at the matrix 76ft sailing cat that were launched in Cape Town Thanks Mark REPLY Generally speaking, most engine compartments for sailing vessels are not designed for long term running of the engine. Engine air ducting, compartment cooling, sometimes sound proofing and exhaust arrangement are often inadequate compared to similar sized power boats. If you now also increase engine size that simply aggravates the situation. For operating comfort, safety and engine service accessibility you would need to completely redesign the engine compartmen(s) if using a sailing cat as a power cat. In addition a number of utility services should be upgraded in a power cat compared to a sailing cat. Cheers Arild

M

Mark

Mon, Mar 27, 2006 7:07 PM

If you look back through the archives I believe there was at least one discussion on this. (http://lists.samurai.com/pipermail/power-catamaran/)

If I remember right, above a certain speed typical sailing hulls tend to squat in the rear and cause extra drag. Depending on the design, you may be able to build up the aft section of the hull to give you a little more lift, but as always it would be a compromise.

markn1 markn1@mweb.co.za wrote: Question
Design of sailing cats are much better than those of powercats. Is there
a reason you could not use a sailing cats design and just increase
engine size. From all my research they also have wider hulls and thus
the cabins are bigger. Look at the matrix 76ft sailing cat that were
launched in Cape Town
Thanks Mark

[demime 1.01d removed an attachment of type image/jpeg which had a name of IMG_39161.JPG]

Power-Catamaran Mailing List

If you look back through the archives I believe there was at least one discussion on this. (http://lists.samurai.com/pipermail/power-catamaran/) If I remember right, above a certain speed typical sailing hulls tend to squat in the rear and cause extra drag. Depending on the design, you may be able to build up the aft section of the hull to give you a little more lift, but as always it would be a compromise. markn1 <markn1@mweb.co.za> wrote: Question Design of sailing cats are much better than those of powercats. Is there a reason you could not use a sailing cats design and just increase engine size. From all my research they also have wider hulls and thus the cabins are bigger. Look at the matrix 76ft sailing cat that were launched in Cape Town Thanks Mark [demime 1.01d removed an attachment of type image/jpeg which had a name of IMG_39161.JPG] _______________________________________________ Power-Catamaran Mailing List

GK

Georgs Kolesnikovs

Tue, Mar 28, 2006 3:19 AM

Design of sailing cats are much better than those of powercats. Is there
a reason you could not use a sailing cats design and just increase
engine size.

I don't know of anyone who has produced a good power catamaran by
using sailing hulls. For reasons that might be best explained by
designers who participate in our forum, sailing hulls are unsuitable
for powering 100 percent of the time. There are different dynamics at
play when motoring.

--Georgs

>Design of sailing cats are much better than those of powercats. Is there >a reason you could not use a sailing cats design and just increase >engine size. I don't know of anyone who has produced a good power catamaran by using sailing hulls. For reasons that might be best explained by designers who participate in our forum, sailing hulls are unsuitable for powering 100 percent of the time. There are different dynamics at play when motoring. --Georgs

GK

Georgs Kolesnikovs

Tue, Mar 28, 2006 3:20 AM

If you look back through the archives I believe there was at least
one discussion on this.
(http://lists.samurai.com/pipermail/power-catamaran/)

The best way to search the archives is to use the following protocol at Google:

powering a sailing catamaran site:samurai.com

or similar words, with the key being:

site:samurai.com

The search is by words in subject lines--which only reinforces how
important it is to have specific subjects on all posts.

--Georgs

Georgs Kolesnikovs
Power Catamaran World
http://www.powercatamaranworld.com

>If you look back through the archives I believe there was at least >one discussion on this. >(http://lists.samurai.com/pipermail/power-catamaran/) The best way to search the archives is to use the following protocol at Google: powering a sailing catamaran site:samurai.com or similar words, with the key being: site:samurai.com The search is by words in subject lines--which only reinforces how important it is to have specific subjects on all posts. --Georgs -- Georgs Kolesnikovs Power Catamaran World http://www.powercatamaranworld.com

power-catamaran@lists.trawlering.com

FW:

--Georgs