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Old 08-02-2008, 12:05   #1
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Stern extension?

Stern extension?

How much does it cost to extend the sterns of a 40ish foot cat?

We will be carring a large RIB and large solar area on the aft and it seams a popular solution to maintain balance and increase water line. Intuitively I would assume it would help in bridge deck clearance as well. Are there any issues with this approach.
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Old 08-02-2008, 12:10   #2
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I have seen a few of these cats done this way at the Miami catamaran club and they would know I think
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Old 08-02-2008, 13:32   #3
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One issue is the rocker of the bottom as it approaches the waterline. I have seen a few boats with the mod that you want that did not follow the rocker (because to do so would place the step too high out of the water) and it looked terrible. The challenge is to make it look as if it was part of the original design.

I have seen a couple Macgregor 36s done beautifully.
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Old 08-02-2008, 13:35   #4
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On a mono hull I was quoted $20k to 30 k B/c it meant a whole new topsides paint job.
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Old 10-02-2008, 13:14   #5
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Originally Posted by Brandywine View Post
Stern extension?

How much does it cost to extend the sterns of a 40ish foot cat?

We will be carring a large RIB and large solar area on the aft and it seams a popular solution to maintain balance and increase water line. Intuitively I would assume it would help in bridge deck clearance as well. Are there any issues with this approach.
i had a boatyard extend my cat 4 years ago in the uk , it was a simple operation , its just g r p ! the existing steps were cut out , 650mm added to hulls using 4mm hardboard screwed onto the existing hull profile , tapering along the same lines ,cloth and grp layed up and then reduced/tapered steps re- fitted it was a simple , straightforward operation , i gained 630mm in total , result ? better seakeeping ,speed ,stability and aesthetics go for it !
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Old 10-02-2008, 14:28   #6
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Quote:
Originally Posted by Brandywine View Post
Stern extension?

How much does it cost to extend the sterns of a 40ish foot cat?

We will be carring a large RIB and large solar area on the aft and it seams a popular solution to maintain balance and increase water line. Intuitively I would assume it would help in bridge deck clearance as well. Are there any issues with this approach.

Hi,

Here is a very full description of a beautifully done job on a cat.

KatieKat 2007 Cruise Chapter Six

I'm sure Joe would be willing to answer any further questions you have

Regards

Alan
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Old 10-02-2008, 18:39   #7
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Thank you what a great article... has anyone ever heard of a bad experience with lengthened hulls not related to the quality of the work?
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