Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 17-02-2016, 02:59   #16
Registered User

Join Date: Dec 2014
Location: the Med
Boat: Nauta 54' by Scott Kaufman/S&S - 1989
Posts: 1,060
Images: 3
Re: How Crazy is it to get your boat LONGER ?

Atoll,
can we say that bows and stern are all alike, whatever the boat ?

Yes, indeed
__________________

__________________
TheThunderbird is offline   Reply With Quote
Old 17-02-2016, 03:20   #17
Freelance Delivery Skipper..
 
boatman61's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Jan 2010
Location: UK/Portugal
Posts: 20,203
Images: 2
Send a message via Skype™ to boatman61
pirate Re: How Crazy is it to get your boat LONGER ?

From what I can understand you are talking about storing toys in your transom..
Know at least one Jongert that does that.. they keep his Harley FLH and her Harley Custom along with the RIB in the transom of their boat.
Hydraulic drawbridge stern lowers and one rides out onto the jetty..
Mind.. it was a built to order 1 off 19m+ boat.
__________________


Born To Be Wild
boatman61 is online now   Reply With Quote
Old 17-02-2016, 03:48   #18
Registered User

Join Date: Dec 2014
Location: the Med
Boat: Nauta 54' by Scott Kaufman/S&S - 1989
Posts: 1,060
Images: 3
Re: How Crazy is it to get your boat LONGER ?

Great! I meant less extreme toys indeed (I have an MVAgusta 1000 ashore)

Ropes, fenders, scuba gear, a wet cupboard, fishing gear, hose pipes, a cumbersome Dinghy... And a rigid dink on deck, plus tiilting Solar panels, a garden for herbs now in the cockpit....endless possibilities...

Jongert sport full size stern sections, a nauta54 resembles a Swan of the same era and size (and drawing board)

Boatman, kudos, it is your second ever non-ironic contribution of yours after months... I feel pleased ��
Fair winds to all

PS I am mech. Eng. and have contacted a structural engineer, my old time friend teaching at Uni...we'll see

PS yes a trial bike like a Montesa could be nice to park on stern... Arg arg arghh!!
__________________
TheThunderbird is offline   Reply With Quote
Old 17-02-2016, 03:54   #19
Registered User

Join Date: Jan 2016
Posts: 429
Re: How Crazy is it to get your boat LONGER ?

My boat's already hideously ugly so that part wouldn't bother me too much.

Some trepidation about how it might behave in a decent following or quartering sea though.
__________________
unclemack is offline   Reply With Quote
Old 17-02-2016, 03:56   #20
Freelance Delivery Skipper..
 
boatman61's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Jan 2010
Location: UK/Portugal
Posts: 20,203
Images: 2
Send a message via Skype™ to boatman61
pirate Re: How Crazy is it to get your boat LONGER ?

Quote:
Originally Posted by TheThunderbird View Post
Great! I meant less extreme toys indeed (I have an MVAgusta 1000 ashore)

Ropes, fenders, scuba gear, a wet cupboard, fishing gear, hose pipes, a cumbersome Dinghy... And a rigid dink on deck, plus tiilting Solar panels, a garden for herbs now in the cockpit....endless possibilities...

Jongert sport full size stern sections, a nauta54 resembles a Swan of the same era and size (and drawing board)

Boatman, kudos, it is your second ever non-ironic contribution of yours after months... I feel pleased ��
Fair winds to all

PS I am mech. Eng. and have contacted a structural engineer, my old time friend teaching at Uni...we'll see

PS yes a trial bike like a Montesa could be nice to park on stern... Arg arg arghh!!
You keep Count...??
I Feel Honoured....
__________________


Born To Be Wild
boatman61 is online now   Reply With Quote
Old 17-02-2016, 04:12   #21
Registered User

Join Date: Jan 2016
Posts: 429
Re: How Crazy is it to get your boat LONGER ?

Quote:
Originally Posted by boatman61 View Post
You keep Count...??
I Feel Honoured....
And maybe a little bit... stalked?
Heh heh
__________________
unclemack is offline   Reply With Quote
Old 17-02-2016, 04:29   #22
Freelance Delivery Skipper..
 
boatman61's Avatar

Community Sponsor
Cruisers Forum Supporter

Join Date: Jan 2010
Location: UK/Portugal
Posts: 20,203
Images: 2
Send a message via Skype™ to boatman61
pirate Re: How Crazy is it to get your boat LONGER ?

Quote:
Originally Posted by unclemack View Post
And maybe a little bit... stalked?
Heh heh
Only if it was True...!!
Forums are like deliveries, work, some marriage's...
Only the shitty stuffs remembered...
__________________


Born To Be Wild
boatman61 is online now   Reply With Quote
Old 17-02-2016, 07:04   #23
Registered User

Join Date: Nov 2013
Location: Slidell, La.
Boat: Morgan Classic 33
Posts: 1,102
Re: How Crazy is it to get your boat LONGER ?

Is this your boat? If so, certainly you could do it, though if you followed the existing lines you'd end up with an almost canoe stern. Depending on your stern wave now, it may or may not affect seaworthiness in following seas. With the existing swept stern, you could probably add 6 feet of deck without adding much (if any) at all to where the 'addition' joins the lower point of the hull, just above the waterline, as long as you were willing to have an overhanging rather than a swept stern.

Strength wise, assuming you have a fiberglass hull, then the addition could be made with glass and any of the various structural foams in situ, or built off the boat and then attached with bolts and glass, and then faired in and painted. If it had no rigging stresses involved, the main force to worry about would be the effects of waves, but since there's no real reason to alter the existing hull at all (unless you for some reason want to penetrate the existing transom), there should be no problem making the hull addition just as strong as the original hull. I would be leery of attaching mooring cleats to the addition unless it was specifically engineered for them though.

To me the main question would be how the value of the boat changed. I'm guessing, depending on finishing and accoutrements, 25-40000 USD or maybe more to make the change, and in the end, even if done to the highest standards, will it wind up devaluing the boat?







And by the way I've actually done this, though on a much smaller scale, in conjunction with recoring and repowering a 24 foot fishing boat. We changed it into a 27.5 foot fishing/diving boat, the extra 3.5 feet is proportionally about the same as the change you propose, the difference is that on this boat the addition was load bearing, as we built in a slight negative camber to help lift the (slightly underpowered) boat on plane.
Attached Thumbnails
Click image for larger version

Name:	01.jpg
Views:	72
Size:	162.2 KB
ID:	119156   Click image for larger version

Name:	02.jpg
Views:	68
Size:	149.2 KB
ID:	119157  

Click image for larger version

Name:	03.jpg
Views:	82
Size:	141.1 KB
ID:	119158  
__________________
jimbunyard is offline   Reply With Quote
Old 17-02-2016, 07:19   #24
Registered User

Join Date: Oct 2010
Location: Abaco, Bahamas/ Western NC
Boat: Nothing large at the moment
Posts: 820
Re: How Crazy is it to get your boat LONGER ?

If it is a metal boat it may be worth considering. If it is GRP forget it. Best suggestion was to purchase larger boat. My compliments on your vocabulary and grammar.
__________________
Tingum is offline   Reply With Quote
Old 17-02-2016, 11:02   #25
Registered User

Join Date: Mar 2011
Location: fl- various marinas
Boat: morgan O/I 33' sloop
Posts: 1,097
Re: How Crazy is it to get your boat LONGER ?

I generally try to be positive but that's not easy on this one. The idea that adding substantial weight and displacement while changing the lines of the boat will work out well is pretty far out. Navel architects are not generally considered a luxury that is optional. On the other hand, I seriously doubt that you could find one to participate in your experiment.
In short, the answer is that the idea is very crazy! It might work but I would certainly not bet on it.
__________________
Dave22q is online now   Reply With Quote
Old 17-02-2016, 11:11   #26
Registered User
 
Sailor Doug's Avatar

Join Date: Jan 2010
Location: Lake Erie
Boat: H36
Posts: 384
Re: How Crazy is it to get your boat LONGER ?

Simple less expensive solution. A friend of mine had a deck level stern platform add to his 54' sail boat. I believe it was 6-8 long. Deck was teak strips with stainless supports. Big enough to carry dingy with out board. Hatch in new deck to boarding ladder. This would be a lighter less expensive solution.


Sent from my iPad using Cruisers Sailing Forum
__________________
Sailor Doug is offline   Reply With Quote
Old 17-02-2016, 11:30   #27
Registered User

Join Date: Dec 2014
Posts: 591
Re: How Crazy is it to get your boat LONGER ?

Go for it, hull extensions are not rockets science. Done frequently in boatyards. 6-8ft in GRP, not that much weight. A catamaran (more difficult yet) was done on ''YouTube'' by owner. I just hate uninformed negativity.
__________________
captlloyd is offline   Reply With Quote
Old 17-02-2016, 12:28   #28
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,812
Re: How Crazy is it to get your boat LONGER ?

Hull extensions are not rocket science.... on a power boat. Adding 8 feet to the stern of the 54 foot sailboat, changes the center of motion. The mast and fin keel would be too far forward then. It would, I think, effect sailing performance, perhaps with a tad too much weather helm.

Many manufactures do add feet to the center of the boat when they take an existing design and make it longer. But they also adjust the keel and mast dimensions so the boat stays balanced. Adding 8 to 10 feet to the stern of an existing sailboat, would adversely effect hull balance.

Can it be done. Sure. Should it be done, that is the question.

I think a naval architect or the manufacturer might be a better one to contact.
__________________
sailorchic34 is offline   Reply With Quote
Old 18-02-2016, 16:40   #29
Registered User
 
Luther's Avatar

Join Date: Oct 2014
Location: Florida
Boat: Cheoy Lee PH43
Posts: 26
Re: How Crazy is it to get your boat LONGER ?

I grew up on my Dad's replica of a Rio de la Plata whale (pilot?) boat. When he built it he added a few inches between each frame which extended her from 32' to 37'.
She was beautiful, sailed well and was a great heavy weather boat (Cook Strait!) but had significant weather helm on the wind. A longer bowsprit improved that a lot.
__________________
Luther is offline   Reply With Quote
Old 19-02-2016, 04:03   #30
Registered User

Join Date: Dec 2014
Location: the Med
Boat: Nauta 54' by Scott Kaufman/S&S - 1989
Posts: 1,060
Images: 3
Re: How Crazy is it to get your boat LONGER ?

I am in Holland, busy at contacting yards working Alu plates

I am encouraged to go further, and believe Alu is best for the purpose.

I keep you posted..

Thanks to all....��
__________________

__________________
TheThunderbird is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
My favorite boat cap is no longer avail cabo_sailor Off Topic Forum 3 01-04-2015 20:45
Am I Crazy?: My Plan to Learn to Sail and Get Offshore EGB14 Our Community 28 05-01-2015 04:37
AC72....Crazy Cool and Cool Crazy Ocean Girl General Sailing Forum 6 30-08-2013 06:22
Wanted: 12' 6" or Longer Boom clausont Classifieds Archive 2 16-01-2008 08:43
No longer a lurker Ativa Meets & Greets 7 07-02-2007 15:30



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:19.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.