Hull Extensions

Post here if you want to discuss a topic specific to the PDQ Capella.
User avatar
PDQ-Dave
skipper
skipper
Posts: 68
Joined: Sun Mar 09, 2008 8:52 pm
Contact:

Hull Extensions

Post by PDQ-Dave »

The Hull Extension Project is complete on PDQ #36068 "Pacfica" she is now 39'. For progress pictures and the completed project including sailing videos see:

http://www.PDQ36.blogspot.com
Attachments
IMG_3477.JPG
IMG_3477.JPG (56.46 KiB) Viewed 25173 times
Last edited by PDQ-Dave on Sun Nov 09, 2008 10:38 am, edited 3 times in total.
Dave Kane
Previous owner of Pacifica #36068
http://www.DKsail.com
http://www.PDQ36.blogspot.com
User avatar
Ed Ellis
admiral
admiral
Posts: 168
Joined: Mon May 17, 2004 10:48 pm
Location: Soldier Creek / Perdido Bay, AL

Re: Hull Extensions

Post by Ed Ellis »

I'd thought (briefly) about this many times, so be sure and let everyone know if you do it and how it turns out, Ed
Ed & Linda Ellis
Tranquility
User avatar
Cat Tales
admiral
admiral
Posts: 257
Joined: Tue Sep 06, 2005 7:20 pm
Location: Boynton Beach, FL (36081)
Contact:

Re: Hull Extensions

Post by Cat Tales »

I also thought about this a few times in the past year and have about 15-20 more detailed pictures of a Seawind hull extension if anyone is interested. Just let me know your email address and I'll send them out.

Dave, keep us updated on the progress because there may be others interested (me for instance) if you are going to have molds fabricated.

Chris
Chris & Kelly Haretos
Formally of s/v Cat Tales, 36081
Boynton Beach, FL
User avatar
PDQ-Dave
skipper
skipper
Posts: 68
Joined: Sun Mar 09, 2008 8:52 pm
Contact:

Re: Hull Extensions

Post by PDQ-Dave »

Chris,

I'd love to see more progress pictures of the Seawind.
Please email me at: (first part phonetic... to avoid spam): delta bravo kilo alpha november echo @ gmail.com

I'll be sure to document progress on my blog at: http://www.PDQ36.blogspot.com

Dave
Last edited by PDQ-Dave on Mon Sep 22, 2008 7:27 pm, edited 1 time in total.
Dave Kane
Previous owner of Pacifica #36068
http://www.DKsail.com
http://www.PDQ36.blogspot.com
User avatar
Page 83
admiral
admiral
Posts: 455
Joined: Sat May 08, 2004 11:48 pm
Location: Annapolis, Md. 36026

Re: Hull Extensions

Post by Page 83 »

I watched two Seawind 1000s get extensions at Herrington HarboUr North Marina two years ago. The process was a lot more complicated than glueing on new tails. They did dramatically improve the sailing characteristics of the boats in all the obvious ways, on all points of sail, more than compensating for the additional wetted surface area. They even looked better afterwards. Then earlier this year the marina crew lost control of a big monohull under tow, and ran it over one of the scoops. It was very well made, fairly easily repaired, and the boat did not take on water. The only hesitation I would have about doing the same for SV Squatty (AKA Page 83) would be financial. I think they paid somewhere around $20,000.
Sandy Daugherty "Page 83" PDQ 36026
User avatar
36041
admiral
admiral
Posts: 162
Joined: Fri Aug 20, 2004 4:57 am
Contact:

Re: Hull Extensions

Post by 36041 »

Sandy,

The year we left for the Bahamas (2003 or 2004) I saw Ite Oha Oha, a Seawind 33, (I think) get her extensions done at Herrington Harbour North. I can't remember the owner's name but he was pretty cool to talk to and was very impressed with the changes the extensions made to his boat. I also have some hi-res pictures of the procedure at several different stages if anyone is interested.

I want to say that he said the final cost was close to 20k, but I think that was just for the work at the yard. He had bought the molded extensions from someone in Florida and when they arrived they were both made for the same side of the boat. Unfortunately, the hull is not symmetric and one mold had to be extensively reworked to fit properly.

An engineer friend and I sat down in Georgetown two years ago and calculated that if we were to add the same style addition to Dream Catcher, it would result in 400 to 450 pounds of additional lift (via increased displacement - assuming ~60 lbs of flotation per cubic foot) to the back end of the boat. I figure that's worth maybe two to three inches at the water line on the back of our boat.

My engineer friend also drew up some fairly detailed plans on how he would attach extensions to our PDQ. They entailed cutting through the verticle surface of our bottom transom step, inboard of the hull and running stringers to be glassed to either side of the inside of the hull (long ways). From there he went on to describe how to build up the extension so it would be an integral piece of the hull and not prone to snapping off. The hardest part seemed to be the fairing of the new structure to the existing camber of the hull, but he seemed to think it was doable, but would take considerable time to do a good job on.

If anyone is interested I'll ask if it's ok to post his ideas and plans either here or with Sam over at pdq36.com. Anyhow, I wasn't paying him for his expertise and it was more of a napkin talk than anything else. Just my two cents worth.

Tom
PDQ 36041
www.tendervittles.net
User avatar
PDQ-Dave
skipper
skipper
Posts: 68
Joined: Sun Mar 09, 2008 8:52 pm
Contact:

Re: Hull Extensions

Post by PDQ-Dave »

Tom,

Any and all additional thoughts, sketches or estimations in regard to the hull extension would be much appreciated.
Dave Kane
Previous owner of Pacifica #36068
http://www.DKsail.com
http://www.PDQ36.blogspot.com
doubledutch
admiral
admiral
Posts: 169
Joined: Fri May 07, 2004 2:23 pm
Location: Ontario (32043)

Re: Hull Extensions

Post by doubledutch »

I plan to add a bit to my 32 hulls when I get the time - it does not seem to me that the process should be all that difficult or expensive.

There is a good description of the process with photos and a review of results on a Seawind 1000 at http://www.instantweb.com/s/siudzinski/ ... tml#091207
User avatar
Page 83
admiral
admiral
Posts: 455
Joined: Sat May 08, 2004 11:48 pm
Location: Annapolis, Md. 36026

Re: Hull Extensions

Post by Page 83 »

Hi Tom. Its 11 AM and 94 degrees outside in Edgewater. Marinetex cooks off in my hand while I'm still stirring it. Page 83 has gaping holes in the deck and interior surfaces and clouds of grindings drifting around; waiting for all those gadgets I bought, which are gathering dust on the coffee table. You, I hope, are lobster hunting. What's the right font for 'jealous'?

Did that cocktail napkin address building around the backstay chainplates? Did it perhaps have a nice swim platform on the inboard side?

I asked Simon about extensions at a boatshow several years ago. He was non-committal, but allowed as how it wouldn't be much of a problem to extend the lines of the aft hulls in a single rather than a compound curve.

The big question is whether and how much this work would be worth to each of us. What would we pay to carry yet more weight in back, and gain a half knot in light air? Slip fees and possible insurance would go up. The boat would be out of commision and on the hard for several weeks. It would entail cutting a huge hole in the transom. It would have to be cheaper than selling the boat and buying something bigger [shudder].

I'm in for $15,000.
Sandy Daugherty "Page 83" PDQ 36026
User avatar
36041
admiral
admiral
Posts: 162
Joined: Fri Aug 20, 2004 4:57 am
Contact:

Re: Hull Extensions

Post by 36041 »

Hey Sandy,

Unfortunately, we are sitting in the rain in the remnants of TS Fay in north Orlando. The only lobster I've seen in 8 weeks are the ones at the local Publix store. I tried to go in their the other day with my spear and my swim fins, but for some reason they wouldn't let me in the back room where the sea food lives.

My engineer, Eric, said it was no problem to post the stuff from our napkin sessions, so as soon as I get it cleaned up in a digital format, I'll post it here or on our website, or where ever. We did some cost estimation and while it is very (VERY) rough and basic, we came up with about 120 hours of work and roughly $1500 in supplies and this included the paint required to match the new additions to the existing gel-coat. Depending on how much work you do yourself the price is probably not too far off your 15k.

As for the swim platform, etc, the design we came up with was pretty much a straight rip-off from what Manta did when they made the Manta 40 a Manta 42. It isn't quite the same style as the Seawind folks went for when they extended the entire external hull camber curve down to a new point 2 feet behind the boat.

Truthfully, I think the Manta approach makes a little more sense in that you get a nice open swim platform while still raising the trailing edge up out of the water with a much cleaner exit. You also avoid the problem that some Seawind owners have reported after they did the extensions modification in that you don't risk a safety issue with a following sea dumping lots of water (and weight) inside a built up transom extension.

Anyhow, Amy and I are going back to the Bahamas and the DR this year, but I think next summer we are going to return to Annapolis and take at least an entire year down to see family and such, so we are seriously considering taking a look at extending our 36 and making it a 38.

Tom
36041
www.tendervittles.net
User avatar
Page 83
admiral
admiral
Posts: 455
Joined: Sat May 08, 2004 11:48 pm
Location: Annapolis, Md. 36026

Re: Hull Extensions

Post by Page 83 »

Great! I'd love to see you, er, well Amy at least! I know these fabricators who have done some resin infusion....
Sandy Daugherty "Page 83" PDQ 36026
User avatar
PDQ-Dave
skipper
skipper
Posts: 68
Joined: Sun Mar 09, 2008 8:52 pm
Contact:

Re: Hull Extensions

Post by PDQ-Dave »

I've started a blog to document this hull extension project as well as other more technical items not suitable for my normal sailing adventures blog http://www.sailpacifica.com

The address for the Hull Extension Blog is http://www.pdq36.blogspot.com
Dave Kane
Previous owner of Pacifica #36068
http://www.DKsail.com
http://www.PDQ36.blogspot.com
User avatar
Page 83
admiral
admiral
Posts: 455
Joined: Sat May 08, 2004 11:48 pm
Location: Annapolis, Md. 36026

Re: Hull Extensions

Post by Page 83 »

If the bottom step is level it will accumulate some amount of standing water. I noticed that the Seawind extensions were slightly sloped aft, and had peripheral channels to promote dry footing.

There will be times when the extension will have to support at least a quarter of the total displacement: one or both transoms could ride up over a floating dock or a seawall that's awash. Will you be reinforcing the extensions with stringers or webs?

If you are having trouble getting the boat absolutely level on stands, I would suggest you raise it with disposable paper dunnage bags that can be inflated with a tire pump. Check out the "Heavy Weight Disposable Inflatable Dunnage Air Bags (D.I.D. Bags) at http://itwshippers.com/Heavy-Weight-Air-Bags.aspx

For grins, I would build a few 2'x4'x4' plywood boxes filled with pourable foam to support the bags. They would be useful work surfaces afterwards, or just another water toy.
Sandy Daugherty "Page 83" PDQ 36026
User avatar
PDQ-Dave
skipper
skipper
Posts: 68
Joined: Sun Mar 09, 2008 8:52 pm
Contact:

Re: Hull Extensions

Post by PDQ-Dave »

We have the boat nice and level and resting securely on jack stands and keel blocking. For future progress reports and more on the Hull Extension project see: http://www.PDQ36.blogspot.com

At the completion of the hull extension I plan to compile the entire project in to a more cohesive summary. In the meantime I'm just trying to get thoughts and pictures down on my blog to try to capture all the relevant thoughts and pictures.
Dave Kane
Previous owner of Pacifica #36068
http://www.DKsail.com
http://www.PDQ36.blogspot.com
User avatar
PDQ-Dave
skipper
skipper
Posts: 68
Joined: Sun Mar 09, 2008 8:52 pm
Contact:

Re: Hull Extensions

Post by PDQ-Dave »

The project has begun.
Dave Kane
Previous owner of Pacifica #36068
http://www.DKsail.com
http://www.PDQ36.blogspot.com
Post Reply