Coffin box build
 

thought some of you might be interested in this. Building a coffin box using temp molds. Box top and bottom are cored with honeycomb. Made a mold for outside skin and a male mold for inside skin. Next step is to fill with foam...

Using all epoxy. Box gets faired before prime/paint. Painting it to match the boat its going on.

https://lh3.googleusercontent.com/Px...=w1379-h775-no

https://lh3.googleusercontent.com/O6...=w1379-h775-no

https://lh3.googleusercontent.com/oG...r=w437-h775-no

https://lh3.googleusercontent.com/t6...9=w437-h775-no

https://lh3.googleusercontent.com/gG...=w1379-h775-no

What is that new hull design in the background?....interesting.

Do tell....I have seen coffin boxes but you don't see to many plank framed hulls that have that much dead rise and that type of bottom contour, Almost looks like a plank framed seacraft on a slightly different scale minus the steps. Most of these are flat in the back much more. Looks like this one is modeled to have a more constant rise after the entry all the way back. Very nice on the coffin box indeed but love to here more the hull too. Is that douglas fir strips or juniper or something else?

Think this is the build Shine announced a few months back. 25 ft or so...Think he mentioned that lines were inspired by SC but no vdh (although that may be a future design).
Nice CB. What was your thought in making the one and outer skins filled with foam (2 part expanding?) Vs building out of a foam core or even seen roofing insulation.

Nice and thanks for the build

The hull is a custom design for myself. 24 degree deeadrise, 25' (27 to end of brackt) Hull shape from chine down is similar to formula/seavee/whitewater/etc, but it has wider chines and a 6" keel pad. Shearline has a little dip towards the bow, but it similar to SC, and there is tumblehome at the transom. It unique, but of course the styling is inspired by some of my favorite lines.

Structurally, she is a composite sandwich hull. The strips/planks are a core, biaxial skins inside and out set in epoxy. Strips are mostly cedar, with fir on chines and keel.

The coffin box is coming along nicely, poured the foam yesterday, will pull all the molds apart Monday and start fairing.

out of the molds and trimmed, next is fairing and making the bottom piece.

https://lh3.googleusercontent.com/pb...=w1300-h732-no

https://lh3.googleusercontent.com/zd...=w1300-h732-no

looks good! Nice job.

Cool boat, When I first saw it I thought "that looks like an seacraft crossed with an Ray Hunt rear section with chines added but with out the VDH". Sounds like you took the best of several good designs and made them work together. I bet that will be an light weight good riding hull when finished. I always wanted to do a smaller 25-28' plank frame Carolina boat with a more of an deeper vee instead of the traditional flat back. Something with the broken sheer line and tumblehome. I don't think the smaller hulls do as well as the bigger hulls with the flat low dead rise in the rear. 24 degress should help the ride on that length hull and hopefully the chines take the roll out. Sounds like a cool build. Post some pics of it as you work on it as well if you don't mind...

Its going to be light compared to a glass hull of the same size.

My first drawings had a carolina style topsides with broken sheer and a little more tumblehome. More tumblehome decreased the cockpit width too much though. Form following function, what make a good traditional carolina hull, turns a "gimmicky" IMHO when you go to a 25 open boat. fine entry, flair, warped bottom ending in nearly flat deadrise is what makes a bigger carolina boat work.

It would be possible to modify this design to a VDH without too much trouble.

I have a ton of pictures, and I am keeping a build thread on other forums, just didnt think it was totally on topic for CSC forum, but I can post some pictures in an off topic thread.

rolled some prime on yesterday, using the EMC high build epoxy primer.....

http://www.gulfstreamcomposites.com/...mers-s/126.htm

http://i68.servimg.com/u/f68/19/19/83/70/20160216.jpg

http://i68.servimg.com/u/f68/19/19/83/70/20160217.jpg

at least one more application of fairing, then several more coats of primer. *Will be cutting hole for drain and holes for mounting bolts next.

can I steal the idea to use in my 20 MA... I plan to build a box to fit between my console and the step up..... this is bigger but scaled down with no curve... and the insulation is WAY above anything on the market !!!

I have seen some of the smaller Carolina boats built as scaled down versions of their bigger cousins but don't think the flat back on the bottom suits them well at that length. Your design should aid in those areas that better fit the smaller hulls. Not everything can be just scaled down and still work. I love the look of the broken sheer and exaggerated tumblehome but It makes since to keep the space more usable when you have the narrower beam. If you don't mind posting the pics, I would love to see them in a "off topic" thread

I would be happy if anything I have posted can be of use to you, in fact, thats really the whole point :)

Thanks for the coffin build and info on the boat build. Why did you go with a plank method vs foam core or cold mold (think you mentioned time and effort were a negative)?

Could you compare the 3 methods in terms of skill, cost, time, strength, weight?

Thank you!

posted a few renderings and specs .....

http://www.classicseacraft.com/commu...608#post241608

more primer, more fairing. *PVC epoxied into the bottom for the mounting bolts.

http://i68.servimg.com/u/f68/19/19/83/70/20160218.jpg

http://i68.servimg.com/u/f68/19/19/83/70/20160219.jpg

http://i68.servimg.com/u/f68/19/19/83/70/20160220.jpg

http://i68.servimg.com/u/f68/19/19/83/70/20160221.jpg

http://i68.servimg.com/u/f68/19/19/83/70/20160222.jpg

using the same hinges I used on the last coffin box, super heavy duty and rounded

http://i68.servimg.com/u/f68/19/19/83/70/20160223.jpg

Using EMC highbuild primer, it sure fills and builds fast !

link to the primer: http://www.gulfstreamcomposites.com/...mers-s/126.htm

Sheathed strip (composite sandwich with wood strip core) is easier (quicker less skill needed) and cheaper than foam strip. Its lighter and cheaper than cold molded, probably quicker too

I prefer a sandwich hull, this one gets a lot of glass. Outside skin actually will have just about the same glass schedule if it were a foam core boat.

Another coat of EMC highbuild primer, then today the first two coats of Matterhorn White on the inside of the box. *Picture shows only the first coat. *Second coat gave full coverage. * The guide coat is just some spray paint, it lets you see where you need to sand and keeps you (hopefully) from sanding through. *Actually, I did sand through in some spots on the inside, but the paint covered just fine. *Paint is rolled on (no tipping) with a cigar style roller. *I used no reducer and it laid out like glass.

http://i84.servimg.com/u/f84/19/19/83/70/20160210.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160211.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160212.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160213.jpg

That's coming out awesome ...

sanded outside of box to 220 grit. *Used my neighbors spray booth just to keep dust off, rolled a couple coats of EMC Quantum paint on in the booth. *Used about 1/2 quart so far and covered about 56 square feet with two coats. * *I need to put a coat on the boattom of the box, and I may put another coat on the inside of the box, but besides that I think the painting is done. *The guy I am building this for wanted a non-skid pattern on the top, so that will happen next week after I install the hardware and gasket

http://i84.servimg.com/u/f84/19/19/83/70/20160214.jpg

this picture was taken right after rolling the paint on, it is in the process of laying out.

http://i84.servimg.com/u/f84/19/19/83/70/20160215.jpg

This is after about 1 hour, all tightened up and dry to the touch. *

http://i84.servimg.com/u/f84/19/19/83/70/20160216.jpg

Looking good.

finished up. *Hardware mounted and a non-skid (kiwigrip) pattern on the lid.

http://i84.servimg.com/u/f84/19/19/83/70/20160230.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160231.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160232.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160233.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160234.jpg

wow thats beautiful. luv the pencil idea

wow really looks great. I would love to have one on my boat. don't understand the pencil shot?

Handy guide for the non skid tape.

Delivered the coffin box last week to Key West. *The color was a good match. *Bolted the box to the forward hatch, then we went fishing :) *Boat is a guide boat on stock island. Of the dozen of so charter boats at the marina, I think there were 7 conch 27's

http://i84.servimg.com/u/f84/19/19/83/70/20160310.jpg

http://i84.servimg.com/u/f84/19/19/83/70/20160311.jpg

Used it to scribe an offset line onto the tape

nice work hope you put some fish in that box

Was a slow afternoon, had a nice blackfin get sharked, burning that was is. Fortunately, on Monday I was on an overnight trip out of vero and we did ok on yellowfin blackfin and triple tail.

Your signature says your from vero !