Posted 07 March 2012 - 11:50 PM
Today's weather was beautiful, just what I needed for moving the Penobscot 17 from my tent into the workshop.
The door lifts upward with a winch. I have barely enough room to squeak the boat through the doorway, so I didn't want the doors opening sideways.
Posted 07 March 2012 - 11:55 PM
Next we backed the trailer into the workshop, and used the gantry crane to lift the boat off the trailer.
Posted 08 March 2012 - 12:01 AM
Posted 08 March 2012 - 12:07 AM
Among the tools in use so far: carbide scraper, several knives, 1" chisel, impact driver, deadblow hammer, renovator's bar. Oh, and the ubiquitous safety glasses, which I'm always wearing in the workshop.
Posted 08 March 2012 - 10:16 PM
Don't mind the inverted sawhorses -- I haven't moved to Australia. I just rotated the photos to make them easier to see. The boat's still upside-down.
I'm also in the process of removing the deadwood, which is loose. Much of the epoxy between the keel and deadwood came out quite easily. The majority of the screws holding it in place were stainless steel. Except, of course, the last two in the stern flotation chamber, which are a bear to get at. They're plated steel, so they rusted. The aft-most one has a hex head, which has sunk partially into the keel, so I can't get a socket onto it. The other one, for extra flavour, has a square head .
Fortunately, plated steel screws have one redeeming quality: they're ferrous, so they attract magnets. A stack of rare-earth magnets worked like a charm to locate them, so I can surgically remove them from outside, without turning the entire deadwood into swiss cheese.
Posted 09 March 2012 - 03:49 PM
The crane was a DIY project too. I bought the design from http://www.synthx.com , and welded it up myself. It's come in very handy for many projects!
In boat progress, I just ordered replacement plywood for the deck, seats, and parts of most of the bulkheads. That should all be here in a week or two. In choosing between "big box crappy plywood" and marine plywood, I decided to split the difference and go with Baltic Birch. Epoxy-coated and painted, it'll be a huge improvement from some of the uncoated (!) marine ply I just removed.
The added incentive for Baltic Birch is that I can get it locally (5-minute drive) vs. half an hour (nearest big box store) or 3 hours (Noah's, in Toronto).
Posted 12 March 2012 - 01:23 PM
A closeup of the centreboard case. It appears the planking is loose from the case, which is why I'll be removing the case and reinstalling it with fresh wood.
How I removed the athwartship seats (front seat pictured). Using a jigsaw, I removed the middle section of the seat. A renovator's bar (fancy crowbar with a large bearing surface) was used to break the bond with the bulkhead. Then I clamped a block of wood to the edge, and used a hammer to knock it loose from the stringers.
In this photo you can see why it was easy to remove. The blobs of epoxy on the lower stringer (1x1) are smooth -- they made no contact with the seat whatsoever. There was also little contact with the 1x2 stringer above.
Posted 12 March 2012 - 01:30 PM
Cleanup of the interior progressed rapidly this weekend, when I moved up to using an angle grinder for stripping paint . This made it much easier to see the condition of the stringers. It also covered my entire workshop in dust!
At the bow, the uppermost stringer fell apart when I touched it -- surprising, given its location.
Posted 12 March 2012 - 01:44 PM
The builder added this assembly of 2x2 lumber to the bow, presumably to help support the main mast. The distance from the mast step to the deck is about 14". This framework extends that height to 21". I'm wondering if it's necessary? Also, if it is, would I be better served by installing the new deck at the level of the sheer, and extending the bulkhead upwards to meet it?
Next, the two mast steps are installed with a mortise on the step, and a tenon on the mast heel. I don't have the plans, but this strikes me as a bit odd, as it would allow water to sit in the mortise. Should I change this around to have a mortise in the mast, and a tenon at the step? Alternatively, a drain hole in the base of the mast step would allow any water to drain into the bilge. Thoughts?
Posted 15 March 2012 - 09:52 PM
I placed an aluminum beam in the corner of the knee at bulkhead #2 and #6. These aren't the names used in the plans, but they serve my purpose of identifying them in the boat. #1 is at the bow flotation chamber, and they increase in number going aft. At each bulkhead, I took photos of a tape measure placed in the corner. What I didn't picture here is the other 200 photos I took of other measurements.
Posted 15 March 2012 - 10:00 PM
The first half of the centreboard trunk was also removed. The discolouration shows the level to which water was standing inside the hull. The epoxy coating on the inside face of the wood is gone -- from water migrating through the wood.
With the centreboard trunk removed, the remains of the keel at bulkhead 2 is visible. Probed with a chisel, this wood offered as much resistance as a slice of bread. Yikes.
Posted 15 March 2012 - 10:03 PM
Posted 15 March 2012 - 10:11 PM
The knee, held in its usual location:
The aft face of the knee: shiny epoxy. There was no bond with the transom.
The mounting face on the inwale. The abraded parts are where the jigsaw cut through the epoxy. The dirty parts are where there was no bond.
The mounting face on the transom. This appears to be weathered varnish. The one screw was the only connection between the knee and the transom.
Posted 15 March 2012 - 10:23 PM
I then carved out the worst of the keel rot, and set about replacing it with new wood, which will be further glassed in place with biax.
The challenge was to reach the bottom of the hull, without turning it over. With two bulkheads (and a bunch of stringers) missing right now, I did not want to turn over the boat. The solution was a couple of axle stands under the cradle .
A length of rope around the lower casters works admirably as a wheel chock:
New wood, being held in place with shop weights while I trace the outline from below:
Two blocks of wood span the opening, held by a C clamp to keep the two halves of the planking aligned during this process:
The wood was shaped using my various woodworking tools (mitre saw, handheld planer, etc). I have a large-format CNC router, but sometimes it's quicker to just do it by hand -- especially when trying to fit to an existing, irregular part.
Here is the new piece of the keel glued and screwed in place. The screws are necessary to clamp it, as I don't have a C clamp big enough to fit around the boat . They will come out after the glue dries, and the holes will be plugged. The red marks are for alignment.
Posted 19 March 2012 - 07:36 AM
ROMANS 8:1, BELHAVEN 19, SPINDRIFT 12S, 10N, PENOBSCOT 14,
IN OVER MY HEAD CANDICE 28
Posted 19 March 2012 - 07:52 AM
ROMANS 8:1, BELHAVEN 19, SPINDRIFT 12S, 10N, PENOBSCOT 14,
IN OVER MY HEAD CANDICE 28
Posted 19 March 2012 - 07:54 AM
Lapwing #20 under construction
Spindrift 9N #521 - many KudzuCraft SoF kayaks
Posted 19 March 2012 - 03:46 PM
Believe me, I've been scratching my head wondering about many of the builder's decisions. I'll give you one example. On page 20, the plans state "To ensure that the stringers do not trap water, it is important to provide limber holes." This was underlined in red by the builder. A diagram is included on the next page, similarly annotated in red by the builder.
Now, how many limber holes do you thing were installed in the stringers? If you guessed zero, you're correct . Why did he omit them? I Don't Know.
As I'm starting into the reassembly stage (first epoxy applied this afternoon), I've come up with a directive to guide my decisions. If it's more work to fix this one than to build a new boat from scratch, then I'll not bother. For example, this is why the interior will be completely painted. It would be more work to partially re-plank this vessel to allow a bright finish, than to build a new one.
She'll be a nice boat when I'm done, but "Bristol Condition" is permanently out of reach for this particular vessel.
Posted 20 March 2012 - 08:28 PM
I coated the inside of the centre section of the hull with S1 Sealer, and then further strengthened both sides of the keel, and various parts of the plywood, with fibreglass. Most of the glass I pre-cut as biaxial, and laid it out on some pink foam before mixing epoxy.
A self-healing cutting mat and cutting wheel work great on fibreglass, without distorting the weave.
Here's what it looked like after epoxy coating and fibreglass. I used 10 fl oz of S1 Sealer and 20 fl oz of EAST System epoxy.
With this stage complete, the boat was lifted onto the trailer again, to spend a few days back in the tent (to help the epoxy cure) while I work on other, paying, projects.
Also tagged with one or more of these keywords: penobscot lapstrake, rebuild
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users