Archive for April, 2010

Toward Reconstruction

The biggest news is that we’ve turned the corner on the interior work and have begun rebuilding. With all of the old, nasty foam out and the interior sanded and bare, we were ready to replace the interior bulkheads.

Before we could place the forward bulkhead there was some work to take care of in the forepeak. At some point the old bow pulpit, which had been secured with toggle bolts, had been torn from the deck, ripping out significant portions of deck – core and all. Since the forward bulkhead would limit access, we had to adhere fiberglass cloth to the underside of the interior laminate prior to closing off the area. This layer of cloth will form the base of our deck when it comes time to re-core that area. Sorry, we didn’t get any pictures of the glass in place because our fingers were sticky. Here’s what we were dealing with:

Holes in the foredeck due to torn bow pulpit

Two forward bow pulpit holes in forepeak

Earlier in the week we visited Johnson’s Workbench in South Bend, Indiana, where we picked up two sheets of Hydro-Tek (Meranti) plywood certified to BS1088. That certification comes at a steep price – 113.00 per sheet of 3/4″ and 82.00 per sheet of 1/2″ – but the special “marine” glues and void-free construction will guarantee another thirty-some years of sailing for #1240.

We started work Friday by carefully constructing a template for the forward bulkhead out of cardboard scraps. We started with the upper-center portion, notching the top to fit the overhead contour, then taped a piece on either side and worked our way down until we’d filled the area. Our finished template wasn’t attractive, but it fit well.

Forward bulkhead template in place

We transferred the forward bulkhead template to our 1/2″ Meranti plywood and used a Sabre saw to cut it out.

Nick G. cuts out the forward bulkhead

Alex S. finishes the cut

A test fit confirmed that the bulkhead would fit well, so we mixed up some epoxy to coat the plywood’s edges and then set the bulkhead in place using thickened epoxy. It was at this point that we realized we should have had a plan for holding the bulkhead in place while the epoxy cured. Although the dry fit seemed to indicate that the bulkhead would stay put on its own, the epoxy allowed it to creep around, forcing us to improvise. After squaring the bulkhead (we’d already leveled the boat), we wedged some braces in place to keep things where they needed to be.

Tony models the new foward bulkhead

We exhausted what little epoxy we had by filleting the lower half of the bulkhead (and a little on top), so we’ll have to fill in the rest once we have new supplies. Our lack of epoxy also meant that we had to postpone tabbing the bulkhead to the hull.

Tony J., Nick G. and I turned our attention to the main bulkhead while the epoxy cured. We found a nice large scrap of cardboard in the shop and appropriated it for our next template. With Tony inside the cabin, Nick and I braced the outside of the cardboard while Tony bent and cut it to shape. There were some places where it took the hull contours well, but in other places it just wouldn’t cooperate. We decided at that point to modify our approach and use that template as a pre-template on which we would transfer the hull shape with the aid of a compass. We dragged one edge of the compass along the contour of the hull while the other end transferred that shape about two inches into our template. With that done, we removed the template, grabbed another large piece of cardboard, and transferred our hull contour onto the new piece. We cut the new template to size and conducted a trial fit. With a bit of trimming, it fit perfectly and is ready to be used to trace onto the 3/4″ plywood.

Tony poses with our pre-template template for the main bulkhead

With that done, we cleaned up the shop and called it a day, knocking off a bit early due to other commitments.

2010
04/23
POSTED BY
CATEGORY
Uncategorized
TAGS



1 comment

This and That

Today we spent some time as a class doing a few odd jobs. Some sanded. Some cleaned the rubrails. Some wiped the hull with solvent. Most of us worked.

Daniel R. sands

Constanza and Michael do their best to clean the rubrail

Klara solvent washes the hull prior to sanding

Matt and Josh solvent wash the hull too

Kaitlyn and Becky sand the tiller for refinishing

Alex sands trim pieces

Bonnie sands more wood

Port side of rudder blade partially coated with epoxy

2010
04/19
POSTED BY
CATEGORY
Uncategorized
TAGS


Leave a comment

Still grinding away at it

Today marked the conclusion of week three of the project, and things are moving along steadily.

The class spent some time in the shop during the week sanding, cleaning the spars, and scrubbing deck hardware, while others continued to chip/gouge/pry/slice the remaining pour-in foam out of the aft area of the boat. We ultimately decided to remove a small bulkhead at the aft end of the cockpit to gain access to the foam from under the deck. Additionally, we opened up a 12″x12″ hole in the aft deck to improve access, which made a significant difference. Tony, Michael R., Nick and Alex S. chipped away at it, and Tony finally finished the job today, pulling out chunks of foam occupied by a colony of large black ants.

Nick removes foam from the aft compartment

Opening up the hole in the aft deck confirmed what we already knew: the majority of the balsa core that strengthens the deck structure is soggy and rotten. That means it’s necessary to remove most of the top layer of fiberglass on the aft deck, scoop away the old balsa, and then re-glass the entire area, carefully fairing it before painting. I know there are at least two other areas of substantial core damage that will need to be addressed as well.

Michael D., Joey W. and Oliver S. completed the first step in preparing the topsides for sanding by transferring the bottom of the boot stripe (the horizontal red line at/near the waterline) 3″ lower. Doing so allows us to sand the topsides and boot stripe while maintaining a reference line that we can bring back up 3″ when the time comes to paint the new boot stripe.

Michael D. transfers the bootstripe

Matthew O. tackled the rudder repair Wednesday afternoon. Earlier, we had removed two of the three boards that comprise the rudder blade, leaving the primary board that attaches to the rudder post in place. The two pieces we removed had separated (if they were ever attached) from their surrounding joints, and a previous owner had attempted unsuccessfully to re-attach them with some kind of caulk. We removed the caulk and cleaned up the edges with a light sanding. Matthew O. wiped the mating surfaces with acetone while I mixed up some epoxy. We coated the raw edges in unthickened epoxy, then added thickener to the mix and bonded the pieces of rudder blade to each other, making sure that plenty of epoxy oozed out from the joints. We smoothed the excess and left the epoxy to set.

Matthew O. preps the rudder sections for epoxy.

The first rudder section is epoxied to the main portion of the blade

Today I sanded down the epoxy that had squeezed out of the joints, and gave the rudder a light sanding to prepare the surface for fairing with thickened epoxy. We used up our last little bit of hardener, so we had only enough epoxy to fill two holes in the blade, which allow access to threaded rods that support the blade, and give the top portion a coat of fairing compound. We’ll finish fairing next week when we have more materials. In the meantime, the rudder is looking good and inspires much more confidence than it did a few days ago.

Rudder with a thin coat of fairing epoxy (before we ran out of epoxy)

Rudder blade epoxied together and sanded

Once again, I donned the full-face respirator and climbed into the cabin to finish sanding the sides and overhead. Sadly, I’ve discovered that it’s much more difficult to hold a 6″ RO sander over my head for any length of time than it used to be just a few short years ago! The good news is that this portion of the job is nearly over. There is only a small patch (that I forgot) that needs sanding. When that’s done, we are officially ready to begin reconstructing the cabin interior. I’ll be happy to be into reconstruction, which should begin next Friday.

Nick and Alex S. spent much of the afternoon polishing the various pieces of deck hardware and rigging – winches, cleats, chainplates – and had a very shiny (and pretty) collection before too long. As Tony remarked, the boat will look like new when she’s finished.

Freshly polished hardware

We concluded the day’s work with a good cleaning of the boat and the shop. And then we did the most enjoyable thing of all…we spent half an hour sitting in the empty cockpit admiring our work and imagining the future. These are great kids.

2010
04/09
POSTED BY
CATEGORY
Uncategorized
TAGS




6 comments

Scratch and itch

I think that title may have been used in Don Casey’s “This Old Boat,” but it’s applicable to the work underway on the Ensign. We’ve been grinding, sanding, and grinding some more in preparation for interior reconstruction, and we’re nearly there.

Tony, Nick, Alex S., Bonnie, and Michael D. continued work Friday afternoon. Bonnie settled in with the RO sander and sanded part of the cockpit and bilge. When she’d had enough of the dust, she turned her attention to cleaning the deck hardware – i.e., winches, cleats, etc – in kerosene.

Tony, Nick and Alex cut out the rear bulkhead at the aft end of the cockpit and began removing some more pour-in foam. With limited access, that job is proving to be tough.

Michael D. sounded the decks and circled areas where the core is likely damaged. The starboard sidedeck from the winch base to the chainplates is soggy. The foredeck triangle from the stem fitting aft about 2-1/2 feet is soggy, and the aft deck is shot. We’ve got a fair amount of core replacement to take care of. Typical deck construction consists of a layer of end-grain balsa sandwiched between two layers of fiberglass: the upper skin, which forms the deck, and the lower skin, which forms the bottom of the deck and the interior of the cabin. Repair requires removing the top skin, scraping out all of the damaged (wet) balsa, cleaning the lower skin, then placing new balsa in a bed of epoxy before finally covering it with new fiberglass. Once that’s done, the surface will need to be faired, primed and painted. We’ll postpone deck work until we have the interior bulkheads reinstalled.

I spent some time sanding the interior of the cabin with the RO sander and 80 grit paper to prepare the surfaces for fiberglassing and, eventually, paint.

We ended the day by setting two of the cockpit floors (grate supports) in thickened epoxy. We’ll get an order in for marine-grade plywood and begin reconstructing the cabin on Friday, if all goes as planned.

2010
04/04
POSTED BY
CATEGORY
Uncategorized
TAGS




Leave a comment

Recent entry

Archive

Category