Shimmin' O' The Chines

It sounds like it could be the title of an Irish folk ballad... "Shimmin' O' The Chines." As many ballads go, the actual work has so far been a mixture of hope and tragedy.

Well, perhaps "tragedy" might be a bit of an overstatement. But, what was that I said in the last post? "Two steps forward, one step back?"

In any case, I'd made the shims by cutting a 14-inch piece of mahogany in half with a hand saw. Then I planed each half down to approximately 3/16" with a planer/jointer. I epoxied these into position along the low point in the port chine.

When I was planing down the overhanging edge, however, I wasn't paying enough attention to the angle at which I was holding my larger hand plane. Before I knew it, I'd inadvertently gouged the side planking. There's not much I can do about that now, other than fill the gouge in with epoxy. I guess it's a good thing I wasn't planning on a bright finish for the sides.
 

Mahogany shims for filling in that low spot along the port chine.

The overhanging edge faired away quickly, but you've gotta watch the angle on those larger hand planes.

A close-up of the gouge in the plywood.

All the bottom planking is fitted. However...

All the bottom planking is finally fitted.

Two steps forward and one step back. Technically, that is still progress. That’s also the current situation with the Utility as I try to finish up the bottom planking.

In a nutshell, the panels are all fitted, but there is a little more fairing work to be done. Back in March, I mentioned in a post that there appeared to be a low spot on the port chine. With the planking on, I can see that this problem is compounded by a second one: there is also a high point on frame #1.

These two photos show the "hook," or low spot in the planking caused by a high point on frame #1 and a low spot in the chine.

So, what needs to be done now?

I’ll have to remove the panels, and sand down that high point on the frame. I’ll also have to add some more wood to the chine to build up the low area. Then the panels can go back on to re-check the fitting.

Aside from that issue, there has been other progress. I cut away part of the sole support on the transom to make room for a drain tube. I have not decided yet for certain if I will add a drain tube or not. However, if I do, part of the sole support would need to be removed. That is much more easily done before the bottom planking is attached permanently. I cut away a section 1-3/4" wide, next to the port transom knee. That should allow enough room to install a 1" drain tube. A coping saw and a couple of chisels handled the job nicely.

1-3/4" of the sole support on the transom cut away to make room for a drain tube.

 

Bottom port forward is dry-fit.

On Father's Day, I finally completed dry-fitting the bottom planking on the forward port side of the boat. I'm very happy about that.

Port bottom planking, dry-fit with screws and washers.

The fitting started off wonderfully at the aft end, where the planking joins along the centerline of the keel. By the time I finished at the bow, however, there were some spots where the fitting was not as good as I'd hoped. These spots can be filled with thickened epoxy, of course. Still, I wish the fitting had been better.

About midway along the keel, there is an open seam approximately 18 inches long, and about 5/32" at its widest point. There was also supposed to have been a transition joint just forward of the end of the keel. I did not pre-plan for this, and as a result, I kind of messed it up a little bit. 

5/32" gap along the centerline of the keel.

The missed transition joint.

In retrospect, I think both of these mistakes could have been avoided if I had overlapped the planking along the centerline of the keel, and trimmed the whole length to fit as I went.

There is another small gap between the bottom planking and the side planking at the stem. 

Another small gap up forward.

My plan is to use epoxy thickened with mahogany sawdust (ie: Wood Flour) when I glue this panel on. From what I've encountered so far, this mixture seems to absorb impact better than epoxy thickened with #2 silica (which seems more brittle). The thickened mixture will fill in these gaps, and I believe that in the end it will all be just fine.

Completion of starboard bottom.

June is upon us once again. I have now been working on my Glen-L Utility for just over two years. A good two years it’s been, too. The little boat and I have both come a long way, in many regards.

I’ve just completed planking the full length of the starboard bottom. It’s neat to think that a year ago, I was installing the sheers.

I should be able to start dry-fitting the forward port bottom this week. My goal is to have the boat fully-planked by the end of the month.

As always, time will tell...

This is what the boat looked like 1 year ago. The sheers had just been installed, and fairing had not yet begun.

Initial fitting of the butt blocks.

Butt blocks dry-fit with screws.

Butt blocks epoxied, screwed & clamped into place. Putty knife at the ready.

Epoxy squeeze-out like this will create a fitting nightmare if you let it cure this way.

That's what the putty knife is for. Scrape it away before it cures.

Aft section battens & butt blocks drilled & ready-to-go.

Aft panel drilled & ready-to-go.

Starboard bottom, fully planked.

Look at the bright side. It could’ve been worse.

The first bottom planking panel is on. 1 down, 3 to go. That is the good news, and that is the main point.

Getting there, however, didn’t go quite as smoothly as I’d hoped.

It was a Sunday night, and the pre-fitted panel was off of the boat. Before it got too late, I figured I’d go ahead and glue it down. After all, I would really like to get this boat in the water this year.

One small step was in the way: I still needed to finish encapsulating 3 limbers on frame #1. That takes a different type of epoxy than the stuff needed for gluing. No problem. I had 3 mixing containers.

Ominous foreshadowing #1: Not wanting to waste time, I’d only cleaned two of the three mixing cups.

The encapsulation part went fine. Just a few ounces of System 3 SilverTip. Quick and easy. On to mixing the GelMagic epoxy for gluing.

That went fine, too. That is, until I spread the last of it onto the final remaining inches of the boat frame, realizing as I did so that I had no epoxy left to spread onto the plywood.

Best practice is to coat both mating surfaces. Best practice is to use a clean mixing cup for each batch of epoxy. Now, I had one cup with still-curing SilverTip, one cup I didn’t bother to clean, and the last cup which I had just used.

Since the epoxy on the boat would start kicking off at any minute, I had to make a split-second decision: Either mix more GelMagic in one of the dirty cups, or hope what I’d put on the framework was enough on its own. With best practice being to coat both surfaces, I hurriedly scraped out the GelMagic cup as best I could & hoped there wouldn’t be a problem mixing more in it.

I quickly poured in about the same amount of resin. (That is, as “quickly” as one can “pour” GelMagic.)

I calculated the amount of hardener needed, quickly grabbed the bottle, opened it & upturned it....

...which is when I quickly found out I’d added the wrong hardener. GelMagic hardener is amber in color, and very viscous. This stuff was clear and flowed like water. It was the SilverTip hardener, not the GelMagic, and now I’d just wasted both.

I calmly murmured a string of socially-acceptable phrases, and pondered my next move.

I had more epoxy, but the last remaining mixing cup was full of junk. It still had hardened clumps of SilverTip thickened with mahogany sawdust clinging tenaciously to its inner walls. There was no time to clean it.

So, I made another rush decision & decided to use it. The clumps started breaking free as I mixed the batch of GelMagic. I picked them out as best I could as I spread the epoxy onto the plywood. That in itself added more time to an already urgent task.

It takes a long time to hand-drive 97 screws. It takes longer when you’re having to bend plywood against its will in the process. It took long enough, in fact, that by the time I drove the last screw into place the epoxy was so viscous I could barely manage scraping it with the putty knife. It was also late by this point. I was tired and exhausted.

I was so tired, in fact, that I forgot something very important. I forgot to reach underneath the planking and scrape away epoxy along the battens, where I will need to fit the butt blocks for joining the planking panels. Ugh...

Chipping away at THAT for the last 3 days has been fun, I assure you.

Oh well. The first bottom panel is on, and it is on solidly. That is the good news, and that is the main point.  

With the forward panel removed, this is how I marked the lines to cut butt blocks from a scrap of plywood.

The Utility's framework & the Zip's stem assembly.

First bottom panel epoxied on.

Fitting at the stem.

Transition joint.

My daughter's Hello Kitty mirror was a huge help in chipping away at that epoxy.

The Zip takes one step closer to reality

Last night, I assembled the breasthook and stem assembly for my Glen-L Zip. From my previous experience of having built stems and breasthooks for two other boats, I decided to use a different technique this time.

In the past, I would assemble the two pieces of the breasthook and let the epoxy cure. Then, later on, I would attach the completed breasthook to the stem. This time, I assembled all three pieces together at the same time, using only one batch of epoxy.

The reason for doing it this way was to avoid having to deal with the bead of hardened epoxy that forms along seams where the epoxy is squeezed out from between two parts. I’ve learned that it’s a good idea to scrape away any squeezed-out epoxy before it cures by using a small, flexible putty knife. Still, if a bead of hardened epoxy forms on an inside corner, (such as in the notch of the breasthook), it can be difficult to remove. It can also cause problems when you’re fitting pieces together.

By putting all three pieces together at the same time, this problem is easily avoided. 

I decided to assemble the breasthook and stem with the same batch of SilverTip epoxy that I was using to encapsulate limbers and underside parts on the Utility. Not much epoxy was required for this small bit of encapsulation. I had a small amount of #2 silica ready to add to the remaining epoxy when I was done. The Zip parts were disassembled and staged, ready and waiting for the epoxy.

Limbers & underside parts of the Utility needed to be encapsulated before I attach the bottom planking. I won't be able to reach these places once the planking is on.

All the Zip parts set to go: stem, mixing cup for epoxy, kitchen scale in a freezer bag, chip brush, screwdriver, putty knife, awl, small container for #2 silica, mixing stick, rag, and both parts of the breasthook.

After encapsulating some small areas on the Utility, I mixed the silica with the remaining epoxy to thicken it for gluing. I spread this mixture on both mating surfaces of the breasthook and on the top of the stem as well. I used an awl to quickly align the holes on the two parts of the breasthook, and screwed them back together. Then, I fitted the breasthook onto the stem, pressed it down firmly, and used two 2.5-pound weights to hold it down into position. Then I scraped away all the epoxy squeeze-out with the putty knife.

The Zip's stem

Stem and breasthook assembled, waiting for the epoxy to cure. These parts are all made from 3/4" marine-grade Douglas Fir plywood.

Completion of dry-fitting starboard bottom.

With the first forward panel dry-fit, and the Raptor staples sanded off the transom, the next tasks ahead of me were:

1. Decide how to finish the transom.


2. Fit one of the aft panels.


3. Drill & screw the remaining holes in the forward panel.

I had originally planned to stain the transom before fiberglassing it. This is mainly because I felt that Meranti had too much of a dull brown look to it. I wanted the bright finish to have a good bit of red. I was having a hard time finding the right type of stain to do what I wanted. I was also beginning to get the idea that staining and finishing plywood is a bit different than staining and finishing solid stock. Another boatbuilder, with far more knowledge about woodworking than I have, convinced me to at least try a large sample swatch of epoxy over some un-stained Meranti to see what I thought. I did, and was happy enough with the result that I decided to abandon the idea of staining it first.

Un-stained Meranti with a layer of SilverTip epoxy.

Un-stained Meranti with a layer of SilverTip epoxy.

Next came fitting one of the aft bottom panels. Compared to the front, this was quick and easy. Since the aft end of the forward panel is so far back on the boat, the aft panels only needed to be 33 inches long. I cut 33 inches off of one of the full-size sheets of plywood, then cut that in half. I used the factory-cut straight edges to align the panel on the keel’s centerline and to butt up against the forward panel. It fit together very well & I started placing screws every 6 inches, just like the forward panel.

Aft starboard bottom panel fitted into position.

With both pieces fit, and the overhanging edges trimmed down considerably, I looked for any humps or hollows along the surface. Fortunately, I did not see any that I could discern with the naked eye. So, I decided not to shim the chine any on this side.

Thankfully, I did not see any visible humps or hollows on this side.

Lastly, I placed all the remaining screws in the forward panel. Now, there are screws located every 3 inches, so I will not have to worry about trying to do that at the same time as I epoxy the panel down permanently.

The next step will be to remove the forward panel and use it as a template to cut the forward port panel.