Sunday, March 29, 2015

Applying sail numbers - what worked, what didn't...

This weekend I checked off one of the most venerable items from my to-do list - applying the sail numbers to my Neil Pryde sail.  I think I've had this on the list for about a year, and decided to check it off.

The actual numbers are decals made of a lightweight cloth, and came with the sail.  The numbers all came as '8', so the first step was to cut them down to the needed digits.  I did that and carefully rounded the cut corners to to give a finished look.

The numbers are to be centered below the lantern logo, so I drew a vertical line through that. The numbers are 2" below the logo, and with a 2" separation between them.  Nothing is square to the edges of the sail, or to the seams between the sail panels.

Note that the numbers on the two sides of the sail are not at the same height, so when light is shining through the sail they don't obscure each other.  The number on the port side is placed lower, and full details are at this link: SCAMP sail number placement

I taped down a couple corners so they didn't move around on me.

And then put a sheet of contact paper over the whole works.  My plan was to then hinge the numbers up and remove the sticky backing, putting them back right in place.  This was a fiasco, as the contact paper didn't stick very well to the numbers and things were getting out of whack from the first.  Luckily we had only part of the '3' stuck down and were able to peel that back and start over. 

 Here's the technique that ended up working pretty well.  After putting the numbers in the right place, I stuck them down with a strip of masking table along one edge.

Then using the tape as a hinge, lifted the decal.

And started removing the paper backing. 

Then started pressed the number on to the sail while peeling away more of the backing.

Continuing along until it was all stuck down.  Wrinkles are the enemy here, so go slow.  A second set of hands is very helpful.

I then went over the decals with a laminate roller, and also went over every bit with firm pressure from my thumb.

And the result is good.  The thin fabric of the decal conforms to every wrinkle in the sail.  Now this will be all ready to go when we're ready to splash the boat.

Sunday, March 22, 2015

DIY No-cost Hiking Stick Clip

One of the items that has been outstanding on my list of things to complete for some time is to fit some kind of clip to secure the hiking stick on the tiller when it's not being used.

I looked around online for something that would work, and even ordered some nylon clips from Duckworks, but they didn't end up working, as they were too small and too stiff.  Might use them for something else sometime.

So today I implemented an idea I had a while ago to make my own clip. A few years ago I used rubber strips cut from the tread of a worn out implement tire to pad the steel crosspieces on a canoe trailer.  

I thought that some simlar material might work here, so drew a pattern on one of the left over sidewalls and cut it out on the bandsaw.  This is cut from above the bead area, but where the rubber is still pretty thick. Note that this type of tire has no steel belts in it.

I was able to smooth the edges with the disc sander, and then I drilled a hole to secure it with a #10 x 1" stainless screw. Tightening down the screw pulls it into the rubber nicely.  My countersink was of no use in the rubber.

I think it turned out pretty nice.  It has just the right amount of tension in it, and should last indefinitely.  Plus, I like making something out of nothing.

What do you think? A eco-friendly way to recycle an old tire into a good-looking and useful product?  Or an ugly monstrosity that would never be seen on your boat?

Sunday, March 15, 2015

Mast support blocks cut and fit

With my mast rounded and epoxy coated I decided to complete the parts needed to actually hold it in the boat.  SCAMP is similar to other small sailboats in that the mast is secured in two spots, at the base and somewhat further up.  This design has a mast trunk, a box that the mast fits in  (see this post: <mast-trunk-installed>), so two blocks need to be made that fit the mast and the trunk, and hold the mast tipped aft at a 2 1/2 degree angle.

I used a scrap of pine cut from a lumberyard 2x6 to make the upper block. Rather than attempting to tilt the drill press head to exactly 2.5 degrees, I instead left it vertical and made a ramp to hold the wood at the correct angle.

This was a good chance to drag out the old high-school trigonometry to calculate some dimensions. I could figure the length of the ramp needed assuming I would put a 3/4" shim under the end of it.

As it happened, I took my 3/4" shim and first jointed one face of it at 2.5 degrees, so the height ended up about 5/8" rather than 3/4".  Not a problem, I just recalcuated the position based on the lower height and glued the shim in place.

I then added a fence, clamped the ramp to the drill press, and clamped my stock to the fence.  I didn't want the 3" hole saw to grab and fling things around.  I drilled until the pilot bit cleared the other side, clearing the sawdust frequently, and then flipped the stock over and completed the cut from the other side.

I did a test fit on the mast and things were pretty close.  However, it would be very difficult and messy to epoxy the block on if it had to slide over the end of the mast, so I cut it in two pieces, and enlarged the opening as needed to make up for the saw kerf until I had a nice fit.  I then trimmed the block to width and length and epoxied it on, using a level to make sure it was aligned with the square block on the base of the mast.

Note that when cutting the block to length another session of trig came in handy to figure out how far off center the hole needed to end up.  Turns out they need to be between 1-1/4" and 1-3/8" offset.

Next I made the block that holds the base of the mast.  Since I glued in a square block at the base of my mast, I needed to make a block with a square hole, angled at 2 1/2 degrees.  I have about another half page of sketches figuring out the correct dimensions to make this up from four pieces of wood as shown below.

OK, five pieces.  I was not thinking clearly at one point and cut off my blank in the wrong place, so the hole wasn't where it belonged.  Rather than starting over, I decided to trim the far end and add a piece on the near end to move the hole over.

The center portion of this lower block is made of 2x material, which ends up not thick enough to hold the mast plug off the bottom once the taper is cut.  That's why the side runners are deeper.  This has the side benefit of providing space underneath for water drainage and ventilation.

I epoxied the pieces together and then cut the top at a 2 1/2 degree angle and rounded all the edges.  2 1/2 degrees doesn't sound like much, but as you can see it's quite noticable.  Over the 16 foot length of the mast it tips the top back over 8 inches.

Here's the lower mast step ready for a coat of epoxy.  This piece will remain in the boat when the mast is removed, while the upper block is epoxied to the mast and is removed with the mast.  I coated the inside of the step and the square block with graphite thickened epoxy to make them slide together easily. 

I won't be able to see how easily the mast inserts until I have the boat out where there's no ceiling overhead, but I think this will work well.

SCAMP gets a nose job (solving a problem with a custom router jig)

To the extent I can in my small shop, I like to take a step back from time to time and admire my progress.  Generally I am well pleased, but recently something a bit out of line caught my eye.

I think this had been hiding until the contrasting paint showed up the unevenness in the trim piece I had installed at the top of the bow transom last September (see this post: <rubrails>). My intent was to have the bottom of the trim match the curve of the deck, but looks like that didn't work out:

I thought about this for a while wondering how I could most easily correct the problem.  My planes would not work on this concave surface.  A curved sanding block beveled to match the edge angle could work, but that seemed like a lot of work and not guaranteed of success.

I finally hit on the idea of making a custom router base to which I could attach a fence curved to fit the deck, and a leg to hold the bit at the correct angle.

Here's a shot where you can see how this fits against the bow of the boat.  The bit is 1/2 inch diameter, and set to the correct depth will give me a nice radius at the bottom - I won't even need to re-fillet this joint.

Here's a first pass on one side, showing the amount of material that needed to be removed.

And here's the final result before painting.  I feel good about getting this evened up.  Clicking on any of these photos should show you a larger view.

Sunday, March 1, 2015

Mast and spars - final sanding and shaping

With the mast fairly round after my work with the hand plane, I continued with the final sanding.  I used a power sander to knock down the worst of the ridges, but my hand could still feel edges, so I then worked it over a couple times with a long strip of sandpaper, which could wrap around and did a good job of taking off the high spots.  It's pretty round now, and I've judged it good enough. Here's a shot of the base:

This is what a scarf joint looks like in one of the staves.

I then took my shinto rasp to the top end for a rough shaping.

And then finished up with 80-grit sandpaper over a foam sanding block.  80-grit is the finest I've used anywhere on the boat.

I then spent some time figuring out where the sail would lay on the spars, so I could determine where to drill the holes to hold the ends of the sail to the boom and the yard.  This took a while on the boom, as I also was figuring out where the eye straps and cheek blocks would go that handle the reefing lines.  I built my boom 6" longer than the plans, and ended up cutting two inches off.

I then rounded off the ends of the boom and yard, and drilled holes to lash the ends of the sail in place.  I coated the inside of the holes with epoxy.

I also rounded off the edges on the base of the mast,

And applied a layer of fiberglass to the plug for wear resistance, as this will be inserted into the mast step with each voyage.

At the same time I filled in some small voids in a couple places on the mast.  These were caused when I had a bit of a glitch routing out the V-grooves. The stave rode up and the router bit cut a little closer to the edge in a couple spots.  I didn't have quite enough epoxy spread in the joint to fill this on initial glue up.

So I brushed in a little unthickened epoxy, which flowed in to fill them completely.

When the epoxy cures I will sand things smooth, run a fillet around the plug in the bottom of the mast, and then coat the mast and spars with epoxy.  As of now I plan to paint the boom and the yard and varnish the mast to show off the wood.

Here's a sneak peak of the start to an upcoming project - I found this one really nice 16' long cedar 2x6 in the rack at Menards.  Nice tight grain and very few knots.  I'm planning to use this to build my yuloh - a Chinese sculling oar that I will use to move the boat when the wind dies.  I'll have more information on that to come.