Friday, August 15, 2014

July, 2014

The Deck   ...continued from June

Prior to fitting the deck pieces, I coated the undersides with 3 layers of epoxy resin. Once fitted it would be extremely difficult to crawl under and apply the resin. Good call out and timely reminder by fellow Merlin sailor and builder Jeremy Deacon.

Later, I lightly sanded all surface areas to be glued.  

A day later, I mixed West System epoxy resin with West System 206 slow hardener, added colloidal Silica and applied over the deck frame only where the forward piece goes.

Once over the deck frame, I aligned the forward deck to its final position and clamped it in place. 
To ensure a flat and tight bond against the deck frame, I added several wood pieces to weight down the deck against the deck frame.

You really can't have enough clamps...


This cedar beam was used to hold down the forward deck over the king plank.


A day later, after the forward deck was fitted, I removed the clamps and weights on the forward deck and setup to fit the starboard and port forward side decks. Before applying the epoxy I tested the fitting of these pieces, especially where they join the forward deck.

To help align the edges on these plywood joints, I added a 1 inch wide strip of  4 mm plywood under the outer edges of the forward deck. Gluing only a half inch under the forward deck side, thus leaving a half inch lip to receive the forward side deck.

View of the starboard front deck piece after fitting.


View of the port side forward deck piece after fitting.


One day after the forward side decks were fitted, I setup to fit the starboard and port side decks. Again, proper pressure applied to the plywood to attain a tight joint.


Starboard deck view from the rear. Clamping at the transom was done relatively easy by placing a sacrificial strip of plywood on top of the deck and clamping against the plank landings below. The clamp pads have rubber covers to prevent damaging the wood.

Same process was followed on the port side. View from the port side deck from the transom.

Here too, proper pressure applied to the plywood to attain a tight joint.


Lastly, I cut a 40 mm wide strip to fit over the transom between the port and starboard deck pieces. I cut it just a millimeter longer and snapped it tightly in place with a healthy amount of epoxy resin and colloidal silica. 

This view shows how I clamped this piece over the transom.




The deck pieces had an extra half inch of material for margin of error at each side. I started to shave the excess off but it was going too slow. I decided to try my router on the outer edges of the deck. For this, I used a carbide tip trim bit.
Because of the gunwhales' angle, this special router bit with a bearing only trims the edge of the deck down to 2 mm from the gunwhale's upper edge. 
I used this same router bit to trim the excess plank material at the transom so I knew what to expect. Nevertheless, I was extremely careful not to go too fast so the bit could do its job.

Very glad I used the router trim bit. It took me less than 1 hour to trim the inside and outside edges of the deck.



After routing the excess wood, I sanded down the edges of the decks flush with the gunwhales using 80 grit sandpaper.



View of the aft deck and around the transom. The finish is really smooth and a great base for rubbing strakes and carlins.



Very little is left to sand after the trimming the edges with the router. 


Front view after fitting the decks.


For the chute opening I planned to make a 1 piece cap made of solid Mahogany. I placed the Mahogany stock over the chute area and traced the shape. Then added a half inch to the outer edges for margin of error and then cut the trapezoid shape piece.


I applied epoxy resin with colloidal silica to the deck frame, placed the cap on top and placed a little bit of downward pressure to ensure a tight fit.

The next day. I used the plunge router to make a hole at the center of the chute opening. Then, I ran the router with the trim bit to cut the opening. Well, big mistake.

As I routed the opening, wood shavings were falling down the chute. At some point while I was cutting the chute opening, the router bit got really hot and ignited the wood shavings that were falling. I ended up with a couple of embers on top of the wood shavings over the bow tank.

Fire in the hull!
Smoke started to come out of the chute opening. Fire images flashed through my mind as I grabbed a bottle of water next to me and dumped its contents down the chute opening. 

Needles to say the cap was damaged and I had to remove it. Using a sharp chisel, I proceeded to chip away the old cap. 

Plan B was to use single pieces made from solid Mahogany stock.


Here's the finished cap. I still need to add a rounded Mahogany edge in front of the breasthook and round the corner of the chute opening to guide a smoother spinnaker launch.
 

And here she is today, ready for her rubbing strakes and carlins.




Naming The Boat

Perhaps one of the hardest things to do has been to figure a proper name for her. Not to be taken lightly, I believe the name must reflect a bit of the boat's character and personality, its ancestry and its destiny. So, after careful consideration and thinking Neptune and Aeolus will approve, I've decided to give her a Spanish name that means:
  • Naughty
  • Impish
  • Cheeky
  • Wicked
  • Astute
I therefore name her...

PĂ­cara


Monday, June 30, 2014

June, 2014

Painting The Inside

After applying two coats of Interlux Epoxy PrimeKote 2-part primer, I lightly sanded and cleaned the hull as prescribed, and applied the first coat of white Interlux Perfection 2-part polyurethane high gloss topside paint.

I followed the recommended roll and tip technique using a West System foam roller and a badger brush.


About 48 hours later, I lightly sanded and cleaned the inside of the hull in preparation for the second coat. For the second coat, I added Interlux's Flattening Agent for 2-part polyurethanes.

Mixing 2-part paint with thinner and then with 2-part flattening agent requires different part ratios and a specific mixing sequence to obtain the desired result per Interlux's instructions. I created a spreadsheet to calculate the combined ratios to mix only the amount of paint I needed.

View of the hull after the second coat was applied.


Finishing The Deck Frame

In preparation for the deck, I had to build up the deck frames to ensure the top surface of the deck frame is leveled with the sheerline. This work included building up the king plank, the breasthook and the deck beams.

My mistake was not to interpret the drawings correctly when I fitted the deck beams, the breast hook and the king plank, although the drawings were clear. 




Western Red Cedar strips added over the deck beams... 
...and 30 mm x 4 mm marine plywood over the spaceframe tops.

Western Red Cedar added over the king plank and the breasthook, shaved and sanded.
View of the added Western Red Cedar over the main foredeck beam...

View of the added Western Red Cedar over the forward foredeck beam and king plank after shaving and sanding.

Next, I cut two 6 mm plywood pieces to fit between the jib cleat and the aft deck beam on the starboard side. I glued both pieces together with epoxy resin and colloidal silica. Then, I shaved the starboard plank angle and fitted the 12 mm plate with more epoxy resin and colloidal silica. The same process was followed on the port side.

This doubler is for the main and lower shroud sheaves.

I decided to add more curves to the deck to smooth our her lines around the aft deck beam where it intersects the king plank and where it turns around towards the jib cleat.

I cut a couple of 48" long x  30 mm wide strips of 4 mm thick plywood. I made the cut across the grain to facilitate the bending of the plywood around the desired turn radius. The width, from a point in the rear deck beam, was reduced to 25 mm at the king plank. One piece was enough to go around from the king plank to the aft deck beam and to then to the jib cleat.

For the rear, I cut a couple of 24" long x  20 mm wide strips of 4 mm thick plywood. I also made the cut across the grain for these to facilitate the bending of the plywood around the desired turn radius.

Next, I added Western Red Cedar reinforcements behind the plywood bends between the king plank and the aft deck beam. Also behind the bend between the aft deck beam and the stringers reinforcing the carlin. 
Likewise in the rear, behind the plywood bend between the stringer and the transom

The Deck

Varnish will cover the deck around the boat so I made sure to select a couple of 4 mm sheets of marine plywood with a pretty wood pattern to show off. This is the one I selected for the foredeck.

Firstly, I measured the distance between the aft end of the king post and the forward edge of the breasthook where the deck will end. I added 1 inch to that dimension and cut the plywood sheet across. Secondly, I centered the sheet of plywood along the king plank leaving half an inch extra aft and forwards so I can then plane it to shape after it has been glued in place.

Jeremy Deacon, fellow Merlin Rocket sailor and builder, recommends this procedure. This way not only does one have a slight margin for error but one gets a really good straight join when doing the gunwhales. Jeremy has also done several top-notch boat restorations. Thank you, Jeremy!

Once over the deck, I secured the foredeck with clamps and using a pencil I traced the outer edge of the gunwhale underneath. Then I moved the foredeck to a temporary work bench protected with poly to avoid damaging the face of the plywood that will be exposed. I traced parallel lines to the gunwhale lines, half an inch apart for cutting the foredeck with an extra margin for error.

Using a power jigsaw, I cut along the lines. Then I placed the foredeck back on the deck frames, centered and secured with small clamps. Next, I traced the curves  under the foredeck from the aft deck beam to the king plank. Later I added parallel line half an inch apart for error margin before cutting.

View of the new foredeck from above. I'll follow a similar deck pattern as done on Rob Holroyd's WICKED. Two triangular pieces left from cutting the foredeck will be squared off and used to cut the adjacent pieces to the foredeck that will go half way down over the doubler for the main and lower shroud sheaves.


Next, I cut the second 4' x 8' sheet of 4 mm marine plywood in half along its length, ending with two 2' x 8' pieces. One for each of the side decks.

Later, I clamped the two 2' x 8' pieces over the side deck and over the transom. 


For tracing the outer gunwhales on both side decks, I followed the same process as with the foredeck, then adding a parallel line about half an inch apart for error margin.

Same process with the inner carlin lines except some careful foot work and balancing inside the hull was needed to trace the pencil lines.


View of the foredeck, the side deck and the deck piece between the foredeck and the side deck that was made from the plywood triangular pieces left from cutting the foredeck.


Aft view of the side deck turning around towards and over the transom. A narrow 25mm plywood strip was cut and placed over the transom, connecting both side decks.



All deck pieces in place before epoxy coating and fitting.


Looks like she's already smiling and just waiting for makeup!

Saturday, May 31, 2014

May, 2014

Sanding The Inside 

Sanding is a tedious but necessary step. It's messy and it takes a long time to go through the entire surface. Every plank, rounded edge, filet and pass-through hole was sanded using 220 grit sanding paper, one section at a time.


I didn't like the way the single centerboard cap looked so I added another 6mm layer of marine plywood with rounded edges and 6mm shorter all around to give it a stepped look.


I also fitted the hardwood floor stringers to provide surface for the jib sheet tracks. The stringers are 20" long, 1-1/2" tall and 1" wide. 

View of the two step centerboard cap and the jib sheet track stringers.


Another view of the two step centerboard cap and the jib sheet track stringers.


It took a long time to sand the inside but the finish will reflect the effort and it will be worth it.

Priming The Inside


Next, I applied the first coat of Interlux two-part PrimeKote primer. Priming the inside is more demanding than the outside. For one, there are many inside angles to cover. 








Filleting the joints with the round edge end of the filleting tool definitely was a big help as I applied the primer with a 1/4" radius roller. 




I also used a 1-1/2" badger badge to cover around the floor strengtheners the tight angles.



Before applying the second coat of Interlux PrimeKote primer I fitted the two cleat platforms for the main sheet hoop controls over the thwart. Made from the same hardwood stock as the one I used for the crew floor stringers, I  glued the cleats to the thwart using epoxy resin mixed with with colloidal silica.

The precise location for the cleats and all other interior parts can be found in the Interior Construction and Layout drawing from designer Keith Callaghan.


Lastly, I fitted a hardwood mounting block for the mainsheet swivel jammer.


Next, I applied the second coat of Interlux PrimeKote primer. It was just as challenging as the first one.  


Aft view after priming.


Having applied only the first coat of primer to the foils, I proceeded to apply the second coat of primer to the rudder...

...and to the centerboard.


Thank you for visiting!

Fair winds and happy sailing!