Friday, June 21, 2013

Fabric slot top cover for Creamcheese

Slot top cover for a Michalak AF3
For our spring cruise this year, I made a slot top cover to keep the rain out of the cabin while sailing.  The project made me learn about new fasteners and new techniques.

Materials:
As usual, Sailrite videos helped a lot.  In particular I learned how to make the boot top by copying from a  mainsail cover.

Mast boot

Finished product

Installation details
With the cover on, it is difficult to get into the cabin.  I think my next project will to make a new version  which is more like a dodger.  It will be fitted around a fiberglass hoop and have a vinyl window forward so that someone can sit up in the cabin and see forward.
Future project - a dodger



Wednesday, May 29, 2013

A mooring cover for The Drascombe, Tenara thread

Mooring cover for our Drascombe Longboat
Having met with some success in my new hobby of canvasworking, I decided to give my father the Christmas gift of a new mooring cover for his Drascombe Longboat.  Since the cover will be out in the brutal Florida sun most of the year, I chose Tenara thread, which is made of teflon.  My other projects have used v69 polyester thread which is strong and resists UV light more than most threads, but it still degrades over time and can loose up to half of its strength after a year in the sun.  Tenara on the other hand doesn't degrade at all.

Materials:

Tenara is so slippery that both my sewing machine and my mother's couldn't get the top thread  tension tight enough.


I spent hours trying to figure out how to increase the top thread tension and finally got fairly repeatable results by putting the thread under a gum eraser that was rubber banded to the sewing arm.

Extra friction mechanism:
rubber band and gum eraser

Mama's sewing machine

My sewing machine, spool holder - prevents twist

Corner fasteners
Design features:
  • laced front panels
  • webbing reinforced spine
  • two 1/4" fiberglass hoops
At the slip

The cover is a success.  It keeps the rain in the scuppers where it belongs and protects the mizzen sail, mainsail and other cockpit items from sun and rain.

Sunday, May 5, 2013

2013 Spring Cruise - Smith Island

Safely moored in front of the Inn
Our kids were away the first week in April so we took the opportunity to go sailing around Smith Island in the Chesapeake bay.  As the date approached and we realized the night time temperatures were going to be in the low 30's, we decided it would be too cold to camp on the boat, so I started looking around for hotels or B&Bs.  After a few web searches and reviews on Trip Advisor, I spoke with Linda and Rob at the Inn of Silent Music.  They weren't yet fully ready for the season, but they graciously agreed to open early for us.  We promised to be low maintenance guests.

We put in at the MD public boat ramp in Crisfield, MD.  The ramp is next to the coast guard station, but also in a not-great part of town, so we parked the car at Somers Cove Marina in Crisfield, MD.  The staff were friendly and helpful.

Inn of Silent Music
Creamcheese at low tide
The winds were variable, temperatures in the mid 50's.  A storm front was due over the area in the evening and we hoped to make it the 10 miles to Smith Island before the storms hit.  It was a nice sail, and we didn't quite make it to the Inn before the black clouds came over.  Luckily all we got hit with was a light shower and an exciting broad reach under a double reefed main sail.  As we tied up to the dock, we were greeted by our hosts Linda and Rob, who helped us unload our gear and get settled.  After a hot shower, we went downstairs for a glass of wine and a delicious dinner.  When I had made our travel arrangements, I signed up for one dinner without any particular expectations.  Julie and I were  unprepared for how fantastic it was.  Linda is a great cook.

Our stay at the Inn of Silent Music was quite different from the camping adventure that we had originally envisioned - a delightful surprise.  I highly recommend this inn to small boat cruisers.

On the second day the temperatures were in the high thirties and low fourties, so we explored the tiny town of Tylerton and lounged around.  We spoke with a few watermen working on their boats and met Beau, a golden retriever who likes to walk around with a ball in his mouth for playing fetch.  Beau was temporarily living with Danny while his owner was away.  Danny talked to us about crab pots, oyster rigs and his 30' deadrise skiff.  This boat has a tunnel drive that allows it to travel in as little as 16" of water.  Powered by a 150 hp John Deere gasoline engine, it can cruise at 17 mph.

Amanda Lynn, a Deadrise Skiff with a tunnel hull
We learned a few local terms too.  For instance, the garboard (a plank close to the keel of a plank and frame wooden hull) is also referred to as the garbageboard, probably because it requires the most maintenance.  The deck of a deadrise skiff is called the ceiling.  Danny has a flock of about 20 ducks that he has raised from hatchlings.  They are free to go whenever they want, and can fly as well as the other wild ducks that they hang around with, but they never leave.  They will fly across the harbor but as soon as they get to the edge, they will plop down into the water as if they had hit an invisible wall.

Town dock at Tylerton, MD on Smith Island

Danny's work shed, with oyster rake, crab pots and a few
of his ducks 
In the afternoon, I took the boat out to try out the reefs in 20-25 kt winds (see previous post).   After a leisurely sail around the town, I returned to the dock under sail, tied everything up, walked 30' to the inn and joined Julie, Rob and Linda for another evening of great food and good company.

On our third day, we decided to sail to some of the other parts of Smith Island.  After a yummy breakfast, we geared up (temperatures still in the 40's) and beat upwind through the narrow channel that leads from Tylerton to Ewell on the northern part of Smith Island.  Tylerton is a town of maybe 60 families.  Ewell seems to be about twice the size.  

We tied up near the town dock at the restaurant that was still closed for the off season.  The town had a different feel than Tylerton but was a nice place to walk on a sunny, chilly day.  From Ewell, we walked the one and a half mile road through the marsh to the town of Rhodes Point.  A trash fire from the town dump had jumped the road and was burning in the marshes.

Marshes, marsh fire
While walking around Rhodes point we talked to a woman whose family had stayed with their home during Hurricane Sandy.  The water had risen three feet above her front lawn, with waves crashing onto her front door.  She said she didn't plan to do that again. 

We stopped for a while to help a church group from Mechanicsville, VA that was cleaning up the washed up debris from Sandy.  They come every year to help and this year there was plenty to do, even though the hurricane had hit over six months previously.

Rhodes Point, MD

On our way back to the boat we passed a house with a chesapeake gunning skiff (sometimes called gunning punt) sitting in the middle of the front yard.   Notice the big yoke on the thwart - it is for mounting a big punt gun.  These guns were essentially seven foot long portable cannons that could be loaded with enough birdshot to kill hundreds of ducks or geese in one shot.
Gunning Skiff in Front Yard

The hull shape of this boat is very similar to the Louisiana pirogue of my youth with the exception that there is almost no rocker in the gunning skiff, whereas the pirogue that I had when I was 13 had about 4" rocker over a length of 12'.  Smith Island is a lot like where I grew up in the Cajun country of south Louisiana.  The geography is very similar and the types of fishing are virtually identical.   There is the same pragmatic, self reliance and independence.  

  
Tied up in front of the Inn

We had a lovely broad reach back to Tylerton and yet another evening of good food and conversation.  The next morning we got up early and after a "light" breakfast, we sailed back to Chrisfield and home.

A "light" breakfast

Back at Crisfield, MD

Sunday, April 7, 2013

Third reef sailing report

After our spring cruise in the Core Sound last year, I decided to sew a third reef into our sail.  I finished the improvements in the fall but didn't get to test it out until our 2013 spring cruise last week at Smith Island in the Chesapeake bay.  I had been unsure whether the third reef would be worth the effort and now I have answers to my questions.
Tied up after an afternoon sail

The third reef was awesome!  

It was sunny, cold and windy, with northerly winds from 15 kt to 25 kt, sometimes gusting to 30 kt and daytime temperatures in the 40's.  We were able to comfortably sail upwind with no gymnastics on the windward rail.  The new mainsheet also worked out well and while my hands are a bit raw from working in the cold, the cam cleats and heavy nap of the rope were a joy to use.  We met a few watermen while staying on Smith Island (more about that later) who were surprised to hear that we were going out in such weather.

Q: Too little sail?
A: It was just right.  We were able to tack upwind during the worst of the gusts.  The forecast during the first test of the third reef was 15kt to 20 kt gusting to 25.  Our average hull speed was 3 mph with bursts to 3.5.  Creamcheese's best upwind speed is a little over 4 mph.  I estimate she pointed about 50 to 55 degrees off the wind.  Her best upwind performance is 45 degrees, but she is always faster at 50 degrees.

Sailing upwind
(taken during a lull)
Q: Lee helm?
A: Happily, there was no upwind lee helm but instead the perfect amount of weather helm - about the same as with the full mainsail.  I don't understand how moving the centroid of the sail 19" forward can have no effect but I listed my hopeful explanations in my original post about sail math.  Another possibility is that even though the sail centroid moves forward, the center of effort is very close to the mainmast and so doesn't move very far.  And because the sail lacing gets slack (see picture), the luff of the sail is actually about four inches from the mainmast, thus moving the center of effort four inches aft.




First sail with three reefs tied in (taken during a lull)

Saturday, November 10, 2012

AF3 Cockpit Tent

Fitted tent for camping
We used a polytarp for a recent trip to the Core Sound of North Carolina's outer banks and it served its purpose well.  

Polytarp cockpit tent for AF3 Cream Cheese
It kept the rain out during a 35-45 mph storm one night and sheltered us from the wind when it was in the 50's Fahrenheit.  But the tent takes a lot of time to setup, is noisy, ugly and bulky.  Running the lines under the hull is awkward.

Having achieved some sewing success with my third reef project, I decided to embark on another sewing project; a custom fitted camping tent.

Planing
I spent a few spare evenings reading through my copy of "The Complete Canvasworker's Guide" by Jim Grant.  Then I made a few line drawings of various designs including various configurations of hoops and frames.  I finally settled on a simple A-frame design slung over the sprit boom and bimini similar to what we had used in North Carolina:



Cockpit tent design - side view
Cockpit tent design - top view
Materials
Use gravity  
This project required many 10' to 12' flat felled seams.  At first I tried put the sewing machine and fabric on the floor but I quickly found out that my Janome Magnolia 7300 sewing machine doesn't have the power to pull all of that fabric.  I solved this problem by following the advice of of Emiliano Marino's "The Sailmaker's Apprentice" and constructing a gravity feed system.

Sewing long seams using a gravity feed system
Sailrite's 3/8" basting tape
I made the first seams using pins.  The results were crude and tended to have puckers.  Later in the project I ordered a roll of 3/8" Seamstick basting tape.  What a difference it made.  My seams were more uniform and took far less time.

Walking foot
Also halfway through the project, I ordered a walking foot attachment for my sewing machine.  It also makes for more uniform seams.

No boom needed
I sewed 1" polyester webbing along the centerline and terminated each end with 2" webbing and a 2" bronze ring.

Ridge reinforcement
This allows me to stretch the tent taught between the bow and stern and eliminates the need to use the sprit boom as a ridge pole.  I clip the mainsheet to the stern ring and pull it taught.

Attachments
I used stainless rings and webbing to attach the cover to the boat.  I found sailrite's how-to videos to be very helpful in figuring out the mechanics of assembly.
Corner Attachments
Ready for assembly
Attachments and Setup
I sewed in sleeves for fiberglass tent hoops but after experimenting with the fully assembled tent, I decided that the hoops added almost nothing and complicated the setup.  The sides of the tent clip to lashing hooks fastened underneath the gun'nle.

Side attachments
The bow uses a single pole with a line tied to the forward mooring cleat.

Bow detail
The stern is open to the air, .  The corners are tied to the stern mooring cleats.

Stern detail

Next steps
I am very pleased with the results.  The tent only takes about 6 minutes to setup.  I will probably sew in a few windows and I may fabricate a panel to cover the stern.



Sunday, September 30, 2012

Leeboard repair - the "rope trick"

Dry fitting for the "rope trick"
I damaged the leeboard on Cream Cheese last year by driving away from the launch ramp with the board dragging in the gravel.  I discovered my error after about 50 yards, but by that time I had chewed off about 3/4" inch off of the bottom corner of the leading edge.  Later on Grahame Byrnes, designer of the Core Sound series, told me about "the rope trick".  The idea is to glue an epoxy saturated synthetic rope (usually nylon) to the leading edge of the board, thus providing a well shaped but very durable surface.  Here's an example from the Core Sound 20, Dawn Patrol:

Rope on the rudder of the Core Sound 20, Dawn Patrol.
It protects the leading edge of underwater boards

I decided to try the rope trick myself.  First I cut away the damaged wood and fitted the rope.

Fitting the rope
Then I soaked the rope in epoxy and draped fiberglass cloth over it and let it partially cure (8 hours over a cool night).  I made a mistake at this point in the process.  I should have used thickened epoxy to fill the spaces between the rope and the board but I didn't.  As a result, there are air pockets.  Hopefully this won't be a major issue since the boat is dry sailed and all surfaces are thoroughly coated with epoxy.

Fiberglassing rope in place

Then I filled using epoxy thickened with fused silica and microballoons and let it cure.

Filling and smoothing

I made a first pass at sanding and smoothing and filled some more with thickened epoxy.

Final sanding before painting

Saturday, September 22, 2012

Mainsheet for AF3 - third try is a charm

New nylon webbing reef nettles.


I've always resisted getting "yacht" grade hardware for my little plywood boat, but I've learned that sometimes the expensive stuff makes your boat far more seaworthy than the cheap stuff.

For twelve years, I sailed Cream Cheese with the simple mainsheet arrangement shown on the plans.

original
Then in March, I modified the rig to bring the sheet forward.

modified
We sailed last weekend in gusty conditions (5 to 15 mph) and I was still unsatisfied with the mainsheet.  It suffered from a number of problems:
1. The line was too thin - 1/4" line is not comfortable to hold when it is really windy
2. Mainsheet was tied to a combination block/jam cleat forward.  This holds the mainsheet too firmly.  It was too difficult to release during gusts.
3. The mainsheet gets in the way when you are coming about.
4. Running the mainsheet through a block on the base of tiller creates an awkward weather helm.

So I looked at the mizzen for the Core Sound 20, which has about the same sail area and the same position in the stern.

Core Sound 20 mizzen sheet

It has three important features:
1. 3/8" line.  Easier to handle in strong winds, lays better in the cockpit.
2. Standup blocks on either side of the tiller - no extra forces on the tiller.
3. Cam cleats - super easy to set or release.  Much safer in gusts.

So I went to defender.com and bought some expensive hardware and 50' of low stretch line.
I tried out the new mainsheet arrangement today with more gusty winds.  Wow- what a difference.  Even Julie, who is doesn't usually like sailing in gusts, was very comfortable at the helm.

New main sheet - I'll fix that twist later.