The Greenland kayak is one of dozens of different Arctic kayak designs that uses skin on frame technology. In skin on frame technology you build a lightweight frame by pegging and lashing together pieces of wood and then covering the frame with a skin. The result is a boat that is light and yet strong.
Total time to build a Greenland boat the first time around is about 100 hours. That doesn't count time spent buying or collecting materials.
This instructible is fairly long so I've broken it up into a number of sections.Besides this intro, there will be the following sections.
Preparing the gunwales
Building the deck
Adding the keelson, stem and stern
Adding the ribs
Adding the hull and deck stringers
Sewing on & painting the skin
Skin on frame building is fairly easy and does not require either fancy tools or great wood-working skills. Skin on frame boat builders in the Arctic were hunters first and boatbuilders second. Everybody built their own boat. There were no professional boat builders and so the technology was at a level that was accessible to everyone.
And for pictures of more Greenland kayaks in action go to the qajaqusa website.
Step 1: Skin on frame technology is adaptable
But you aren't limited to original skin on frame designs for the boats you build. Pretty much any small boat design can be adapted to skin on frame construction. For instance, I built the canoe shown below using skin on frame construction. The originals of this type was an Ojibway birch bark canoe.
Or you can go small and ultralight and make yourself a 20 pound boat that you can hold up with one hand.
Step 2: Nomenclature
1. gunwales - pronounced gunnels. Gunwales are the two boards that form the outside edge of the deck.
1a. Risers - Triangular pieces of wood doweled to the ends of the gunwales to create more upsweep of the deck at the ends of the boat. See second picture at the bottom for an illustration.
2. keelson - This piece of wood runs down the center of the bottom of the hull. It is called a keelson because it is inside the skin. If it were outside of the skin it would be a keel.
3. hull stringers - also called chine stringers. These are long narrow pieces of wood that run parallel to the gunwales and halfway down the hull toward the keelson. Their job is to hold the skin off the ribs.
4. Rib - the ribs are the main structural elements of the hull. Their shape determines the shape and beahvior of the hull.
5. Stem board - A board that connects the keelson to the gunwales at the front of the boat.
5. Stern board - A board that connects the keelson to the gunwales at the back of the boat.
6. masik - this is the arched deck beam that supports the front of the cockpit. Some boats have a separate knee brace and masik and some boats combine both functions in one deck beam.
7. knee brace - the arched deck beam that falls right behind your knee caps and that you brace your knees against when paddling.
8. foot brace - the 4th deck beam from the front that you rest your feet against when paddling.
9. Back brace - the deck beam that you rest your lower back against. It also supports the back of the cockpit coaming.
10. deck beams - boards that run from gunwale to gunwale to keep the gunwales at the proper distance from each other.
14. deck stringers - pairs of narrow boards that span the space between deck beams in front and in back of the cockpit. They provide support for gear stowed on deck.
Deck lines - these are pieces of rope that cross the deck both in front and in back of the cockpit and allow you to store gear on the deck of the kayak.
Step 3: Tools
I have illustrated some of the less common tools below.
You will need two saw horses to build your boat on. Folding ones are easier to store, but you can make your own out of two by fours.
Your tape measure should be at least 20 foot long. Though the common length seems to be 25 foot.
You will need this tool for marking right angles. The edge of the flat bar is also handy for drawing straight lines.
Drill and bits
You will be drilling a fair number of holes. A battery operated drill is handy but an electric drill with a cord will work along with an extension cord to let you reach all parts of the boat. You can also use a hand drill if you can find one.
You will need the following drill bits.
1/4 inch for drilling rib mortises if you are not using a router.
15/64 inch for drilling doweling holes for 1/4 inch dowels.
19/64 inch for drilling doweling holes for 5/16 inch dowels.
You will need a claw hammer to pound dowels into holes and to pull nails used to temporarily hold boat parts together. A light weight hammer with a 12 or 16 oz head is fine. You do not need a heavy carpenter's framing hammer for your boat.
A block plane is used to smooth the edges of boards and also to round edges and shape pieces of wood. This small short plane can be used with one hand while the other hand holds on to the piece of wood. Bigger planes require two hands and are not nearly as useful
Spoke shaves are handy for quickly rounding the sharp edges of boards. The are also useful for shaping curved deck beams.
Some 2 inch spring clamps are handy for temporarily holding parts together. You can mail order these for about a dollar a piece. Two bar clamps with a 12 inch opening are handy for clamping stuff to your sawhorses so it doesn't move around while you are sawing or drilling on it.
You will need a knife for cutting string and dowels. It should be a knife with a fixed blade. If it is a folding knife, the blade should lock. Folding knives without a blade lock are dangerous since they want to fold up on your fingers while you are using them.
You will need a hand saw to trim pieces of wood to length
Table saw or circular saw
You will need one of those for cutting wider boards into narrower boards. Table saws are fairly expensive and if you don't have one, don't buy one just to build one kayak. You should be able to find someone to do the cutting for you. If nothing else, check with your local high school. They usually have wood shops set up and might want to help you.
A circular saw is much cheaper than a table saw and can be used to do the same cuts as a table saw. This is a dangerous tool. If you've never used one before get someone to show you how to use it safely. If it gets jammed, it kicks back and is liable to wound you. Find out about kickback and avoid it.
A rip saw is a hand saw that is used to do long cuts along the length of a board. You can do everything you would do with a circular saw though more slowly and with less noise. They also take some practice before you can make straight cuts, but they don't require electricity.
This is a pretty handy tool and can be used for cutting curved shapes such as your kayak bending form or the curved deck beams.
You will need a straight and a curved needle for sewing on the skin. Curved needles are the same kind as used for upholstery. The straight needles are about 3 inches long and have a fairly large eye for heavy thread.