A64 Tacking Outrigger

STYLISH CRUISING FOR TWO

 

A64 revised amas bow w

The A64 originally appeared as a design article on the pages of Duckworks Magazine back in 2006 (yeah, really!). When the boat was shown at the time, it was designed as a request from a friend of mine for he and his wife.

Since that time, I have revisited the design and taken a fresh look at the boat, its potential and the wide range of uses it might see while in use. There are more than a few revisions to the design in this iteration and I am very happy with the outcome.

Original Duckworks article here: http://www.duckworksmagazine.com/06/designs/a64/

While it would seem from outward appearances, that this boat would be a perfect fit with a modern rig like a Marconi, the truth is, I’ve been playing around with more traditional setups for the A64.  Even though the A64 is capable of some pretty quick sailing, I was looking for a bit less of a hotrod, while very much wanting versatility in rig setup and handling. The boat has had its displacement potential enhanced just a bit so that it could easily carry the gear for a well-equipped camping and cruising scenario. I see the boat being used for long, extended weekends on the water, so the extra capacity is a welcome change.

A64 SPECIFICATIONS:

LOA – 21’
BOA (vaka hull) – 31”
BOA (trailer width)  – 7’ 8”
BOA (complete boat)  – 9’ 10”
LWL  – 20’ 11”
BWL – 21.5″
Displacement  – 1160 lbs.
Prismatic Coefficient  – .56
Sail Area  – 103 sq. ft. up to 166 sq. ft. (skill dependent)
Weight  – 225 lbs.

Much of the inspiration for the A64 is due to the design of Joe Henry’s truly sweet, Flaquita tacking outrigger. I’d always liked the compact beauty and well thought-out utility of Flaquita and it has remained so, even after the new revisions. There are still a small collection of images of Flaquita on the Web if you are Google adept.

It’s no secret that designers have been pilfering each other’s design cues for as long as man has been building boats. Far from being offended by the process, I find that it’s the very essence of the pilfering that allows for new ideas to be incorporated. These incorporated changes, in turn, have the potential to improve the usefulness, the performance and the strength of the boats so that everyone benefits. 

Vaka Hull

A64 New 10-07 bow obl wThe revised vaka hull for the A64 is quite bit narrower than the initial design. It also draws more water with increased rocker. The initial boat was done to a very specific design brief that specified very thin water capability and a fairly short paddle length to the water. The new boat is basically a narrow hulled, multi-chined canoe form that is designed to optimize the displacement requirements while providing the least amount of wetted surface. The prismatic coefficient of a normal canoe hull has been changed to .56 to allow the boat to accelerate to speed comfortably and hold its speed with little effort. Paddling, while still comfortably possible, will probably be replaced by a small, 2 HP outboard engine… something like a Honda 2hp four stroke would be ideal. Close quarters maneuvering will likely be done with a paddle as paddles are truly effective when the movement space is tight.

I drew the boat to have a typical, multihull trampoline surface on the ama side of the vaka hull and a non-typical trampoline surface on the off side that was inspired by Flaquita. To form a mental picture of the tramp surface, picture one of those sling chairs you might have had when you were a young college dude. Simply, it’s a loose trampoline cloth slung from an outboard rail back to the hull gunnel with enough slack to provide a seat for the crew when they need to hike out. The rack is angled up to provide the backrest component of the seat as well as give water clearance when the boat is heeled to the offside. The tramp surfaces can be rolled-back away from the canoe hull gunnel to allow for traditional paddling. Take a look at the renderings to get the complete picture.

The vaka hull is decked to enclose the bow area back to the forward aka beam as well as the aft section behind the open crew compartment. A somewhat traditional cockpit rim is specified for the central opening so that the owners can install a large spray skirt covering. This rim will keep a lot of the wave wash out of the boat under sail and paddle, as well as increase structural integrity. The  fore and aft decked sections provide for watertight storage as well as flotation, should the boat be swamped or capsized. Additional flotation is provided by the single large ama, as well as the new, safety ama. This boat is not going to sink, should some major operator error get it upside down. You may lose any unattached belongings, but the boat will not sink (well, short of driving it on a reef at speed, holing all the flotation chambers)


Ama Design

A64 New 10-07 aft w

The redesigned ama reflects my current thinking for a stitch and glue built form of this type. I have increased the volume for more of a heeling resistance margin. The ama has also been reshaped to more efficiently shed water from the deck, should it become immersed completely while being driven hard. Where the previous ama had a large flat deck surface, the new one has angular shapes that bevel into a much narrower top deck. This will allow the ama to drive back to the surface and give a huge new margin of safety to the boat when sailed hard.

The form is still very full, as well as deep in the forward sections, putting the flotation where it is needed the most. The bottom profile of the ama tapers up and away from the water as it moves aft to maintain the least amount of wetted surface for the ama as it is pressed. The new ama is a high efficiency design with just under 100% displacement buoyancy of 1029 pounds when submerged to its deck. When coupled with the length of the aka beam, the ama volume represents a considerable amount of righting moment.

Most single outrigger designs will be parked with the canoe hull adjacent to another boat or dock. The generous ama buoyancy of the A64 allows it to be maneuvered so that the ama is right up alongside a dock and the crew can easily walk across the trampoline to go ashore. Two, full grown adults can stand on top of the ama and not come close to submerging the form.

As an alternate to this type of docking strategy, the off-side, safety ama, is hinged, allowing it to be swung up and over the vaka hull. This allows the boat to be drawn right up next to the dock for direct entry to the vaka hull.

Curved Aka Beams

There are two methods for building the aka beams. The simplest is to laminate 3mm (1/8″) hardwood strips on a form, glued together with epoxy. The builder then glasses the beam, fills the weave and varnishes to high gloss to reveal the beauty of the wood beneath.

If you wanted to go all-out, you could make an easily constructed, epoxy/glass, box beam structure. The leading edges of the box beam would be further shaped in foam to give the beam an aero/hydrodynamic form as presented to the wind and waves. The entire form is then glassed for a finished beam and then painted as desired.

The akas attach to the canoe hull with simple cinch buckle straps much like those used to tie-down boats to roof racks. I have found this system to be extremely dependable, economical and the straps are very simple to replace if one breaks or is misplaced.

If the A64 is trailered, the main ama remains mounted to the hull and the offside ama, which is hinged, swimgs up and over the vaka. Transport width for the boat in this configuration is just under 8’ and well within legal limits. This makes for an incredibly fast setup and take-down at the launch ramp. The only work involved is in stepping the rigs, mounting the rudder and attaching the offside hiking tramp.

The Rig

A64 New 10-07 raised w

The base design specifies a balanced Lug rigged yawl. The main mast will be rigged with a 70 sq. ft. sail and the mizzen will fill-out at 33 sq. ft. The balanced Lug provides simplicity in rigging and reefing and is surprisingly powerful, stows inside the hull with ease and could also be built quickly and economically in poly tarp, if the owner is so inclined and finances dictate.

 

Alternate Rig Solutions

 A64 Big Gunter wThe boat has also been drawn as a 131 sq. ft. Gunter yawl, if the desire for more performance is there. In fact, there are many rig configurations that could be run on this boat and I’d like to see builders experiment a bit to find the magic for their own adventures.

 

 

A64 Big Rig w Gennaker

For those who seek a bit more in their sailing adventures, I have also drawn the A64 with a 156 sq. ft. Marconi yawl rig. Along with this rig, there is an option for a 124 sq. ft. Gennaker flown from the forward mast. With the spinnaker flying, one could expect that this boat will be quite quick in favorable, offwind conditions, capable of covering a lot of distance in a short time.

The Foils

The vaka hull will be equipped with a leeboard that is mounted to the port side of the hull. It will rotate for shallow water and be of a planform and foil section that will provide the best balance of lift and minimized drag for the sailing speeds of the boat. Typically, I like my leeboards on boats of this type to be NACA 0009 sections.

Likewise, the rudder’s characteristics will match the needs of the boat’s performance and it will be able to flip-up when it contacts underwater obstacles, or is beached while down. I do this with a simple bungee on the leading edge of the rudder, well above the waterline. The bungee holds the rudder down with sufficient force to overcome water pressure while sailing, but it easily stretches, allowing the rudder to swing up and aft if the blade contacts anything more substantial. The rudder foil will be a NACA 0012 section, to maximize control and minimize stall for low speed maneuvering.

The A64 will be very easy to build, it will be very light weight for its size and, therefore, quite easily driven in even the lightest of winds. The boat will carry a sizeable load for a very long weekend on the water. I wouldn’t be surprised at all if a couple of adventure cruisers could pack enough stuff on board for an entire week away from a source of supply.

It can be sailed comfortably in the thinnest of water and if the wind dies, this boat can be effortlessly propelled with traditional paddles for reasonable distances… or the crew can simply fire-up the Honda and go wherever their gas tank allows them. Perhaps this isn’t a real big issue for a lot of cruising boaters, but the A64 will be capable of surprising speed under sail. That will be especially true if equipped with the larger sail rig.

Adaptable, Modular Design

As a last little bit, to put an element of curiosity into the design package, there is a very nice folding trimaran with a comfortable solo cabin that is derived from this same vaka hull design that I will introduce in the very near future called the A21.

Any and all comments, or questions, about this design or the upcoming A21 are encouraged.

CHRIS OSTLIND

LUNADA DESIGN

NAGARE 21′ AND 17′ MIRAGE DRIVE SPEEDSTERS

Making use of Mirage Drive propulsion with more efficient hulls designs

 

Nagare 21 Bow Obl w

Nagare  (nah-ga-ray) is a Japanese word meaning Flow.

The two boats in this group are 17 and 21 feet in length and are known simply as the Nagare 17 and the Nagare 21. Both designs make use of the popular Hobie Mirage drive for principal propulsion with the 21 footer Nagare 17 bow obl wbeing a double Mirage setup and the 17relying on a single Mirage.

Both of them are configured as trimarans with fairly small and unobtrusive amas designed to give the boats remarkable stability in a wide range of conditions while allowing the vaka, (main) hull to be decidely slender for more effective drive through the water.

The Nagare sisters also have incredibly narrow waterline beam numbers that, when coupled with their fairly long hulls provide for very easily driven hull forms for high efficiency per unit of energy applied.

I expect both boats to operate at the very high end of commercially available paddled boats of the same length, beam and weight. So, yes, they can go pretty quickly, but that’s not the real purpose.

The real benefit of the design genre is through the ease with which they are propelled at any given speed, compared to other boats of their size. This efficiency translates directly to those using the boats as less tiring for miles covered, or greater speed with the same effort as other, wider designs.

Because the propulsion is derived from the largest muscles in your body, the leg muscles, rather than the arms and shoulders, there will be less fatigue for each mile traveled. Because leg muscles are so much bigger than arms, they will be able to do more work in a given period of time, making for longer possible trips, as well as the mentioned lower fatigue issue. With a less fatiguing effort, more people will be able to enjoy the experience of being out on the water for daylong adventures.

NAGARE 21 DOUBLE
SPEED AND STABILITY FOR DOUBLE RECREATIONAL BOATERS

Nagare 21 Aft Obl w

The Nagare 21 uses a set of amas, mounted on a pair of simple, anodized aluminum tubes with quick release snap buttons holding the sections together for easy disassembly for car-topping. If a trailer is used to transport the boat, the beam of the Nagare 21 falls well below trailer maximums, so nothing special needs to be done to take the boat to and from the water. Two Nagare 21’s can be trailered, or car-topped, by removing one of the amas and placing the main hulls close to one another on the racks, or trailer. The removed amas easily fit inside the hulls and they are ready to go. The whole affair on the rooftop is very much like a pair of sea kayak doubles. Because of the length, I would not mount a boat this big on any compact cars. You would be very likely to rip the rack right off the roof in strong side winds.

Steering is by means of a simple, flip-up style kayak rudder with control lines run through the hull to a convenient steering lever in the cockpit. I suggest the SeaLine SmartTrak rudder system (do a search for supplier), the P-41 Multi-purpose rudder from Onno Paddles http://www.onnopaddles.com/onnocomponents.htmland the Feathercraft rudder system for hardshell boats. http://www.feathercraft.com/accessories/rudders-hardshell.php  These are really great rudder units and will give excellent steering control with minimum drag.

NAGARE 21 SOT OPTION

This boat can be built with a full cockpit tub so that it functions as a Sit-On-Top kayak with full drainage through the Mirage drive openings. Auxiliary drain ports are located in the tub for rapid removal of any water that comes in over the side of the hull. I suggest the SOT option for warm water users, with the more traditional kayak style, Sit-Inside hull form for those who will be using the boat in colder water, or more frequent inclement weather.

The SOT version has internal bulkheads for support of the SOT tub, along with the capability of adding a small circular deck plate for an additional watertight compartment in the cockpit that is perfect for small items, such as cameras, wallets, car keys, etc.

The SOT variation is an optional element to the base plans. If you wish to built it as an SOT, drop me an email at my regular email address and I’ll get back to you.

ROUGH WATER USE

This is not really a boat that is meant to go out in rougher conditions, such as those where a full-blown sea kayak might be right at home. It’s meant for quieter waters, such as lakes, bays, harbors and bigger rivers. It can take a session in 1 or 2 foot breaking surf, but I would not expose the boat to bigger waves, especially in a shore break scenario. You may find yourself out from the shore a bit when the wind comes up, producing steep, choppy waves. The basic Nagare 21 will handle this easily because only the cockpit will be exposed to swamping. The amas will keep the boat stable while you pedal to shore, or a quieter place on the water, where you can bail-out the boat and continue.

It is a perfect boat for sightseeing, bird watching, fishing, photography, and just simple, energy efficient cruising with near bomb-proof stability (you can stand up in the boat while out on the water without your partner coming completely unglued, for instance).

The Nagare 21 is a fast, comfortable and unique boat for a couple who like to get out on the water, but do not want to hassle with the business of capsize that is present in other types of boats, such as kayaks and even canoes.

NAGARE 17 SINGLE
A NEW STYLE OF SOLO BOAT FOR TROLLING FISHERMEN

The solo version of the Nagare series has some very different twists, compared to its bigger sister. It has the same, highly efficient and easily driven, slender hull technology, the same set of trimaran style amas well aft for big time stability, the same generous cockpit opening and the same convenient utility for car-topping or lightweight trailering.

The design elements that set this particular boat apart from its sister craft is that the Nagare 17 has a very special capability when it comes to fishing.

AFT FACING TROLLING

Anybody who builds the Nagare 17 and intends to use it for fishing will probably be knocked-out by the potential for facing aft while trolling. Imagine using your legs to quietly drive the boat forward while you casually set trolling rigs, eat a sandwich and keep an eye on the fish finder… all while keeping an eye on the rigs you have set, with them easily at hand?

Nagare 17 bow obl trolling mode w

This is the signature utility development with the Nagare 17, designed specifically, for fishermen. It works like this…

The fisherman loads his boat, drops into the forward facing seat, hits the iPod for his favorite tunes and jams out across the lake at a remarkable speed for a human powered boat. He zips across the lake in virtual silence because he’s driving a very skinny and efficient hull with no engine sounds. Once he arrives, he’s going to make a few sneaky trolling passes with his Mirage drive pushing him along over that monster crew of Pike that are hanging around on their favorite piece of structure. Wham! Fish On! and the day starts with smile on his face.

If you’ve ever fished from a typical Sit-On-Top, you know that you have to face forward while trying to look over your shoulder while trolling. Hook-up and then you have to swivel around, grab the rod and go after the fish. All the time you are doing this, you have to balance the boat carefully, because the whole tamale could go over and end your day right then and there.

Well, that’s how you used to do it, anyway.

With the Nagare 17, you can take it to a whole new level of fishing pleasure. The Nagare 17 is equipped with twin Mirage drive trunks. When driving the boat forward and facing forward, the Mirage drive is dropped into the forward trunk and a tractor-style seat is dropped into the aft trunk with the seat bottom resting on the top of the trunk.

To convert the boat to aft facing trolling and fishing, you simply stand up in the boat and swap the Mirage drive for the aft mounted seat plug and the seat then goes to the front trunk… facing aft. With the Mirage drive still set to drive the boat forward, you simply sit down and start pedaling, slowly, up to your desired trolling speed.

Now, you can watch your fish finder, GPS and your trolling rigs while you continue to tool along at your favorite speed for nabbing the fish. Get one on and simply work that rod while continuing to face aft. No twisting around in your seat, no ”just about dumped it” scenarios, just simple, fun fishing in a very stable boat. What could be cooler than that?

With the fore/aft balance point of the boat set right between the two drive trunks, there is but a very minimal change to boat pitch when you change the direction you face.

The Nagare 17 is further designed to accept an insulated and watertight tank between the two aka tubes where they run through the aft deck. You can use this for all kinds of stuff like: your catch, fresh bait storage, cold beverages if you catch and release… whatever suits your needs. There is plenty of room between the two drive trunks for a pretty good sized tackle box and lots of room up forward of the trunks for any of that “other stuff” that fishermen seem to sneak aboard their boats.

Nagare 17 aft low obl w

A moveable electronics unit can be fastened at the forward end of the cockpit, or unhooked and moved around aft if you’d rather have it facing that way.

Maybe you want to cast lures or flies instead of troll. The boat is so stable with the two, wide set amas, that you can stand up and cast all day without ever feeling like you are getting the least bit tippy. All in all, the Nagare 17 is quite a boat for fishing, as well as just plain fun, recreational pursuits.

The Nagare sisters represent a unique design family for human powered vessels. They are quick, stable and with their unique styling, represent a distinct departure from the looks of traditional boats one typically sees on any given shore or launch ramp. Both boats are designed to be built in marine ply Stitch and Glue methods for the hull sections, with cedar stripped decks to take advantage of the really beautiful, smooth curves capable from that style of building. You can paint the lower sections of the hull and leave the cedar decks natural with a deep varnished finshed, for a real knock-out boat that will really gather a crowd.If you really want to have a plywood deck build instead of the cedar strip build, write and twist my arm gently. I can design that change for those who really like to build that way

Plans are not yet complete, so if you would like to build one of these two boats, please send me an email and I’ll put your name on the mailing list for information, or watch the plans section of Duckworks for the notice.

CHRIS OSTLIND
LUNADA DESIGN
CHRIS@WEDGESAIL.COM