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PT Watercraft designs dinghies that are efficient, functional, modern, and attractive—available as kits you can build yourself. We also carry small boat parts and instructional books.

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Category: Instructional Clear

The Spear Non-Nesting PT11 explained

 

THE SPEAR is identical in hull shape to the PT 11, but the interior geometry and construction are quite different and deserve explanation.  The PT 11 has a full width foredeck so that water drains into the aft compartment, otherwise there would be three areas that would need bailing of rain and spray. The Spear can have scuppers through the main bulkhead (the nesting PT 11 can’t) and therefore can have what I call a “trunk” seat.
When rowing with three, the trunk seat allows more comfortable seating for the person sitting in the bow. The areas to the sides of the seat are good for holding oars and other things in the boat.
The trunk seat also keeps the hull from twisting under sailing loads. It’s like a torsion box. (Shown below are the PT11, left, and the beta prototype of the Spear)
ptwatercraft.com

Below photo taken in March 2013 of the prototype being built to figure out the process and to write the manual.

ptwatercraft.comTwo of the watertight hatch kits that we offer as options fit really well in this boat, making the boat versatile for carrying (and keeping dry) groceries, camping gear, cameras, safety gear, etc.
The aft hatch is easier to access when sailing and is great for things like cameras, jackets, and food, but because of the baffles under the back seat (more on that next), the volume of area under the forward hatch is much greater.
While the hatches are work to install, the cost of the kits is very small compared to the utility and safety they offer. They also provide access and visibility to the daggerboard trunk, mast socket, and rudder hardware, not to mention a good place to hide valuables left in the dinghy. Coast Guard regulations play a large role in the interior geometry of the PT 11 and the Spear. This may sound like big brother getting in the way of art, but it’s quite the opposite. The regulations are to protect us, the kit provider and especially you, the end user.
Buoyancy built into the right parts of the boat is necessary for safety. Sealed air voids (compartments) have the same value as flotation foam, but access ports or hatches are not allowed in sealed air voids. If the builder insists on inspection ports, it is then necessary to fill these voids completely with foam flotation in order to comply with safety standards. The Below Photo shows the boat before the deck and back seat lid are installed. ptwatercraft.comptwatercraft.comThe bow area (forward of the mast step bulkhead) is a sealed air void in the PT 11 and the Spear. The PT 11 has built in buoyancy tanks in the back of the boat on either side (outboard) that are equal to the volume in the bow. This is what the Coast Guard wants, and it makes sense.
The Spear has a large back seat area, but because it has a hatch, we have to install baffles to form sealed air voids outboard of the hatch where they would do the most good in an emergency. Though the baffles under the back seat decrease the usable volume for storage, they make us legal and make you safer, and they make for a well supported back seat. ptwatercraft.comBelow; Rowing the Spear with 2

ptwatercraft.comThe finished boat pictured was a beta prototype built summer 2012. Due to less specialty hardware required, the Spear base kit will cost several hundred dollars less that the nesting version. The boat will be lighter by 3 – 5 pounds. The various options, including sailing rig, offered for the PT11 nesting dinghy will be the same for the Spear. As of April 2013, we are taking orders for the “SPEAR” kit.

See our website for full information. PTW:)

Puzzle Joints revisited

Every time Russell has a boat to build, he seeks better ways of doing things. In this case, a simplified method for gluing the puzzle joints revealed itself. The manual for the PT 11 ‘Spear’ has this section but earlier versions of the PT 11 nesting dinghy manuals have an earlier method. I have created a pdf file of the 7 page replacement for pages 7 through 14 in “Building the PT Eleven” for those who have an older version and have not yet begun to build their boat. This may also be interesting to anyone building a stitch and glue kit with puzzle joints. Click  HERE to download the .pdf file.  (533kb)ptwatercraft.com

A Review by Sandy Goodall;Sailing the PT 11

The PT 11 is a beautiful piece of design work. The finished boat is lovely to look at, and a pleasure to be in, whether rowing or sailing. Even at rest, its simple yet elegant form seems to suggest smooth, efficient speed.

The daggerboard and kick-up rudder are pure eye-candy. Beautifully shaped and finished, they far exceed the foils usually seen with kit boats. They are not only well made and good looking, but their plan and cross section shapes are extremely efficient….which helps the boat sail to windward like a true thoroughbred.

Rigging the PT 11 could hardly be simpler. The two-part free standing carbon mast slides into a sleeve on the luff of the sail (like the famous Laser dinghy). Then just stand the rig up in its mast step tube. The boom has a neat “fork” that rests against the aft face of the mast, rather than the usual goose-neck fitting. Just moderate vang tension is enough to hold the boom against the mast, tension the luff, and control the leech twist.

Because the mast is a flexible, free-standing wand, it bends progressively under increasing pressure, gradually flattening the sail, while allowing the leech to open and de-power in a gust. The result is that once sheeted in on a beat, the sail needs little trimming. In fact if you lodge the tiller extension against the leeward corner of the gunwale / transom, the boat is happy to self steer to windward! This boat sails unusually well to weather, pointing high and making very little leeway.

The PT 11 is a very slippery shape, and it responds well to the lightest breezes, even with a “full grown” helmsman (230 lbs). The boat is surprisingly quick to plane, and the transition from displacement to planing mode is almost imperceptible.

Many rowing dinghies are a real compromise when it comes to sailing, but this one performs admirably, even as a dedicated sailing dinghy. I can imagine having a grand time, racing against my friends in a small fleet of PT 11’s. A real pleasure to sail!ptwatercraft.comSandy Goodall Sail Design Consulting

PT 11 Tiller and Hiking stick

Our tiller and hiking stick stock is made of Sapele. The tiller is tapered on 3 sides, shaped at both ends and drilled. The hiking stick has rounded ends, chamfered edges and drilled for attachment.

The builder finishes the tiller (on the right) by rounding the edges, hand sanding and oiling.ptwatercraft.comptwatercraft.comThe length of the hiking stick is just right to fit in the corner of the transom of the PT Eleven, for hands free steering when needed. It also folds and stows well. ptwatercraft.comptwatercraft.comTapering the tiller requires a router jig and so we offer this kit with most of the job done for you. We also offer untapered, 1″ tiller stock, for the builder’s who wish to shape their own. See the OPTIONS PAGE or the ORDER FORM on our website for prices.

Setting up and packing up the PT eleven sailing rig

I have just posted a youtube video of setting up and packing up the sailing rig for the PT Eleven nesting dinghy. This is something I was supposed to do before the Christmas holidays, and, well, I forgot. The foils you see are the foils that we provide as a kit and details are on ptwatercraft.com. The sail was our first design, though this video was taken before we trimmed up the foot just a little. We have a new design that has 2 short battens instead of the full one at the top. It is sleeved on and is really easy to manage. The shorter batten allows for a looser sleeve. Since we have had requests for a sail with a zipper luff for use with a halyard, we can now use the same design with a couple of hours additional labor to offer as an alternative. Having a halyard also means altering on the mast and adds complication over the sleeved luff. The total weight of this rig is only 13 LBS.

Prices for sails are still unknown. To have them made locally, they would cost $750-800. We are currently awaiting a quote from an offshore sail maker. ..Bummer to have to go offshore but the buyer can choose local artisan sails or production sails based on what they would rather pay. Luckily for some, principle can still outweigh cost, and we can offer that choice if someone wishes.
The mast and boom are also not yet priced. I hope we will have a price idea very soon. Being a little company as we are, it is a bit of a trick to get the carbon spars wholesale in small quantity.
To view the new video, click here, http://www.youtube.com/watch?v=KP3N_qTqPEo&list=UUVkWkVo0rpJ1I3xgJjmYUFQ&index=1&feature=plcp or visit our ptwatercraft channel. Cheers and Happy New Year! 🙂  (changed the link for the video so I did not have to use Youtube music!)

ptwatercraft.com

Self steering on the PT Eleven

On a recent cold day, we drove the PT Eleven over to Mystery Bay and sailed it up into the next bay about a mile to our boat, Jzerro. The seagulls had made a real mess on deck and we had some general maintenance to do. On our sail back to the launch ramp, we remembered to snap a couple of pictures of the “Self steering” on the PT Eleven nesting dinghy… The hiking stick is cut to the right length, and tucks into the transom corner. It gave us a chance to warm our hands in our pockets until we tacked. 🙂

Also..have you seen the latest sailing video? http://www.youtube.com/watch?v=H0dMkZcmKu8&feature=player_embeddedptwatercraft.comptwatercraft.com

PT Eleven; oarlocks and leather pads

There are several options that we have been working on to be able to offer for this boat. I will begin posting them.  Pricing will be announced on our website soon.

We are using Australian made Gaco gated oarlocks because they work beautifully and they are lightweight and also because of the reduced pin size.
The socket only requires a 5/8” hole. We plan to offer both the oarlocks, sockets and riser blocks kit as shown as an option. ptwatercraft.comptwatercraft.comptwatercraft.com

LEATHER PADS
When nested, the forward half touches the after half in four places, three of which are edges against edges. Leather pads glued on with contact cement nicely protect these edges. The leather pads that we sell have a center-line mark to help position the pads. ptwatercraft.comptwatercraft.com