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(Updated 2 May 2011)

Plans Review: Drifer 16 - Mark Gumprecht

Driade  Driade  


Boat Name Drifter 16 
Links to Order Drifter 16 Plans- $100 instant download PDF
Building Method Plywood, Stringer on frame
Length / Beam 16' LOA, 10' 2" beam ama to ama
Sail Plan / Sail Area two options, 68sqft and 61 sqft
Weight n/a
Draft 6" board up, about 3' board down
Sleeps N/A
Power Paddle
Crew 1 to 2
Number of sheets in plan set Plans come in a 62 page PDF file, 12 pages of Plan sheets (Pages 50-61)
Sheet 1 Side View (shown below)
Sheet 2 Top View (shown below)
Sheet 3 Main hull frames
Sheet 4 Main hull detail
Sheet 5 Amas Frames
Sheet 6 Amas Detail
Sheet 7 Ama Panel
Sheet 8
Beams
Sheet 9
Rudder and leeboard
Sheet 10
Rudder Pedals
Sheet 11
Sail
Sheet 12
Scarf Jig
Buildboats.com Review Mark Gumprecht has been woodworking for over 25 years and has lived in San Diego and Massachusetts. Mark now has plans for six designs: two rowing catamarans and four new sailing trimaran designs.  The Drifter 16 is the largest of his new Drifter Trimaran series.  I have been in correspondence with Mark through the development of the new plans that are being reviewed and it's been great fun to see them come together.

The plans come as a 61 page PDF document which includes, materials list, instructions with color photos of the prototypes being built and 12 pages of tradition plans sheets.  Following the table of contents and the materials list is 43 pages of detailed instructions with over 50 color photos which provide a road map to building the boat.  The last 12 pages are the plans sheets, which are detailed above. As I have described in previous reviews often times the plans consist only of plans sheets and perhaps some less detailed instructions.  In that case a couple of good boat building books are a good idea, especially for the novice.  With Mark's plans not really necessary.  You will see in his pictures his work is  impeccable, very clean, parts are well fitting, he has told me he cuts his bulkheads with a jig saw, I know personally I might go with the table saw or battery operated small circular saw with fence to get the sides straight.  

The building style I would classify as ply on frames and stringers, although on three smaller hulls the stringers are pretty light.  This should provide for a sturdy structure and with the 1/8" skin shouldn't be heavier than a similar boat of 1/4" ply built via stitch and glue.  The plans are simple to follow, though I would suspect the notched bulkheads for the stringer will provide a bit of complexity for the builder and require some attention to detail to get the notches cut accurately so all will line up as needed for a fair curve for outer skin.  That said there is always some fiddling required regardless of the construction technique.  

There are some elegant design features to the Drifter 16.  The akas (cross beams) have a graceful curve to them, and attached with a single bolt through the amas (floats) in blocking under the centerline of the deck.  Attention has been given to the shape of the rudder checks so they are functional and pleasing to the eye.  Similar consideration has been given to the shape of the cockpit opening and coming.  As some icing on the cake, plans include instructions for a seat and a wheeled cart for getting from car top or trailing to beach (shore) for launching.  

The sail rig consists of a single mainsail, which from my experience with the Trilars makes for great simple fun and should provide plenty of power.  The rudder is foot pedal controlled which is a great option, and if I were to build the Drifter 16 I would also include a push pull tiller only because on long sailing days one will need to stretch the legs every once in a while.  One other consideration is the maximum beam of  the main hull is 27" , which should provide for a quick ride, but may be tight for some, though larger than most kayak cockpits.  

Here's some commentary from Mark that he posted on the smalltrimarans.com website.

"... Norm Cross was a friend of mine when I lived in San Diego, and I used to go sailing with him while I was building my Cross 40 RC, which is the one pictured on the Cross website. What a great boat! What you say about being able to move around is true, and I have had the same thought myself on other designs I have seen. I have a 12′ tri with a high performance rig, that is just like you describe. It’s a fun boat, but more work to sail, and I have had my new 14′ model going just as fast, but much easier to sail. In the article, I said these boat were designed for a purpose. They meant to be lightweight, easy to sail, easy get into, for older or inexperienced sailors. They do this very well, and are a pleasure to sail. When you put seats on either side, you lose the ability to paddle, and it’s harder to get into. If I design the boat to be sailed harder, and in rougher conditions, it is going to have to be built heavier, and I don’t want a heavier boat. I don’t want to have to launch the boat off a trailer, at a launching ramp. Every boat is a compromise depending what your priorities are, but these boat are a big improvement over most of the small boats out there. I designed the new 14′ model to be sailed in many different modes, depending on the conditions. One is to have seats on each side that slide out of the way, so I can still paddle. This will allow me to move my weight around, and I’m sure the boat will be faster. I will have a removable tiller when I am using the seats. The seats in this boat will be big enough to sleep on, so I’m going to make a tent for the cockpit, so I can camp on the boat. Adding stays to the windsurfer mast give you better sail shape, and I put a small roller furling jib on, with really improves the performance. But there is a beauty in simplicity on those days when you are lazy, it’s late fall, and getting cold, and you just use the basic rig, get cozy under the cockpit cover, and enjoy a beautiful day out on the water."

In conclusion the Drifter 16 is an elegant small boat.  The plans should allow for most skill levels to be able to build.  The resulting boat has got be to a blast to sail, easy to transport and store.  With any small trimaran that can be tranported in this way, you'll need to allow for assembly and disassembly for use. Plans are available through www.duckworksmagazine.com

 

 


Sheets 1 and 2                                                                             

Drifter 16 sheets 1 and 2

Sheets 5 and 6 (note some measurements removed for copyright)

drifter 16 sheets 5 and 6

Sheet 11 Sail Plan (note some measuremetnts removed for copyright)

drfiter 16 sailplan