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Seaclipper 20 Plans Now Unleashed

The building plans for Jim Brown’s new “Seaclipper 20 trimaran” are now for sale at www.Searunner.com. Upon release, Designer John Marples sent me the following … “Joe, The plans are officially available for the Seaclipper 20, including full-size patterns for all bulkheads. There is a total of 9 sheets – including the patterns – so they are very well detailed. Plans also include the Liquid Joinery and Standard Details booklets, and papers on Rigging and Metal Parts. I mailed the first bunch (4 sets) today. Cheers, John”

Based upon the fact that many guys have been chomping at the bit for these plans to be released, I’m hoping lots of these rugged camp-cruisers will be built all over the world. Not only is the construction process super simple, both Jim Brown and John Marples have really put lots of effort into keeping building costs down. You can see this for yourself in the prints and short video below, which shows Jim’s model of this new craft.

Click on the images below. Then check out video clip with Jim talking about the Seaclipper 20’s features via demonstration of his model. Then visit the order page at www.Searunner.com to acquire Seaclipper 20 trimaran plans.

Seaclipper 20 Trimaran Drawing #1

Seaclipper 20 Trimaran Drawing #2

Here are full pdf links to the above images:
Seaclipper 20 trimaran pdf #1
Seaclipper 20 trimaran pdf #2

And visit Click here to watch Jim Brown’s new Seaclipper 20 trimaran video, which shows his model.


  1. G’day Joe,

    I’ve been all over http://www.searunner.com like a rash but I can find no mention of the Seaclipper 20 plans. Can you please point me to the URL that contains the sales page for the Sea Clipper 20 plans.
    Thanking you in advance for your help.


  2. Hi Bill,

    Great question. I spoke to John Marples today and he told me that his website hasn’t been updated yet. As far as I know, the sale price for the plans is just $250. But please don’t hesitate to contact John directly for any questions, including plan pricing. He is always happy to respond to email questions and his phone number is also listed on the Searunner.com website.

  3. Joe, this is very exciting! I think there is a great market for this design. Cost effective, trailerable, and a relatively simple build process.

    As expected, John is very responsive and I look forward to seeing the study plans next week.

    Did you get any hints from Jim, John or Scott on the typical material costs?

    I can confirm that the plan price is $250 and the study plan is $20.

  4. Congratulation for this nice new trimaran! I sailed a tremolino years ago and had so much fun and speed. Are the plans also available in metric measures? Many european hobby boatbuilder would appreciate this service :-) Thank you and best regards from Hamburg, Klaus

  5. Hi Mark, thanks for confirming. I’ve never discussed the material costs. From what I can guess (based upon my recent inquiries into the cost of wood, used sailing rigs and epoxy this year), if you can get a used cat rig with sails cheap (or free) … and if you can buy plywood with exterior glue (not necessarily good looking “marine-grade” ply) then the most expensive material will be the epoxy and fiberglass sheathing. Budget at least $1,000 for the epoxy and cloth. So the entire project could run somewhere between $2,200 and $3,500, depending upon how frugal a builder can be.

  6. I’m glad to see this type of boat experiencing a resurgence. It’s exactly the type of use my Tamanu build will see. I love the down & dirty user mentality of the build. Moreover, with Brown and Marples’ experience you know it will be a nice performing product. I am a bit disappointed in the 800 lb dry weight prediction as I can’t see a real beackcruiser dragging 800 lbs up a beach, but perhaps the weight reflects the cheap and thick ply specs in the design. In all other respects, I love the design ideas though. Inexpensive rigs to reuse makes most of these projects accessable though. I love how the boat is foldable on the water and the rig can remain stepped throughout the process. Having a stable camping platform afloat is really nice as well. Stepping the rig, launching, and then unfolding seems smart as well. I’m right in the midst of my Tamanu project, but the Jaganda is a really nice approach for quick building, quick launching, and quick sailing. Love the concept!


  7. No-one has commented on this page for a while. Has anyone else tried finding out how to buy plans for the SC20 by clicking on the link? I have tried but haven’t been successful. Any tips?

  8. Hi Drew,
    John has had lots of problems updating his website. It’s a long story that I won’t bore you with. Just know that you can always reach him via email at marplesmarine AT gmail DOT com if you want to purchase any searunner / seaclipper multihull building plans.

  9. Pity about the website but great that I can still get hold of him. Thanks for the info.

  10. Drew, let me know if you have any problems contacting John. (You shouldn’t, as I use that email address I gave to you all the time). I will assist you in reaching him.

  11. Thanks,

    It seems he is on holiday untill 13th May? So I expect I’ll get a reply from him when he returns.

  12. Hi Drew,
    Yes, apparently John is on vacation until then. He is always available when he is in the office so he should be around to answer all your questions then.

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