Boats / News / plans


We would like to introduce our new design. First time it won’t be a proa :). It is a concept of 6 m long catamaran for 2-4 people for day sailing, launching from beach for day sailing and also for longer – few days trips. We worked few last months on this project, including model which helped us to plan and check some assumptions.

About CAT 600

An efficient crew can launch the Cat600 PJOA straight from the beach, cross the surf and, on their return, haul the boat high onto the sandy beach with their bare hands.

From the very first sailing trips along Baltic coasts I’ve been dreaming about a night rest without building a tent on a beach. At last we can offer 2 sleeping berths in hulls plus 2 more on a platform under folding roof.

We remain faithful to the pleasure of sailing under Crab Claws rig and rely mainly on self-steering of the boat, which is well balanced by adjusting the sail’s and crew positions. The rudders will gprovide more comfort for a casual sailor, but may not be able to completely counteract and steer against the bad balance – that’s intended 😊. During the design process, we paid a lot of attention to effective methods of the sail regulation.

There is no daggerboard or deep rudders requiring attention when crossing shallows. Our small rudders apply a solution observed on Pomeranka fishermen’s boats, where small blade gets itself up if touched by the sea bottom and goes down when it is possible.

The rig and platform can be easily disassembled for transportation on a trailer.

The Cat600 PJOA hulls are made in Stich&Glue technology of plywood sheets reinforced with longitudinal slats, supported by 4 frames from wooden planks. Covered with glass/epoxy. This hull concept was proven during the operation of the first Pjoa, Mata Pjoa and more recently several Folk Pjoas. Here we introduce even greater simplicity. We estimate that a single hull can be shaped ready for finishing within 1-2 weeks depending on skills.

Beams and all spars are from wood, with eventual exception of trapezoidal mast frame, which may be made of aluminum tubes.

Together with plans, we distribute the sail (Dacron or polyester) specially cut to be spread between curved yards.

  • Lenght: 630cm (20,6′)
  • Beam: 402cm (13,2′)
  • Draught: 45cm with 2 people crew or 55cm with 400kg on board
  • Weight rigged: ca. 250 kg (555 lbs), where heaviest is the single hull: 85 kg
  • Crew: 2-4 person (max load 400kg 890 lbs)
  • Crab law sail: 12, 14, 16 sqm
  • Dimentions for storage, transport: 630 x 160 x 100cm (20,6′ x 5,2′ x 3,3′)

Plans in hard copy for PJOA Cat 600 are now avalible.
Plans include:

  • materials specification
  • suggested order of activities
  • 1:1 drawing of importatnt elements,
  • other drawings in regular scale and
  • license to build one boat.
Price: 520 EUR (without shipping)

Please contact us for order and prices via e – mail:

DIY kit in preparation! More info soon.

Follow our building process in separated posts, starts here:

Work in progress – PJOA Cat600 – pt. 1


    14 December 2020 at 01:55

    bonjour les coques sont superbes bravo , la poutre centrale est trop massive, pas très esthétique est il possible de profiler un peu sa forme ? la pince de crabe est bien mais la voile est trop petite par petit temps . A quoi servent les ailerons sur les cotes de coque ..?. la construction en contre plaque très bien , à quel prix penser vous sortit le kit ? prévoir une option avec un greement classique de catamaran avec mat central et voile lattée style catamaran Dart serait bien . félicitations les coques sont superbes

    • Janusz Ostrowski
      14 December 2020 at 15:48

      Bonjour. Content que vous aimez les coques.
      Vous avez de grands yeux 😊. Le faisceau central est calculé moins massif comme indiqué sur les dessins et en forme de parabolique le long.
      La superficie maximale des pinces de crabe que nous considérons comme réalisable pour ce chat est de 16 m2, à condition d’insister sur une bonne qualité de suivi..
      Les ailerons ont un double rôle: vider le cheval de loisir et laisser l’équipage marcher dessus en remontant des eaux profondes.
      Gréer différemment ce chat nécessiterait de repenser la structure entière et nous perdrions probablement une partie importante de la capacité d’équilibrer le bateau et de garder le cap sans utiliser de gouvernails.

  • john wadman
    14 December 2020 at 02:55

    very cool. much like some of Wharrams designs..

    • Janusz Ostrowski
      14 December 2020 at 15:21

      Thank you, I’m taking it as a compliment about the style 🙂 , but please look closer.

    22 December 2020 at 13:43

    Bonjour, je veux en construire un à Madagascar , les plans sont ils disponibles et à quel prix ? , merci

  • Dimitri Chernyshov
    24 December 2020 at 18:19

    What are those little winglets on the bow and stern?

    • Janusz Ostrowski
      26 December 2020 at 19:53

      Thank you for asking. The main purpose is to dump hobby horsing.
      These should be also steps to let the crew get on deck easy after launching from a beach or even out from deep water.

  • Edward.
    27 December 2020 at 23:12

    Congratulations on a good job well done. Please inform me of the cost for the plans also for the finished pjoa.

  • Tim Walls
    28 December 2020 at 04:27

    I love the design and simplicity of the boat. Do you sell plans or kits? Thanks. Tim

    • Paweł Kowalski
      28 December 2020 at 23:03

      Hello Tim,

      Thanks a lot :). Its our new line of boats but design is still based in traditional crafts. We will sell plans in price of about 285 EUR (hard copy). We also want to make sets of: plans, one of our Crab Claw sail (12, 14,16 sqm) and metal fittings. At this moment we are finishg detailed project, plans and sets are next steps.


  • Paweł Kowalski
    28 December 2020 at 22:54

    Hello Edward,
    Thank you for comment. Plans will be avalible to order in hard copy for about 285 EUR puls shipping costs. At this moment we are finishing detailed project and as soon as it will be ready will star with plans. Additionaly you can buy our Crab Claw sails 12, 14 and 16 sqm. About finished boat I could tell more if you write me where it should be shiped, from our expirience shipping in Europe can be affordable.


  • Edward
    29 December 2020 at 13:24

    Hello Pawel, do you do digital PDF plans or video which don’t require posting? I could collect the finished boat from the postponed Warsaw boat show. Cheers, Edward.

  • Edward
    30 December 2020 at 01:34

    Hello Pawel, is a digital plan pdf + video possible? I could collect the finished pjoa from the postponed Warsaw boat show. Cheers, Edward.

    • Paweł Kowalski
      30 December 2020 at 11:50

      Hello Edward,

      we usually do not sell plans as a digital pdfs, just printed plans in scale + 1:1 stencils, wide description with photos of building process, instruction of rigging and basics trimming.

  • Edward
    4 January 2021 at 10:19

    Çrab claw sail 12, 14 & 16 sqm price please. Is Dacron different price from polyester sail? Thanks.

    • Janusz Ostrowski
      4 January 2021 at 13:28

      Hello Edward,
      All the best to you in the New Year 2021 :).
      Please find below dacron sails pricing:
      12 sqm – 492,- €
      14 sqm – 561,- €
      16 sqm – 655,- €
      Price includes VAT, but we will have to add a cost of the postage.
      I’m asking you kindly to give me a call. The number was sent by email.
      Cheers Janusz.

  • Rael Dobkins
    11 December 2021 at 07:24

    Looking Very traditional, nicely curved lines, almost doesn’t look like it’s plywood construction….
    Lightweight for easy transport, yet very good volume for load capacity. I think the Pjoa Cat will change history….
    Good Luck, Balkan Shipyards.

  • Simon Salopuka
    16 April 2022 at 16:38

    How much would such a design cost?

  • Simon Salopuka
    16 April 2022 at 16:39

    Thank you for reply on the cost of this design proa.

    • Paweł Kowalski
      20 April 2022 at 09:22

      Hello Simon,

      thanks for question, plans for PJOA Cat 600 costs: 520 EUR


Leave a Reply to Edward Cancel Reply