International Climate Strike

Proasis proudly participated in the international climate strike on September 20th.

Together with 15000 more we blocked the main highway of our state capitol Kiel.

250000 people marched in Berlin, 1.4 million in whole Germany and multiple more around the entire world!

100000 in Hamburg

We are amazed and grateful to be part of making environmental protection and conservation a mass movement!

We rise like the sea level!

Rig production is going on!

As promised in our last post we managed to the sail this week!

As sailcloth we got a strong PE sheet (also known as polytarp). That’s exactly the sort of stuff the people in Micronesia using for there sails.

Exceptionally we bought it new but spend only 40 bucks.

Nice place for lofting! Thanks to STS, our sailing club, for their gym!
Laying out everything to get the shape.
Cutting the cloth
Sewing. We used a very cheap DIY sewing machine, nothing special for sails. It worked well but but professional machines would give a better result.
More cutting . . .
More sewing . . .
Finished !

We hope to setup the sail for test purpose during the next days. Read more in our next weekly update!

Rig production started

Maybe an odd way to start building a boat, but the very first part of proasis will be the rig (naval term for mast, sail and all other parts belonging to them). Why? That’s a bit of a story:

Originally, proasis was supposed to get a free standing carbon mast (free standing means no shrouds to hold it up) with a soft wing sail on it (see a video of something similar here).

1:5 model of the originally planned wingsail

Aside of the not very sustainable carbon part we never got happy with the design:

  • Much additional work for the mast construction
  • High expenses for the materials
  • Even more work for sewing the sail (it needs sewed in shape!)
  • High bending moments in the leeward hull around the mast bearing
  • Unsustainable design, many new and non degradable parts involved

We thought about many workarounds and fancy designs but eventually came back to the (Marshallese) oceanic lateen sail!

Marshallese canoes with oceanic lateen sail

Proofed for centuries on the pacific, the biggest ocean of our planet. For us the best sail possible:

  • Decent performance (we measured the performance of marshallese canoes!)
  • Simple and cheap to build (spars and flat cloth only)
  • Low center of effort
  • Low stress in the sailcloth

For the spars we were lucky to get tons of old windsurfing mast for free by our sailing club:

Old windsurfing mast, ready for recycling!

The windsurf mast were simply transferred into mast and booms and laid out to test the geometry for shunting:

Geometry of our sail

Next week we will get some cloth and sew the sail. Stay tuned!

Windward hull mockup

Now, after the 1:5 model proa proofed our general concept by amazing sail performance it’s time for something in real size!

To get an impression of what the living conditions on proasis will be we made a full size mockup of the accommodation compartment in the windward hull. In manufacturing and design, a mockup is a scale or full-size model of a design or device, used for teaching, demonstration, design evaluation, promotion, and other purposes. It is probably best known from the automotive industry for show cars, but is an important part of yacht design too.

Our mockup taught us a lot about usability, ergonomics and structural design of the cabin.

As you can see, its a quick and dirty construction from scrap wood and paper boxes. All of that was recycled by us and therefor for free!

Preparing ribs and bulkheads . . .
. . . and finished with paper sheets on! We made only one bow due a lack of material . . .
For comparison: this is how the windward hull looks like from above in a simple CAD model . . .
. . . and this is real life!
Having lunch in the surprisingly spacey insight of proasis! Four adults could sit there comfortably and sheltered for meals, two sleep in the cozy bunks in each bow over night.
The design office got transferred into the mockup for a couple of days: after spending a lot of time inside there we are confident to build a suitable accommodation!
Simulation of the galley/stove area