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Finnish man builds inexpensive solar boat and sets off to mediterranian. Gives out the plans for free (m.youtube.com)
submitted 5 months ago by to c/solarpunk@slrpnk.net
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So i thought this fits here, he calls the boat Helios 11 and builds it with very little experience. He docunents the adventure quite well and shares what he learns, and also shares all the plans for the boat for free.

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[–] 33 points 5 months ago (9 children)

I think the best option is to take two old sailboats (already efficient hulls) and connect them together into a large catamaran with a platform in between them. This greatly increases the possible surface area for solar panels, with a minimum of water resistance added. It allows you to add a large section of solar panels in the middle without anything adding drag in the water in that section.

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  • [–] 22 points 5 months ago* (last edited 5 months ago) (4 children)

    A single-hull can be made self-righting, in case it flips in bad weather. A 35 foot catamaran? You're not getting that back up-right with a crew of one - you basically hope and pray a bigger boat comes along at that point.

    ... Now I've watched the video, there is no ballast, not even a dedicated bilge space, and with the shallow draft, I am uncertain how the boat in OOP isn't too top-heavy to stay up-right. Forget the "Sovereign Living" bit at the end, I'mma need to see some solid design and build data before listening to another word from that guy.

    In short: I take back any mean things I said or implied about Catamarans.

    I was just stanning one of my favorite things about, and pet criteria for, properly-designed boats. I just sold my first sail-boat because I wanted a bigger one, with a better capsize-rating.

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  • [–] 7 points 5 months ago* (last edited 5 months ago)

    Now I've watched the video, there is no ballast

    He does end up adding ballast later. Added batteries, living stuff and about 150KG of rocks.

    His takeaway was that it didn't really affect cruising speed and that he should have made a sturdier, heavier bottom hull.

    Edit: he's in the process of turning it into a trimaran at the moment also for stability.

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  • [–] 2 points 5 months ago

    there is no ballast, not even a dedicated bilge space, and with the shallow draft, I am uncertain how the boat in OOP isn’t too top-heavy to stay up-right. Forget the “Sovereign Living” bit at the end, I’mma need to see some solid design and build data before listening to another word from that guy.

    Don't worry, he said up front it is "rated for cross-atlantic" so it's all good.

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  • [–] 8 points 5 months ago

    Uhm. This is not done by welding a bit or using big bolts. If done wrong, your “catamaran” will not survive a single wave, let alone the conditions of the open sea. Don’t forget how much force water has.

    So if you do this on a lake, you’ll be fine, but not in open waters.

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  • [–] 6 points 5 months ago

    Catemaran hulls are specifically designed as such, you can't use normal hulls.

    You do gain the extra room for solar, but equally you also make the boat wider, making it less flacrical in confined waterways like canals and rivers.

    In high latitudes having a vertical solar sail might actually work quite well to well as both a solar array and a wind sail. But that will require significant engineering design time to get right.

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