You guys are amazing. What a build. Glad to see Anna and Kevin happy. Thank you for sharing your boatbuilding with us.

What a tremendous project! A fantastic family! Congratulations and speedy recovery for Ania!❤❤❤

One of the best catamaran builds on KZread and (almost) no one cares - typically German. I can't wait to see it finished, this bee will fly !

@paulb9842

2 ай бұрын

let us share it!

Thank you for re-uploading, video plays perfectly now 😎 Not much left to construct on CarbonBee it seems. Congratulations on Kevins engineering degree and Annas new knee also.

@bojanu7212

9 ай бұрын

Thank you for the info and for the congratulation for Kevin and Anna.

Ich hoffe es geht euch gut und ihr kommt etwas vorwärts mit dem Besten Build das ich je gesehen habe :)

@bojanu7212

2 ай бұрын

Schön, dass es dir unser Katamaran gefällt. Danke! Wir sind gerade dabei die Innenausstattung zu bauen und installieren (Sitze, Schränke, etc.). Es ist viel Kleinarbeiten. Zu deiner Frage wovon wir die Hauptmaterialien bekommen: meistens von R&G, HP-Textiles, Maricell.

WSPANIAŁA ROBOTA!! Widac postepy prac. Zasubowalismy i bedziemy na bierzaco podziwiac postepy. Wytrwalosci w realizacji marzen oraz pozdrosy dla Ani, Bogusia i Kevina😉

Great content! Thank you for the videos! This is such an incredible build!

You are doing some great work here! Those electric motors with the arrangement for raising and lowering was really something special.

@bojanu7212

9 ай бұрын

.... and under sails we can lower them and they will generate current, if we need.

Wow... that new propulsion system is great.... I am very interested to see how this progresses.... well done...

@bojanu7212

9 ай бұрын

Thanks! CarbonBee is extreme light and has very low air and hydrostatic resistance, so we decided that 2x 6 kW electric motors are more than enough. Computer simulation show, we will reach 10-11 knots maximum speed easily... and under sails we can lower the engines and get enough current for Anna's demand 😄.

@pauldegan8324

9 ай бұрын

excellent@@bojanu7212 When do you see the completion...?

@bojanu7212

9 ай бұрын

​@@pauldegan8324 We don't work in the winter, so few months go out, but we plan to make first tests in 2025

1st :) Beautiful boat! I hope that you come out with a video explaining all of the details like dry weight, measurements, cost of the materials to make the hull out of carbon fiber and all of that sort of stuff.

@bojanu7212

9 ай бұрын

Thanks! A lot of the information are in the description under the video, and in my answers on the comments in previous videos. It is good idea. I will think in the future about one video which will answer the common questions.

@robertlaird6746

9 ай бұрын

@@bojanu7212 Yes, answering those questions in a video will really help out. I've gone through some of the questions and answers in some of the videos but it's difficult to do that. That's why I'm still asking about these things.

Funny to find this, I've been building the same type of carbon fiber leg extension for two ePropulsion Pod 6.0. I was just laminating it yesterday! My usage is on a regular outboard electric hydraulic tilt/trim thing on my Seawind 1000. First I made the legs in steel for testing and now I'm redoing them in carbon fiber with an hydrofoil type of fairing around the flange where it attaches. The core is 3D printed ABS, with a carbon fiber epoxy cast foot, blending into a mix of unidirectional and plain weave on the skin.

@bojanu7212

9 ай бұрын

Super! How do the Pods perform?

@AntoineGrondin

9 ай бұрын

@@bojanu7212 they work very well but haven't got regen to work with my non-eProp propulsion bank. I wouldn't go another way though!

@AntoineGrondin

9 ай бұрын

More details, I didn't want to use the ePropulsion batteries because they (1) shut off automatically (2) are pretty heavy in terms of kWh/kg (3) don't support CAN to interact with my Victron GX setup and (4) didn't fit well in the space I had available. So I made a custom battery pack with CATL cells (280Ah) and an ORION BMS. I've been slowly reverse-engineering the code to make the ePropulsion motor controller turn on the regen, but I've stopped working on this recently because my solar production has been more than enough for my needs so far. I might go back to it later, or I might replace the ePropulsion controller with another motor controller that is more "open" to configuration. Or I might put a small ePropulsion battery "in the loop" just to turn on the regen. We'll see! I wish there was more options on the market! But electric propulsion, especially with retractable outboards/pods, is so amazing. I just love it. In addition, when the sun is shining and the battery are full, you start to use your engines in a different manner. There's literally no reason not to run an engine and go a bit faster when the sun is overflowing you batteries. So I end up motor-sailing even though I would otherwise be a sailing purist on a dino-juice boat.

@bojanu7212

9 ай бұрын

@@AntoineGrondin Thank you for the info. I didn't buy the batteries yet. So, I have to consider that what you said. Sure we will have the solar panels too, but on my rough estimation it will not cover our needs. Still I wasn't busy enough with this theme, because I do have still a lot of other issues to solve.

@AntoineGrondin

9 ай бұрын

@@bojanu7212 how much solar are you planning? I went above and beyond and shoved 2,280W overall on the coachroof top and over the arch, and we have a 10m catamaran. You should be able to put more, depending if you prioritize it or not. Mine is all over the dinghy, keeping it shaded and staying in the shades. But it's ~25kg per panel, not so light. Custom panels can be made that are lighter but I haven't gotten there yet, I just wanted a functional prototype with as much surface area used for solar as possible. I'm considering adding a lightweight diesel genset, like the Hatz 1B50 fiPMG, but this would require some creative designing for the air-flow to account for cooling and exhaust. But it's an incredibly lightweight direct-DC 48V generator that's compatible with Victron. Note that there's an exponential curve to power vs. speed. The curve looks best (to me) around 2-3kW of power, to motor at 4-4.5kts. This is a good mix for me of speed and power. I can do 3kts at 800W. Going fast, for long, with my engines isn't something I'm counting on. Sails are for that, otherwise we just need something to move a bit at a steady pace.

Please post more! How did you get the structural requirements figured out? Is it also something you calculated in your CAD or did you outsource to a structural engineer? I'm interested as I design a cat

@bojanu7212

5 ай бұрын

First, thanks for the comment. For the structural calculation I used SolidEdge which has well working FEA module. Without the correct calculation I would not advise to design such complex structures as multihulls. If you do not have experience in this matter I would advise that you design the general shape you like, and look for advise of known yacht designer, which has experience in multis, because it is not only the structural calculation and choosing of the correct material and its quantity , but also it's about of many air- and hydro-dynamic aspects around. Wish you success in realisation of your dreams. 👍

how does she sail.. ? we need a video!!

@bojanu7212

2 ай бұрын

... in my computer she is fast, very fast 🙂.... , but unfortunately she is not ready for sailing yet 🤷

Grandioses Projekt! Ich hoffe auf weitere Videos! Darf ich fragen, welche Materialstärken ihr für den Außenrumpf verwendet habt? Corematerial und Laminat. Ich repariere gerade eine alten Rennkat und interessiere mich für die Technologie... Grüße von der Ostsee...

@bojanu7212

2 ай бұрын

Danke! Materialstärken welche wir verwenden kann man nicht so einfach für anderes Boot übernehmen. Es ist ziemlich komplexe Aufgabe, welche von vielen Faktoren abhängig ist. Bitte um Kontakt auf: bo_janu(at)yahoo.com.

Wielkie i szczegolne pozdrowienia dla Ani i Kevina. Wasze dokonania sa godne najwiekszego i najszczerszego podziwu!!! Wasza CarbonBee nabiera juz coraz bardziej realnych ksztaltow. Nie moge sie doczekac Wielkiego Wodowania!!! Dajcie mi znac kedy to przyzekam, ze sie stawie...

@bojanu7212

9 ай бұрын

Dzięki! Naturalnie Wielkie Wodowanie będzie ogłoszone. 🙂

Hard to see, but what is the brand and size of the motor? Thanks

@bojanu7212

9 ай бұрын

it is: e-propulsion

@DenySmashinton

9 ай бұрын

​@@bojanu7212Great build! How many kw are motors and how big is the prop?

@bojanu7212

9 ай бұрын

@@DenySmashinton CarbonBee is extreme light and has very low air and hydrostatic resistance, so we decided that 2x 6 kW electric motors are more than enough. Computer simulation show, we will reach 10-11 knots maximum speed easily. The propellers have 320 mm dia.

Weight is different from displacement?

@bojanu7212

9 ай бұрын

Yes. See the description under the video.

@deerfootnz

9 ай бұрын

@@bojanu7212 how can weight and displacement be different?

@bojanu7212

9 ай бұрын

@deerfootnz To explain simple - displacement is (in ship building) understand as the volume of the water (or their weight) pushed out by the ship, and calculated to the construction water line. It is calculated as the weight of the ship and the weight of the cargo (here: the crew with all belongings, drinking water, fuel, eatables, etc). Weight of the boat is considered as it is empty.

@deerfootnz

9 ай бұрын

@@bojanu7212 so you are actually talking about lightship displacement versus fully loaded displacement.

@bojanu7212

9 ай бұрын

@@deerfootnz Yes, correct. - Lightweight + Deadweight = Displacement. I use the "Weight" of the boat instead "Lightweight" because it is better to understand for most people and the translation in other languages is correct.