CATAMARAN DESIGN: How Hull Volume & Bow Shape Affect Performance & Safety | Ep. 3
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- čas přidán 7. 07. 2024
- In the third part of our series, we talk again to Antoine Richer, the Naval Architect at Seawind about how bow shape, hull volume and freeboard affect the performance, stability and even safety of your catamaran.
For anyone thinking of buying a catamaran, either new or used, this resource may just save you from buying a lemon.
Timestamps:
00:00 Introduction: Welcome Antoine, Naval architect for Seawind Catamarans!
01:11 The importance of hull volume in catamaran performance
02:16 Market trends in catamaran design now & in the future
07:16 How important is helm feel in catamaran sailing?
09:40 Hull volume and how to reduce windage: sheerline, flybridges, aerodynamics
15:01 Reverse/dreadnaught bows: how bow shape affects performance
17:40 Pros and cons of reverse bows in catamaran design
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This series with Anton is excellent. This is honestly affecting my decision making on boat design/selection. Nicely done.
Thank you mate. Glad you appreciate it. The videos never perform well as they are so niche. However if it helps you, then we’ll keep going :)
ARE YOU CRAZY??? YES!!! KEEP GOING!! THIS IS TERRIFIC!!
It's really great to get so much good data on design with these interviews! Thanks for doing them!
Finally someone asking all the RIGHT questions! Keep'em coming Nick
This is great stuff thanks - really informative. Your clarifying questions and the subsequent answers greatly enhanced my grasping of the concepts.
Loving this series! So glad to see more in depth information from the naval architecture perspective.
I am assuming when he says that the reverse bow can cause submarining if the hull isn't fine enough, that he's referring to the relationship between the beam at the waterline and the beam at the deck of the hull, so as long as you aren't having ridiculous flares on the sides it should still be safe.
For example, if your LWL is 14 meters, and your BWL is 1.25 meters, and the beam only increases to 2 or 2.25 meters at the deck, it should still be safe. You can get pretty creative with stuffing parts into the bridge deck and still maintain a decent amount of space with 2 meters.
These videos have such great info thanks and keep them coming
Thanks mate. We hope that it is informative and allows buyers to make more informed decisions on such expensive purchases.
Lovely, deep technical discussion, appreciated you sharing them. Thanks.
Love these technical videos, so many questions answered and information given, Stay Safe & Fair Winds !!
Really interesting series even for a motor head like me... And identifying the underlining reasons for more speed (and comfort) from mono to cat makes all the sense in the “sailing world”. Great Series.... Thanks Nick!
Wow, a super-duper informative discussion. Very enjoyable, and thank you for airing it.
Interesting, Thanks guys!
Fascinating! Good solid stuff to consider. Thankyou, cheers Hugh
Hello Antoine, nice two see you two tackling the catamaran issues - DeWayne Young Lost in Vietnam
Cant believe that after so many years I came across such a video, where it's not the French complaining;)
Bahahahahaa. Great comment
To be honest the design aspect of the 1160 and 1260 that raised more questions to me was the way that the bows pierced the water compared to the reverse bows , and now I get it that effect/constrain is more related to the hull length and internal volume , than for design itself. Also Windage is normally one aspect overlooked when choosing a catamaran model, but if you take into account that you may not need a carbon mast or composite rigging if the design of the catamaran already incorporates a low the center of gravity, you may save a couple of thousand dollars when specking a catamaran. Thank you for the informative videos and for clarifying some design decisions that we can't understand when looking at different catamaran designs .
Awesome technical info Nick(& Antoine), thanks! I can't wait to see RR2!! Fair winds and following seas Ruby Rose!!
Quite informative and enjoyed learning more about cats. During my yacht search I had decided to include cats even though I do not care for there looks. I did find the Privilege 745 as a possible yacht to include on my list but in the end the monohull won due to a factor the cat could not handle.
Not a naval archetect, and not much of a sailor, but this is what I understand of a reverse bow.Reverse bow will pierce a wave, with the possibility of a large wave washing over the deck A flaired bow will try to ride above a wave, providing a drier ride, but much more hobbyhorsing.
Very interesting, cheers Nick
A reverse bow reduces pitching by cutting through the water rather than riding over it. It makes a boat faster and more efficient because there is less fluctuation with the displacement of the boat. With a high beam to length ratio of 5 or more it cuts it works well. As the bow cuts through the wave, the extended length and weight of the bowl displaces water more evenly along the hull. It is also safer for large wave, at least on a mono hull. If you are confronted by a large wave head on, and have sufficient power, you can pierce through the wave instead of being flip over backwards. Because once the bow has gone through the wave the centre of the hull becomes the centre of gravity, allowing the mass of the bow and low buoyancy pull the bow down. The reverse can be an issue though, going down a large wave, the bow will tend to dive instead of lifting up. This is why boats like the XSV 17 have extendable trims on the bow that encourage the bow to lift if submerged to much at too greater angle.
I've been designing a 25X5 metre boat for some time. Want it to have a greenhouse onboard, with 10KW+ of solar panels, wind turbine, kite sail and much more. A boat you can live on for years, as long as you can catch fish. It has to look sexy but also be practical. All the yacht design I see are poor design in my opinion.
Don't forget that you spend most of your time at anchor when sailing and a lot of what you are discussing is about finding that perfect balance rather than one way or the other.
When I started designing a boat, the bed was the first dimension I started with. It sets your minimum build dimensions. Mind you, I’m a novice.
Technical Tuesday on a Monday? My 2020 brain can't handle this :)
Interesting stuff, thank you.
Sorry about that 😃. Patron early access means you get the episodes early
Hahaha............. I agree !
Dreadnaught discussion was excellent and made practical sense. Thx ✌
Very interesting and informative.👍
A picture or sketch of the item being discussed would be very helpful.
Thanks!!
Really enjoy these talks with Antoine. Hopefully when you are in Vietnam he will be able to show us various parts of Ruby Rose II and explain how and why he made various design decisions. by the way I’m impressed with Antoines ability to communicate in English (I wonder in how many languages he’s fluent . I’m guessing Vietnamese as well as English and French).
A lot of Vietnamese speak French. The French colonised Vietnam for a while.
I love the conversations but would love to know how to quantify how much each of these kinds of changes really makes. i.e. reverse bow reduces the feeling of pitch by x% on a 50ft boat. Its cool to think about but context of value would be helpful :). If its a 3% reduction I probably don't care but if its 25% I might.
Its not about length on its own, its about length to width ratio and centre of gravity. For a 15 metre boat you would want a bow of about 3metres. Reverse bow makes little difference to a vertical one or slightly aft. Its about a long sleek bow.
more simplicity! even as a seasoned sailor, if you are cruising crossing oceans on a passage, simplicity and reduction of failure modes is highly desirable.
What an interview 😆
Nick, you just broke your own rule. You ordered the new Seawind without test sailing it😂
He has sailed a Sea Wind.
@@terranborn56 I don't think there are any 1370 built yet. It is not unreasonable to assume there will be some difference in handling and performance compared to the 1260.
@@heisenbugz True, but I think Nick is confident in the brand, and I'm sure is getting a good deal on it as well. We won't have an answer till late next year anyway. If he waited until after the boat was available, then he would be looking at 2 years wait instead of 1.
Great series of discussions. For your perfect boat, Nick, you just need more money
I'm not a sailboat man, but haw a few years on the high seas as a offiser in the offshore fleet in the north sea and around the world. But i think i would think more on the wind area of the boat with
manouvering in the mind. But everything will have to be in combination of different things.
The bed is the last thing I would think about. I could sleep on a sofa if needed. I would much prefer a performant catamaran. This series of videos has been interesting to watch. Thanks.
That engineer is a saint to put up with these questions. How do you reduce windage? Windage is projected area. So how do you reduce it? Reduce area. LoL. Simple. What do you lose when you reduce projected area? Height (standing room) Volume (capacity) ...Captain Obvious.
Ha-ha-ha! I immediately started Googling for an Island Packet catamaran! Thanks for nipping that fruitless endeavor in the bud.
Reverse Bow is so the wave comes up on the deck vs slamming in a racing boat. A flair has the same effect, great for the slow cruise but absolutely beats you to death in rough seas forcing the boat to porpoise violently.
Great set of videos - but I have a question.... it’s great having a fast cat, but that mean in real terms? Crossing the Atlantic - all things being equal - how much faster? A couple of hours, days or a week?
Most of the time, even for live-aboards, it is day trip and anchor overnight. What are the benefits of a fast cat in this case?
My feeling is - without any data whatsoever - that comfort should win over speed, because you only need speed 10% of the time.
Good question mate. Having just completed 25,000 nm at an average of 5.5kts, I can tell you we want something faster for a few reasons.
1. Longer passages will take less time. Obvious I know, but over 3,000 nm that means getting in 7-10 days earlier compared to Ruby Rose. For fatigue and provisioning that is a big selling point.
2. Being able to outrun weather. Fast boat mean you can get well away from bad weather .
3. And this is possibly the most important for us. Coastal sailing. We always plan for about 40-60nm daily with Ruby Rose. That’s in the height of summer and daylight, so that we can anchor before nightfall. Doubling our speed means doubling our range and getting further, to better anchorages or in earlier.
Sailing Ruby Rose Thanks for the reply. I suppose where I am getting lost - for a comparable Seawind and say a Lagoon - for your 40nm sail, is there a benefit of 5 hours over 7 hours sailing time. As you say that would be substantial.
But there is no where to find this type of data - even reliable anecdotal opinion is hard to find.
Looking forward to your next video.
David Edwards David Edwards the biggest benefit is quicker passages, essentially can cut your time in half crossing the big oceans. Therefore, you won’t be as fatigued. Getting further away from a storm as opposed to on the edge of it is another. Getting into an anchorage in the light is better for safety reasons.
Assuming you are running downwind, the difference in boat speed at the higher end won’t be that great. (Hence the reason that Lagoon, etc do well in the ARC overall). Light winds and winds on the beam is where the faster boat will shine.
Good question. Personal preference. For me I prioritise speed with "enough comfort". Speed = much more fun actually sailing, whether day sailing or long passages. Speed = safety as in ability to outrun weather. For a long passage a performance cat can easily double a comfort cat in speed so halve the time which means more fun at the end, less provisioning issues, safety in terms of picking a good weather window and less chance of unexpected storms. A true performance cruising cat like a Schionning is a "wind speed" cat ie does wind speed or better in most scenarios. Monohull cruisers or charter-production cats (eg Leopards, Lagoons etc) just can't get anywhere near that, but let's be honest - if you're building a cat for a Bahamas charter market where the customer does short day trips and wants lots of toys and gear onboard, it's not about fast sailing, 90% of your holiday is at anchor.
racing ergonomics is considered for an AC boat. Look at prada pirelli verses emerates. prada pirelli had a twin skipper approach to avoid hopping from one side to the other for tacks.
Would be fantastic some kind of episodes for monohull.
Interesting that you want to increase bridge deck clearance to reduce windage, but also want reduce hull/saloon height to reduce windage. These are competing design specs.
The only thing that accomplish those competing design aspects is size of the boat.
nice waiting for so long on news of the new cat
Somehow, I suspect this conversation is done in French first, then redone in English. Either way, very eye-opening.
Excellent discussion! So then, what is the minimum Waterline required where a Dreadnaught bow actually improves the performance of a catamaran?
So what u recommended which the best yacht
Interesting stuff.😀👍⛵️ I did not catch the detail of the specific engine you are going for but my advice is to avoid the turbo version. KISS.😉
Nick is there a reason you skipped over the wetter bit? It's quite an important consideration in a cruising boat a reverse bow does give a much wetter ride.
I am curious how the new Lagoon 43 (2024) sail and stability will compare after this "build around the bed" vid ?
To me the conflict is not on performance vs comfort but more precisely between safe sailing at high angle to the wind and comfortable ride through the waves vs space (cabin width) and payload. I'm a naval architect myself, but not involved into the development of sailing hulls since 20 years. I have been watching the videos of HH catamarans shortly and it seems to me that they have found a good compromise. Of course these boats are not affordable for normal people. But Balance catamarans seem to be at a fairly similar price level.
But it's obviously wrong, that a reverse bow has no influence on the weight concentration and therefore on the pitching also.
I'd be really curious to sail a Leopard vs an HH and an Seawind in quite rough weather.
hmm... and here i was trying to draw up the concept of two narrow Submersible bodies built to harbor a wider squat submersible body above the waterline...
The idea was to use hydrofoils while traveling and to submerge the vessel to wait out storms
my fear was that the upright floats/ballasts would rest too deep to go over reefs.
If You get a chance ask him to comment on the Lagoons structural issues i.e. SV"Impi" and SV Parley Revival having glued bulkheads delaminate etc.
The larger hull displacement seems like it'd be better in the great lakes. The fresh water being less buoyant and all. If I remember right, vessels usually sit almost 50 cm deeper in the great lakes than the ocean over 60 cm compared to some of the water around Japan and a few other hypersaline areas.
I've seen 2 cats loose their bulkheads basically permanently disable the boat! One had a 2 inch by 2 inch wood bulkhead and the other one was a lagoon! So lesson learned is if the bulkheads are made of corrosion resistant steel it's a good boat! If not it's trash and will eventually break leaving the boat to break in two under heavy seas! Examine the Bailey Bridge as a frame and then put 4 together in a box and there you go a strong bulkhead.
what about Axe bows ,,, say if I have a Hobie 16 and I try to change the bows to straight bows what would happen ?
The "balance" he talks about is what we call Static Stability and/or Dynamic Stability in aircraft design. However, boats only have to worry about this in 2 dimensions. ;-)
...show-off! :) Actually, airplanes and boats are pretty different machines. The only truly common factor is the use of fluid mechanics. Pretty much everything else is different (including the fluids themselves).
@@SerbanOprescu Actually Sail boats use both air and water... 😁. The sails more closely follows aircraft wing design with the center of pressure at the 1/4 chord point of the effective sail area. A main sail is equivalent to a high aspect ratio aircraft wing with a high taper ratio. The hull, of course, follows hydrodynamic principals associated with typical boat design... water being 800 time more dense than air. Designing sail boats have to deal with the effects of both of these inputs as well as the placement of the effects longitudinally. FUN FACT: we use the same terminology for descriptions of the dimensional terms for aircraft station coordinate system in aircraft design: Waterline (vertical), Fuselage Station (longitudinal) , Butt line (lateral). We stole these from naval design people in the early 1900's because many of the first planes were seaplanes. 😎 You see, we are not that different after all.
@@got2flynow If - and only if - you are considering fore-and-aft sails. Transversal sails use the very mundane and prosaic drag effect. By the way, boats actually use three-dimensional design, as well (you claimed 2D) - they move in significant ways in the vertical direction. I thought I should not bombard you with all this information at the time.
The nautical terminology took over the airplane industry not because most first airplanes were sea planes (they were not), but because the nautical terminology was so entrenched into the Anglo-Saxon DNA, which came to dominate the industrial world at the time of the airplane development expansion, that their terms are now consecrated. An example is the persistence of the same terms in the space industry, although most spaceships were not ...seaworthy. It is worth pointing out also that there was no other reference point to describe the new machines, while the ships were perfect for the role.
In the non-Anglo-Saxon world, such as mine and others, the terminology is not nautical.
@@SerbanOprescu ok. I'll give you 2-1/2 dimensions for boats. They better not move too far vertically, unless it is a submarine, OR you'll have BIG problems. 🙄😆
@@got2flynow :)) Well, FlyNow, thank you for the half-an-axis! I'll give you in return the Static and Dynamic Stability calculations for both the airplanes and the boats. Safe sailing, if it's a dream of yours. I already fly.
First thought: Antoine looks really young
Second thought: I recall Nick stashing cases of Busch beer 😳 in the boat. Should beer storage capacity be taken into account when designing a boat?
Final thought on Hull capacity and draft - I’m a bit shaky on sailing terminology, but it seems to me that if one loads a lot of beer on a boat, it would increase the “draft” of the boat. Correct? 😀
Thanks to you and Antoine for an interesting interview! 👍🏼
Rik, I believe you're talking about a fluid ballast system, some boats have a water ballast, but yours sound interesting to many sailors. You need to perform an extensive testing program to determine the differences in dissolved gases, and varying densities by ballast fluid. Obviously testing conditions would be at (or within a few feet of) sea level pressure ;)
Surely beer storage comes at the top of the list of design parameters!?
You would think so.
The more I think about it, the bilge is the perfect place for Busch beer.
Thanks for these videos. The catamaran market reminds me of the car market. People talk a good game about buying a 911, but what they end up driving out with is a Cayenne SUV. Turns out that speed and performance are great for brochures but less interesting when you need to bring home the groceries. The same is true of a catamaran. Would I rather have two extra knots or a comfortable bed and washing machine?
The speed is really only interesting when you are looking at long passages. Two extra knots can cut 5 days off of a 3000-mile trip. When its a 500-mile voyage its less than 18 hours.
In both of those scenarios, when you arrive at your destination what are you going to do? That's right. You are going to sit at anchor. If you are buying a catamaran to get places quickly you may want to think about buying an aircraft instead.
Any large cats that have asymetrical hull cross section hull shapes like the Hobie 14 had - thereby eliminating the need for center boards and making sandy Beach landings a possibility?
I just love that the advice to testsail the excact boat you are looking at, and not a smaller or bigger sister comes from one who buys a boat they never have been sailing 😉
Never the less I agree :)
Love nerding out over Saturday coffee. Still favor a monohull (Southerly 480 or Amel 50) but this is fascinating. Thanks.
I think what needs to addressed is the fact that a catamaran with narrow hulls is influenced by weight re performance to a greater extent than U shaped. Accordingly, a performance cat below fifty feet may be inappropriate for blue water cruising.
much like automotive engineers, accountants and management kill all the fun- when the non enthusiasts design by committee, the feel and passion of the experience is numb. I want the car to grab my gentleman bits and give them a shake. So too is what I desire in nautical pursuits as well. This is an excellent discussion.
Will never be in a position to own a boat and all the lines and "ropes" confuse me...but you asked the architect where he sees boat design going. Having watched your channel, brilliant, and aquaholic and nautistyles, the type of boat I would love to have is an aquila 44 but more as a distance trawler. Does the architect ever think that as boat types seem to meld into each other, that a distance power cat will ever be designed?
Nick, you just described SunReef catamarans, aka condomarans.
what about ane "axe" bow on a catarmaran boys?
I keep coming back to the Seawind 1190 crusier with standard rigging as the optimal for two people short handed go anywhere sailing? Weight savings over cost for carbon fiber rigging, bowsprit and hard bimini doesn't seem to be worth it. Keeps it well under $500k going in. 1260 for ocean crossings though because of diesel range vs. outboards on 1190. For Caribbean sailing back to the 1190 and its draft for gunkholeing and near shore anchoring.
Just an honest question, the Naval expert here applies the same monohull knowledge to Cats?
Honestly, it's a matter of preference, comfort, or performance. I don't think anyone should claim that a sailboat is only good if performance was the design goal. There will be always some trade-offs!
So the fly bridge has been considered as an aerodynamical issue. But how about the safety issues that come with the ultrahigh boom position that comes with the fly bridge? No matter how much you reef the main, the centre of effort of the mainsail is still high - i.e. the heeling moment is higher, and so is the risk of turtling
Nick you looking for performance and helm feel. So why are you getting away from a monohull?
McConaghy MC60 - luxurious, 8.6M beam, beautiful externally and internally, flybridge, BUT great windage, huge performance. Fastest cruising cat - almost reaches True Wind speed. Made in Australia. Designed by Kerr. McConaghy have serious racing yacht pedigree including design of America’s Cup style racing yachts. No I don’t work for them, but I have not found better specs. Cheaper than Euro made boats, but still a lot of money.
Do flat vs slant windows really have much to do with aerodynamics? I thought the most aerodynamic shapes were relatively blunt on the front with the taper on the tail? Like a tear drop. Seems flat windows and extremely slanted cockpit roof would be more aero than slant windows and boxy trailing shapes.
It seems like many customers want choices of catamaran layouts. They are the ones paying the money 💰, so the customer wants choices in design. They wants larger volume in the hulls, especially if they we plan to to live full time on board with a family.
Well done, it like getting blood out of a stone. Hope your new cat is coming along .
Just think how cheaply you could build a power catamaran if you only wanted it to do 4-5 Kts. No complex curves to form. Just a couple of cheap, easy build boxes with a pointy bit at the front
All I want is a simple learning catamaran. Something like 12’....6’ if I can get away with it. Just a main & jib.
Some unconventional concepts I wonder about: 1. Water pumped out of the stern to reduce drag, like base bleed artillery shells. 2. Air blown out at the sides to reduce drag.
The boat in my avatar pic has vertical windows, flybridge & a Axe bow...love them on a crusing boat. Widows are better for solar loads, glare and interior volume. The axe bow eats up the chop & waves on the tougher days, is more efficient, smoother etc. These guys are confusing performance w crusing boats. Flybridges are amazing. Want performance, get a Stiletto...or a windsurfer.
Is there a built-in washing machine?
Yeah there is, but first you have to take the fish out and fillet it then rinse it before you wash you clothes in teh washing machine (bucket)
Yep its called the wife
Very interesting topics but you could use more graphics / drawing to illustrate and summarize
A bowling alley in 3m seas. That I want to see. 🤣
All you bowl is strikes, though, so it gets a little boring. But getting the pins to stay in place is a bit of an issue. :-D
Interesting. Unfortunately many boating design technical terms are being used in the conversation, without graphic explanations a layman would not be able to follow without pausing, googling, continuing.
Charter cats are big money sources for some company's. High performance cat's are big money for clients.
I think Garcia Exploration 52 (a French brand of aluminum yachts) uses this type of double-folded bow. It looks cool
Hmmm nick you lead him where you wanted to go, boats are an individual thing and truly there is no one boat fits all design. I myself want to go really fast but be really comfortable crossing oceans and on the hook, yet win regattas and be sailable by two people or even solo at times. Does that sound easy... NOPE.
What we truly need, want and can afford do not always come in the same package - and who is to say we all should want or need the same thing because if we were all the same I would only be average!
Reverse bows designed by Jeff Schionning they really are fashion not function, maybe if you are racing but they look COOL
you may no think you would make a tone of money off these vids however they are rich with such great knowlage gained over life times. but some illistrations hear and there would really invite more room for more money and connection with the video
amazing info but the language barrier also the sailor Quick Lingo is vary hard to tranlsate PLEASE make more with the parts you are speaking of
Why do all parents' studies look the same? Literally the same files and university text-books from 1962?
Bowling allies ?? lol !
I don't know that I would trust a cat i watch a few sailing channels and 3 of them are sailing the world. On catamarans and 2 out of 3 have a haul that is actually cracking away from the rest or the boat well not really one made it into dry dock and one was sold for scrap they were on passage from Galapagos to Hawaii when the hall split off the port Hall they had to tie it together using dyneema line then managed to limp it in the port Hawaii but the boat was total when they got there I just don't think they are made for the pounding they take in the open ocean they would probably be fine for weekend and day sailing in coastal waters but I don't think I'd take to the high seas so to speak
I can't believe you blamed the accountants for ski racks and seven seats in an Audi..... A mini-van trying to be a performance vehicle is a product leadership error: the leader did not have a clear vision of what they are trying to build, who will buy it, and what creates the essence of the product. Blame not the accountants: our job is just to turn that concept into a price tag. I would actually say that the 7-seater sports car is a problem caused when a committee attempts to develop a vehicle without a vision.
Don't understand your mind set of "having to suffer" performance through design for the inclusion of a decent bed, dishwasher, washing machine etc. etc. - It's simple - the cat just needs to be longer and longer, keeping the narrow hull to weight ratio to accomodate what conveniences you want on board and the performance you want - you can have a very fast and comfortable, live aboard vessel - simple - If you've got the finances you can have the best of both worlds - if you haven't you have to "compromise" one or the other - performance/comforts. It's all relative to the individual's financial position (not just your own).
Joe Bloggs, so what gives decent performance and won’t squish me against a wall in my bed in a hull?
@@michynature Hull dimensions needed for the performance you desire and the on board comforts you want can be defined by the naval architect who's designing the cat (such as the naval architect Ruby Rose is discussing this subject with). As the hull design becomes longer to accommodate your "needs", the hull width will increase, keeping in line with the hull width to length ratio required for the performance you want. For example - Outremer Cats are defined as "performance cruisers", the 49 and 51 models both have full size queen beds - simple.
Joe Bloggs simple hmmm gee thanks
Still squished against a wall here so, no.
@@michynature Simple
hey guys
I allways liked your vidoes but now im walking away from this one because every 2 freaking minutes a commercial is really taking the mik
Download some sort of as block for free Sir
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People need to be careful they do not impose their own values on a discussion.
The "trend" maybe simpler higher performance cats with CZcams influences but which boat is still outselling all the others even with a history of bulkheads failing.
It is all about what suits you. Nick might not like a fly bridge but again guess what feature is one of the most sort after and enjoyed over about 38 feet.
As for safety it is not the cruising cats that end up flipped due to lifting a hull out of the water and carbon fibre is subject to catastrophic failure without warning in some cases.
Buy what suits your lifestyle and purpose. It is silly to prioritise speed just to gain 24 hours while passage making if when anchored (which will be 95% of the time) your livability is compromised.
Its horses for courses and what ticks your boxes.
i for one have been quietly following your channel for a long time .... and ive found it inspiring and objective....until today. Itrs very clear what you doing with Seawind and thtas fine....but seriously youve sold yourselves out and totally commercialised your journey to get a freebie or a good deal out of Seawind. Bitterly dissapointed in the both of you. fair winds and following seas.....
When the bow enters a wave it pierces untill buoyancy takes over and what goes up must come down. Less buoyancy less hobby horsing.
Why are you so hung up on performance. You want 2 boats in one and you're not going to get it.
Consider that even now in your monohull when you're sailing you spend 50 - 75% of the time motoring anyway. So why are you so willing to give up so much comfort for 14 knots instead 8/9 under sail? Why is that so important to you?
You are coming to cats as a sailer but thats not the point of a cat. You already know the point of a cat as you're buying one. Why are you buying it? For sailing? No. You're buying it for all the time at anchor and you want the luxury of extra space and extra stability etc.
Please get over your prejudices its long overdue.
Mcdonalds, whats wrong with a community restaurant that sells good food 😋.