Motoryacht project?

Originally Posted by capt_jack

I wonder why so many sailboats are making use of it?

There are really not many on a worldwide scale, maybe 1 pro mille. but I guess much less.


There are quite a few others, including a system built by an owner who now markets the solution via his own business.

That one is still just trying to make a business! And the upfront cost is enormous.

Granted a sailboat can recover energy while sailing to some extent but if the system can be scaled down to be light enough yet still hit hull speeds of 11-14 knots there's not much of an excuse for a motor yacht not to be able to get even better performance.

A sailboat cannot recover energy by spinning a prop /gen setup! It can convert energy from speed to el. but that on a very inefficient level only. It makes no sense to slow a boat down that way and carry all the weight.
How would a motoryacht have a benefit?
We had that discussion here quite several dozen times, it is not feasible. period

The CPP mentioned is the right solution to have a reliable and affordable propulsion that operates in different conditions. look here:
The Controllable Pitch Propeller, a summary.
That will give you a deeper insight on such system (though there are many premature comments, in the end you will see the light)

Which boat in the range you were talking does a hull speed of 11knots? let alone 14.... right, none.

I think it would be wiser in my case to purchase a good, used boat and learn her well, make my first build project a tender for her and take my time before having my ultimate goal boat built. (Doing the parts I can do well and having the experts do the parts they do well - my family will be on this thing after all).

That should help me make more informed decisions about what changes to make to the interior of the design and hopefully allow me to convert a recession deal into a lump sum payment towards the custom build.

What I say.

Regards
Richard

[eric le marin]

Even more generally, the best way to improve a system is usually to find the worst part of it, and focus on this part.

Screws have a very bad efficiency, coøpared to the rest of the boat. So, it is THE thing where to put money. But that is also a very complex issue...

Originally Posted by eric le marin

Screws have a very bad efficiency, coøpared to the rest of the boat. So, it is THE thing where to put money. But that is also a very complex issue...

Handled here..............


The Controllable Pitch Propeller, a summary.

[capt_jack]

Originally Posted by eric le marin

This single moment would pay for all the hours spent on the construction.

Do you have any drawings of the process or the shape of the hull prior to the final step of sealing the ends? I think I understand how it was done now, my only concern would be the amount of stress placed on the "bend" and possible metal fatigue issues.

I may have a couple of ideas on programs which could be used to predict the required shape needed to accomplish a desired hull but I need to make sure I understand what your starting point was prior to making the bends and welds.

I have my own ideas about a modified composite build technique that has a similar tact in that it would be economical for a home builder but probably not offer much in the way of incentives to multiple unit construction. I still plan to follow the path of buy used / build custom later but I'd still like to experiment with some on shore scale models.

[EuroCanal]

Originally Posted by eric le marin

This very special feeling, when finally, everything works ok ? That you have the bimini on, the auto pilot, the asy spinaker in the air, and that you look at your boat sliding on the long swell at 10,5knots, on your way to the tropics?
This single moment would pay for all the hours spent on the construction.

Joli bateau. Chapeau ! Merci d’avoir partagé l’histoire et vidéo de la construction – c’était fascinant.

[kerosene]

Originally Posted by capt_jack

I wonder why so many sailboats are making use of it?

http://thefraserdomain.typepad.com/e..._sailboat.html

There are quite a few others, including a system built by an owner who now markets the solution via his own business.

because your claim that markets and manufacturers are against progress is false. There are plenty of innovations or green tech that is being sold for purely emotional reasons - not because the product is a good practical solution.

I was reading about small windmills (<10kw) when visiting my parents farm in Finland. They are the new hot thing and being marketed by several companies very aggressively for rural homes and farms. 25K euro windmill has a payback time of 30+ years assuming no repairs is needed and this with current super low interest rates.

I really like the idea of creating your own energy but if a system that provides few hundred euros worth of electricity per year costs 25,000 the solution is not ready.

Hybrid is hot due to the big benefit it traffic but boats are very much unlike cars. Take a modestly powered 1.6l corolla and try to drive it at 80% power output for an hour. You cannot do that except on a race track or pulling trailer uphill. Boats do that every day. Hybrid provides nothing in a system where close to max power is used.

[mydauphin]

Buying a used boat is much cheaper than building, it is the way to go but beware of fine looking boats fixed with Bondo or motors just rebuilt. There are many scammers that will sell you a boat that is falling apart and you can't tell. A good surveyor will be able to tell - well worth the money.

[FAST FRED]

My suggestion is to go to "Boats and Harbors" and find a good hull.

The hull is much of the work , almost all the risk, and can usually be purchased cheaper than you can build one todat.

My favorite (which I own) is a US Navy 50 ft Utility boat.

These are superb military GRP construction with fire retardant resin and full foam flotation.

The interior is as an open boat , but a couple of hours with a sawsall and grit blade will open it up .

They can be found with no engine and running gear (UGH) for as little as $5000 to $10,000 , complete with low time (say 200 hours) ready to drive away for about $35K.

You can build the deck and deck house of your dreams with close to house style construction , so cheap that IF it takes 3 times to "get it right" the cost is still minor.

50loa about 15ft beam 20,000lbs hull 45,000 loaded.

With our antique WWII Detroit 6-71 3x1 reduction and 32 square prop we get under 3gph at 7 or so K.

Get one with an engine and install a 30-35 ft Airstream and your cruising almost instantly.

The yacht purists may balk but it gets a complete cruiser for almost nothing.

FF

Originally Posted by capt_jack

Yes, I'm still going through them all. These are some of the most beautiful and solid boat designs I've seen to date. I especially like that the designer has included the option for diesel-electric propulsion on the larger craft..

Nice.

Forget about Diesel electric, there is no sense on a yacht. We handled this issue already to death here............

But you might consider a CPP being a real advantage on a passage maker.
Read Kasten´s comments on CPP´s!

Regards
Richard