Trimaran with accomodation in the amas

That may well be true , but with a boat that size I think I could afford to sail along at a comfortable 12 kn to 15 kn which would not be much higher than 1.34 disp speed for a 72' boat . If I had enough money to build a boat this size then I would be taking alot of vacations sailing on big cats and tris . A horstman 65 has room for the captain and crew with 2nd galley below deck and 11 queen berths above, thats only four berths off,and if you can fit 4 kids to a berth who knows a 65 might work.

 

Speed is marketing. A family ( lg family!) cruiser isn't going to want excessive speed - no matter what the poster says....
In perfect conditions speed is great. How often do we get perfect conditions?
Comfortable is debatable .......
Family cruiser? Charter yacht? Racer.......
Most conditions are far from ideal.
8-10 knots being god/acceptable
That'd be good in a mono of this length.

 

A good place to compare the same length cat and tri would be to go to Pedigree Cat and compare the Horstman 104 tri and the Pedigree 105 cat , both designed by Ed Horstman. If Ed could have designed as much interior space in the cat as the tri I assure you he would have, a 18'6" differance in the beam cant be over come. Space for length the old wing designs cant be beat, pay load is another matter. It would be nice if a designer took interest in the older cruising wing deck designs and designed some 33' and under boats, this size tri out shines the cats in space and cost of build per pound. Rick

 

Giving the op lots to think about......
That's good.
Beam difference is meaningless if the tri doesn't lift a hull.
Payload is Important with that many people... But what distances?
Back to the S.O?R.........

 

I really appreciate all this comments and technical debate,
please excuse me if I take time to answer and comment,
i'm not English mother tongue - expecially not in sailing terminology -
Just thanks to Richard for all his professional hints and offers,
for the big catamaran there are two things,
all the rooms are needed double, king size bed, no single bunks,
and for the moment i'm absolutely fascinated to the idea of a 78feet trimaran.
Just considering all the problems about confort in the ama's cabin during navigation
and this - first time I hear of this - parassite waves that drag 20%.
This I will study and investigate in detail.
About the disances, mainly in the Mediterranean means 600miles longest leg about.
see you soon
ciao
Eiasu

 

Austel builds bigger tri's and cat's for the military here in Mobile than the 70' or 80' that you will build. If a large tri works ok for the U.S. Navy then it will work for you. Rick

 

You might contact Austel with some of your questions, they might design you a nice alum. boat or give you a good price on an already built ferry that I think was built but never delivered.

 

Sail some boats. Friends/charter, whatever..... A big boat is another beast altogether.
Take your time. Discover your needs versus your wants.
Space and speed are not mutaually exclusive.
Take your time and find a happy medium.
Speed is not the be all and end all.
Happy cruising is.
A boat that does decent speeds with what you want fitted in is the answer.
What you need/ want is the answer.
If cost isn't such a big deal, it really opens your horizons.
Your needs are first. Your wants are second.
Speed is third.

 

Something small enough to handle and care for yourself are the real luxuries of size because then you are independent of personnel schedules and actually spend more time sailing. A large vessel needs more than a captain to keep it sailing. Business manager, banker, boat (ship) yard,, medical.....

 

Ai ai ai
how many factors and complications for a big boat!
Do you thing is realistic to sail a large multihull without crew?
Even if we have a limited experience in sailing, would be possible to learn to sail and operate such a big vessel?
What is the rig more easy to short handle? MastFoil?
mhhhh maybe we go on a dragonfly
for the SOR
cabins needed are not for 30 people,
enough 1 master with head with privacy in the main hull,
4 or 5 in each ama
and another one in the central hull.
in total 4 heads are enough.
No luxury, wood finishing is liked, simple and natural look

ciao
thank you
eiasu

 

Sure you can get by without a crew and without experience ....

Put on life jackets and go for a swim ....

 

Why not get several smaller tri/cats and only use as many as needed at that time... You can race each other and raft up at the end of the day

 

Eiasu.

Thank you for wasting my time.

It was a lesson in your futility.

Regards,

wayne

 

This is a great idea, the surplus boats could then be kept in a charter fleet when not needed to pay their way.

 

that could be a way to confront performance,
hammerhead, dragonfly, corsair, .....

coming back to the lenght /displacement
what does tell this number : Length / Displacement (m/ton):
Ed Horstmann Tri-Star 80 0,43 ?
Of course it's much more heavvy then all the other multihull
in the list, and the value is worst then the Lagoon that
is known for being not performance oriented.
Is the Horstman a sort of motorsailer?


Length / Displacement (m/ton)
Kurt Hughes trimaran 71 1,06
Chris White Hammerhead 54 2,13
Ed Horstmann Tri-Star 80 0,43
Gunboat 78 0,83
Atlantic 57 1,45
Wharram Pahi 63 2,40
Lagoon 620 0,59
Matrix Silouetthe 760 0,58

Sail Area / Displacement (sqm / ton)
Kurt Hughes trimaran 71 8,35
Chris White Hammerhead 54 16,27
Ed Horstmann Tri-Star 80 4,33
Gunboat 78 10,69
Atlantic 57 10,98
Wharram Pahi 63 16,25
Lagoon 620 5,80
Matrix Silouetthe 760 11,65




thank you very much,
ciao
eiasu

p.s. sorry for challenging the patience of many, I know i am unexperiencrd
and i ask wrong questions, hope still somebody is left that can answer me