New Boat, Swedish Delta "Yacht" - anyone got any info? Jack?

MapisM said:
Interesting stuff, thanks for the link.
There's something to be said about the fuel burn comparisons, but I'll stay out of that.
Otoh, the planing attitude is indeed impressive.
I'm wondering how (little?) loaded the boat was, when the video was taken.
Anyway, the 45 tons mentioned in the video are also very impressive for the size.
Though that's with empty tanks, surely?
Maybe Lars can throw some light on that...
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MapisM, I believe (from info sent by delta) the fuel figures are 47.5tonnes. Bareboat, ~50% fuel, 3 people, not much water = 47.5 tonnes. Cold air (so engines breathing dense air). Still these are very impressive figures
 
jfm said:
MapisM, I believe (from info sent by delta) the fuel figures are 47.5tonnes. Bareboat, ~50% fuel, 3 people, not much water = 47.5 tonnes. Cold air (so engines breathing dense air). Still these are very impressive figures
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Jfm, what is Match2's equivalently-loaded weight, by comparison?

Cheers
Jimmy
 
Designo said:
5. The port side box is the staircase down as you said and the starboard is storage, also with a pantograph door. Both cubes are to carry and to stabilize the flybridge so it doesn't flex sideways.
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Thanks. So is the staircase inside the cube, down to the crew cabins, a kind of vertical ladder or is it a true staircase? I'm just trying to figure out the use of space, from the limited plan drawings available on the internet...

What's inside the wooden cabinets inside the saloon, immediately in front of the two "cubes" - the little cabinets with the table lights on top of them. Does the port side one create headroom clearance for the staircase?
 
Designo said:
I must have slept over that math lesson... About the Seakeeper, I have not tried it out on the D80 so I can not say if one is enough, but two are too heavy I think. Anyway, the gyro is only for zero or low speed. For high speed we have the Humphree interceptors.
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I'm perplexed by the "math lesson" comment! Are you serious? Do you not have calculations of angular inertia?

Also how can an extra seakeeper be "too heavy?" It's something like 500kg but that is the difference of 60 miles worth of fuel even in your super efficient machine, or the difference in water load in the morning versus the evening, or 6 people, etc. It feels insignificant, compared with having a comfortable day on a €5m boat...

If a customer wanted say 3 tonnes of customisation, would that be a big "No" from Delta? Assuming the customer doesn't care if it does 34 knots versus 37

As for humphrees, they are no substitute for fins (or 2 x seakeepers)!
 
JFM, what is a humphree?

Ignore, I now know they are interceptors, dynamic ones. I cannot see how these would achieve anything like the stability underway of a good fin system and they definitely wouldn't work in a STAR way.
 
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jfm said:
In fact, IIRC, a lot of trawler manufacturers like you to put a heavy tender high up on the flybridge for this exact reason. (Sure that increase CoG, but that's another thing altogether, and there are always pros and cons!)
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Yup, thats why modern Nordhavn superstructures are usually v high. They believe that a longer, slower roll period is more comfortable than a short, snappy one, obviously within the limitations of appropriate stability requirements. Agree with Mapism, what you're describing is what I would think of as not stiff
 
jfm said:
Thanks. So is the staircase inside the cube, down to the crew cabins, a kind of vertical ladder or is it a true staircase? I'm just trying to figure out the use of space, from the limited plan drawings available on the internet...

What's inside the wooden cabinets inside the saloon, immediately in front of the two "cubes" - the little cabinets with the table lights on top of them. Does the port side one create headroom clearance for the staircase?
Click to expand...

The stair is more like a ladder and behind it is the crew shower. The cubes are just storage for small things and electric outlets...

Crew stair.jpg
 
jimmy_the_builder said:
Jfm, what is Match2's equivalently-loaded weight, by comparison?

Cheers
Jimmy
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About 52 tonnes light, but that includes tender and gear. The equivalent for Delta 80 (from some data they sent me) is 44 tonnes. Then on the Sq 78 you can add (up to) 8 tonnes of water and fuel, if you choose to fill it, and say a tonne of people, so you get to 61 tonnes

If you are reconciling the empty boat figures, Sq78 52 tonnes and Delta 44 tonnes, the maths must go something like this:

Engines/shafts/boxes (Sq78 = 8 tonnes, D8 = 6.9 tonnes) 1.5
Stabilisation gear my fins vs 1 seakeeper 0
Gensets 0
Thrusters and hydraulics 0.5
Heavier furniture/fitout on Sq78 (guess) 2
Bigger flybridge deck (guess) 1
Lighter hull/carbon/infused 3

But there is much guess work in that...
 
wakeup said:
JFM, what is a humphree?

Ignore, I now know they are interceptors, dynamic ones. I cannot see how these would achieve anything like the stability underway of a good fin system and they definitely wouldn't work in a STAR way.
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They are not meant to work as STAR - the seakeeper does that. They do create some antiroll, provided you are going fast like 30 knots+. If you are doing 20 knots in big seas, they wont stop you rolling like a pig! I don't know their reaction time as compared with fins that do 90 degrees per second. Humphree do not publish much data, and to be fair to them, they do not market them as an all singing/dancing alternative to fins
 
Designo said:
The stair is more like a ladder and behind it is the crew shower. The cubes are just storage for small things and electric outlets...

View attachment 38041
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Thanks. Can you make it proper stairs, eg by using the saloon cube (with the grey table light on it) as a hollow space to create headroom? I'm not sure I fancy lugging oil drums and such like up/down a ladder!
 
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Designo said:
Yes, and with a similar ladder from the deck.
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jfm said:
Thanks. Can you make it proper stairs, eg by using the saloon cube (with the grey table light on it) as a hollow space to create headroom? I'm not sure I fancy lugging oil drums and such like up/down a ladder!
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Sounds like you'd have to carry heavy 'stuff' down the ladder from the crew's quarters to the engine room regardless if you could redesign the first ladder into stairs.
 
KevB said:
Sounds like you'd have to carry heavy 'stuff' down the ladder from the crew's quarters to the engine room regardless if you could redesign the first ladder into stairs.
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I don't think so. I think that in hull #1 there is a ladder down from aft deck to e/room, plus a ladder down the C pillar "cube" down to the crew quarters and then a door to the e/room. E/room and crew quarters are on same level - no stairs or ladders twixt the two. So if you had the staircase I'm asking about, you could carry heavy stuff down that, then walk thru a door to the e/room. I think...

It's not just oil and stuff that has to go up/down to the crew space. It's all the laundry, which is a big deal in a boat with 8 guests and two crew all summer long
 
jfm said:
I don't think so. I think that in hull #1 there is a ladder down from aft deck to e/room, plus a ladder down the C pillar "cube" down to the crew quarters and then a door to the e/room. E/room and crew quarters are on same level - no stairs or ladders twixt the two. So if you had the staircase I'm asking about, you could carry heavy stuff down that, then walk thru a door to the e/room. I think...

It's not just oil and stuff that has to go up/down to the crew space. It's all the laundry, which is a big deal in a boat with 8 guests and two crew all summer long
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The deck hatch is the easy way to get things to the engine room. The laundry is between the guest cabins, not in the crew cabins.
 
jfm said:
I don't think so. I think that in hull #1 there is a ladder down from aft deck to e/room, plus a ladder down the C pillar "cube" down to the crew quarters and then a door to the e/room. E/room and crew quarters are on same level - no stairs or ladders twixt the two. So if you had the staircase I'm asking about, you could carry heavy stuff down that, then walk thru a door to the e/room. I think...

It's not just oil and stuff that has to go up/down to the crew space. It's all the laundry, which is a big deal in a boat with 8 guests and two crew all summer long
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From the previous reply I took it there were more stairs from crew to engine room.

Saw this whilst browsing. Has a flybridge more akin to what would suite the delta

Nauta-Air-80-superyacht-on-which-motor-yacht-Nauta-Air-86-is-based-665x265.jpg
 
I saw that the other day whilst mooching about.

First one in build by CDM. Aluminium with single engine, 18 knots from what I read on tinternet. Also see the tender is up top with a jacuzzi too. Can you get waterproof scatter cushions? :D:D:D
 
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