Artemisia - new build thread for a Prestige 680

[Deleted User YDKXO]

But if you look at boats like the F630 or the P67 (just to make a couple of familiar examples... ), in both of them the V shape of the hull continues above the w/l, approximately with the same angle, up to the deck level.

Nah, can't speak for the P67 but the F630 isn't like that. The fullness of the hull is carried quite well forward similar to the P680. Having said that IMHO there are other factors which affect head sea performance such as running trim, weight distribution and overall weight so only a seatrial in marginal conditions is going to tell how good the P680 is in a head sea. One thing I do wonder about is this; planing flybridge boats are getting lighter due to more efficient production methods but at the same time wider and higher. How does this affect their seakindliness?

 

[MapisM]

The fullness of the hull is carried quite well forward similar to the P680.

Maybe we are a bit at cross-purposes, M.
By V shape continuing above the w/l, I didn't mean the side sections of the hull, but I was referring specifically to the stem - if that's the correct wording.
In fact, I mostly heard it used for wooden boats, where it's a sort of continuation of the keel and it's an important structural part. But you see what I mean, anyway.
It's the stem that in the P680 seems to almost disappear, making that hull section much more round (if not almost flat) compared to most other P hulls.
I agree that the hull max beam is extended as much forward as possible in most modern P boats (with the exception of superfast stuff) to gain internal volumes, and that in this respect the Prestige doesn't look much different than your or most other P boats.
But the stem, with its angle (very narrow in D boats, much less so in most P boats, but almost non-existent in the P680), is what hits/cuts the water first, hence is bound to make some difference in itself, methink.

I also agree that trim, weight balance and total displacement are other important factors.
My reasoning was just on the pointy bit AOTBE, so to speak - though obviously there isn't such thing as the very same boat with two different stem/bow shapes...

 

[Portofino]

I think they call it "Carolina flare" it's seen on some Eu boats and North American stuff like Lurhs -- for as MapishM infers ,
If I understand him correctly ,in a chop the bow due to the concave nature above the WL defects waves and try's to float over as the V below parts the sea = less bounce smother ride .Also the waves deflect away and do not get blown back over the boat = dry ride .
Some old school IT boats -arguably focused on speed still do this .But with the P680 ,the fwd owners area ,it's USP ( and a great design BTW ) has to comprimise this , in fact most mainstream are at it .
Here's some pics -paint a1000 words

You can see the concave hull shape above the chine .

Water defecting -not blowing over .-bow floating over not digging in ( this is a 40 not a 48 -same )

Sunseeker Hatten 50 left and my first MoBo SS Portofino 35 @ factory finishing - here you can see where the builder has tried to max out the bow volume

 

[Portofino]

I find big duo prop boats also tend to have a shallow dead rise at the stern ,to get lift .They all do it these days -builders .
How ever the bow V on the P680 does looks nice and sharp and has 68 ft to flatten ,which it does .
It as the same size engines more / less as my 48 ft - but in IPs
But as the Op said it a fair weather boat cum floating appartment with mostly just a couple on board ,
Fit out /comfort / space / pleasure etc -ie how it will be used - 90 % or the time ---it bang on the Money and Jeaneau will
sell many .Here in the SoF ,iam surrounded by Jeaneau ,French understandably are v loyal to there own .
Thx for sharing the build

 

[MapisM]

Here's some pics -paint a1000 words

I didn't want to expand this point (all considered very minor, for a P boat aimed at fair weather cruising) further, but along the lines of a pic is worth a thousand words, checkout these bows.
No prize for guessing which hull style will provide a smoother ride in rough sea...

 

[MAFWeiss]

I didn't want to expand this point (all considered very minor, for a P boat aimed at fair weather cruising) further, but along the lines of a pic is worth a thousand words, checkout these bows.
No prize for guessing which hull style will provide a smoother ride in rough sea...

Exactly! The wife and I are definitely 'home on the water' fair-weather cruiser's. First sign of nasty weather we are heading straight for the nearest shelter!

 

[MapisM]

Absolutely nothing wrong with that!
You can count also myself in the club of boaters that, having the opportunity to spend a lot of time onboard, can pick the best weather for cruising and enjoy land life during the others.
We don't call it PLEASURE boating for nothing, after all... :encouragement:

 

[Portofino]

They do the Carolina flare lower down ,in fact pretty keen exponents of it , if not the best builder using it ?

Cap Camarant range -v popular

Not sure what this is ? 500 or 550 ? -
So it's a totally new Hull design concept the bigger Prestige range .,guess targeting a different set of buyer with Different set of priorities ?
I think they have got it right the fwd master suite in the P680 is game changer, I like the cantilevered HT too -nice touch .

 

[Deleted User YDKXO]

Maybe we are a bit at cross-purposes, M.
By V shape continuing above the w/l, I didn't mean the side sections of the hull, but I was referring specifically to the stem - if that's the correct wording..

OK understood now but I don't know how much difference that really makes. Also I don't think comparisons with SD boats are entirely valid. By definition, planing hulls are designed to provide lift in order to allow speeds in excess of 20kts so the part of the hull which is in contact with the water in a head sea situation is further aft compared to a SD boat. Yes if you want a softer ride into a head sea then buy a SD or D boat but then don't expect to cruise at more than 12-15kts

 

[dme]

Re Dishwasher.

John is more than right, 45 cm may be ok when you are old and knackered, boatless, and living in a studio on your own, but not for the real world. Bigger, faster most professional i.e. the Miele is what is required.

Likewise on the washing machine front. Washer dryer is no good. You will end up sending the laundry out and then it will go missing!

I speak from experience. The other technical stuff I will leave to those more qualified.

Looks great

Diana

 

[westernman]

I live in a 3 story house in the south of France with air conditioning in all rooms, the usual Nespresso machines, 52in TVs, electric kettles, ovens etc.

Our house is limited to 6KW and we have never tripped the supply.

Why do you need a 22.5KW generator in a boat? Ok it is a big boat, but still a lot smaller than my house.

Looks nice by the way.....

Can some one explain this to me?

 

[MapisM]

Also I don't think comparisons with SD boats are entirely valid. By definition, planing hulls are designed to provide lift in order to allow speeds in excess of 20kts so the part of the hull which is in contact with the water in a head sea situation is further aft compared to a SD boat

Agreed, but only as long as you think of a P boat cruising at P speed.
Which is very sensible, mind - and probably valid for 99% of the occasions when the OP will enjoy his new boat!
But the scenario I had in mind is the one I mentioned in post #60, when talking of the round hull around the stem section: that shouldn't make any difference as long as the sea conditions allow cruising at planing speed, but at D speed, when occasionally the whole bow hit green water, I would expect the slamming to be noticeably higher.
And whenever forced to slow down to D speed, the entry point in the water is obviously the same for any kind of hull...

 

[Deleted User YDKXO]

But the scenario I had in mind is the one I mentioned in post #60, when talking of the round hull around the stem section: that shouldn't make any difference as long as the sea conditions allow cruising at planing speed, but at D speed, when occasionally the whole bow hit green water, I would expect the slamming to be noticeably higher.
And whenever forced to slow down to D speed, the entry point in the water is obviously the same for any kind of hull...

All agreed

 

[MAFWeiss]

Re Dishwasher.

John is more than right, 45 cm may be ok when you are old and knackered, boatless, and living in a studio on your own, but not for the real world. Bigger, faster most professional i.e. the Miele is what is required.

Likewise on the washing machine front. Washer dryer is no good. You will end up sending the laundry out and then it will go missing!

I speak from experience. The other technical stuff I will leave to those more qualified.

Looks great

Diana

Thanx Diana, but it is what it is. There is no room for a larger dishwasher, nor a seperate spin dryer. We are not bothered at all, since we managed quite happily on our other boat with an even smaller dishwasher and we rarely spin dry, as with the sun and heat in south Italy things dry very quickly hung up outside.

 

[Cashbuyer]

You were mentioning the flooring and rugs/carpet. I think what Prestige are showing here looks great. And if you get bored with it or it's not practical then just pull it up. I think It would be good to 'soften' that area. You'll have a lot of wood floor...

http://static.boatadvice.com.au/wp-content/uploads/2015/08/Prestige-680-3.jpg

How exciting for you. Good luck.

 

[Piers]

Can some one explain this to me?

Lmited to 6kW? Really? In terms of Play d'eau, that's just enough for 1 x 3kW kettle and 1 x 2kW Immersion kettle with just enough for the battery chargher when using lighting. Are you absolutely certain it's only 6kW?

 

[vas]

Can some one explain this to me?

your home is ON the grid and in terms of Vol of air in it it's probably 3X that of the equiv. floor area of a boat.
Hence, you don't need the 70-100A charging the batteries in a few hours when on the grid (or via genny when at anchor) air-con loads are MUCH smaller, no need for a watermaker AAAND you probably use gas for various things.
From my experience living in a 250sqm two.five storey detached house on the grid with gas hob and CH, I don't think I get over the 7KW EVER
Boat otoh is only 43ft i.e. max 30sqm and has an 8KW genny but could probably do with a 5kW, makes absolute sense

cheers

V.

PS. nice built thread and very nice boat MAFWeiss. My cousin next door was baptized Artemisia, we now call her Artemis (goddess of hunting, wildlife and protector of young girls in Greek mythology apparently)

 

[Piers]

your home is ON the grid and in terms of Vol of air in it it's probably 3X that of the equiv. floor area of a boat.
Hence, you don't need the 70-100A charging the batteries in a few hours when on the grid (or via genny when at anchor) air-con loads are MUCH smaller, no need for a watermaker AAAND you probably use gas for various things.
From my experience living in a 250sqm two.five storey detached house on the grid with gas hob and CH, I don't think I get over the 7KW EVER
Boat otoh is only 43ft i.e. max 30sqm and has an 8KW genny but could probably do with a 5kW, makes absolute sense

cheers

V.

PS. nice built thread and very nice boat MAFWeiss. My cousin next door was baptized Artemisia, we now call her Artemis (goddess of hunting, wildlife and protector of young girls in Greek mythology apparently)

Play d'eau has 2 gen sets. 1x13.5kW and 1x7.5kW = 21kW. When running Air Con I need both sets running if we cook at the same time and often have to turn the water heater off to prevent one of them from shutting down.

So the power hungry items would typically be Air Con; Water heater; Oven; Hob; Battery Charger; Washing Machine; Tumble dryer; Grills, etc, etc, not to mention stabilisation if it's electrically powered.

 

[westernman]

your home is ON the grid and in terms of Vol of air in it it's probably 3X that of the equiv. floor area of a boat.
Hence, you don't need the 70-100A charging the batteries in a few hours when on the grid (or via genny when at anchor) air-con loads are MUCH smaller, no need for a watermaker AAAND you probably use gas for various things.
From my experience living in a 250sqm two.five storey detached house on the grid with gas hob and CH, I don't think I get over the 7KW EVER
Boat otoh is only 43ft i.e. max 30sqm and has an 8KW genny but could probably do with a 5kW, makes absolute sense

cheers

V.

PS. nice built thread and very nice boat MAFWeiss. My cousin next door was baptized Artemisia, we now call her Artemis (goddess of hunting, wildlife and protector of young girls in Greek mythology apparently)

Why in a much bigger house would air conditioning loads be much smaller???
No gas. True about the water maker and battery charging though.

 

[jfm]

Can some one explain this to me?

explanation is that 6kw for a whole house is exceptionally small. You can't use it as a data point in specifying another house or boat. Indeed, are you sure about the 6kva? Thats about 24 amps.