Boat in build pics (Squadron 78)

[MapisM]

The compartment does not have to be much bigger than the assy itself

Oh yes, it does! If you want it to be really safe, that is.
Which is the reason why I previously said it ain't trivial. I've seen pics of the internal damage made by a stab shaft which hit a container on a steel trawler cruising at 8kts and trust me, you wouldn't want to test those w/t comps in a similar situation. Not at 8kts, I mean - let alone at 25+...!
I'm not saying they're useless, of course. In the event of a minor damage which creates a small leak, they surely do their job, judging by those pics. But that's a situation also bilge pumps should be able to cope with.
Anyway, all considered, I agree with you that it's worth having at least something like that, and that it's not such a big deal if included in hull design from the start.
Though I'd still prefer to have also a proper w/tight mid section of the whole boat, with a full bulkhead between the master cabin and the forward cabins, particularly on such fast boats with fin stabs.

 

[MapisM]

That's some gear indeed.
Just curious, do those windlasses allow a free release of the chain?
I've only seen that on horizontal models so far - which is one of the reasons why I prefer them.
I see the brake wheels on those, but can't understand if they also have the friction release somewhere.

PS: I must say that I'm with Deleted User on the "downsizing" of one anchor. Each to their own, but imho if you follow the "2 better than 1" principle (which I agree with), you should go all the way - same anchor and chain size/length.

 

[MapisM]

Not weird. There is a linkage mechanism inside the door, so all three catches move using the handle on either side of the door. Nice job

Aha. Sorry J, at first glance I didn't notice that the two catches on top and bottom are just catches and not handles, so I assumed that each had to be closed manually - hence only from the e/r side.
Yup, nice job. Who builds them?

 

[petem]

If I understand it right the (foam outer) fin breaks away in the event of an impact leaving a smaller inner solid section. Could this be designed to break away too a la IPS?

 

[STEVEDUNSTABLE]

Update: It was loaded onto a truck 9-10am this morning and left Oundle, headed for Ipswich. About 80miles I think, and journey takes 2 days (they go with police and have to dismantle street furniture as they go!). Despite the snow, the trucking firm and police are happy that the trip can be done. It should get to Fairline's Ipswich base tomorrow (Friday) mid afternoon, and it will get assembled over the weekend (rudders, props, radar mast etc) then launched Monday

A few pics follow. Not much ground clearance for the truck! I wasn't there; these pics were kindly sent to me by Fairline

hi JFM...very sorry if this has been covered before BUT... looking at the stab arm on the "trailer pic", it appears to be about 17/20degs off the vertical. does this not add to the "rudder" effect or are the blades a special shape to stablize ONLY........also what, approx, will the gross weight be with fuel and water etc..........thanks for the thread n GOOD CRUISING

 

[jfm]

That's some gear indeed.
Just curious, do those windlasses allow a free release of the chain?
I've only seen that on horizontal models so far - which is one of the reasons why I prefer them.

It is indeed lovely gear. Yes Mapis, there is a cone clutch in all these Lewmar models. You back off the nut on the top of the capstan using a winch handle, and the gypsy then spins freely, dropping the chain

 

[jfm]

hi JFM...very sorry if this has been covered before BUT... looking at the stab arm on the "trailer pic", it appears to be about 17/20degs off the vertical. does this not add to the "rudder" effect or are the blades a special shape to stablize ONLY........also what, approx, will the gross weight be with fuel and water etc..........thanks for the thread n GOOD CRUISING

It's normal to have them like that steve. Nearly all stabilised boats you'll ever see have them off the vertical. They produce a torsional force on the hull to eliminate rolling, and to do that it doesn't much matter what the angle is. Also, having the shafts perpendicular to the hull surface means there is only a tiny gap at the top twixt hull and fin, and that reduces vortexes and so it makes the fins more effective for a given size. On the bottom edge there are winglets to reduce vortexes

I'm not sure what you mean by "rudder effect". The vertical component of the fin will always produce a sideways force on the hull but it should not induce turning because it is mid ships, unlike the rudders which are aft of the boat's centre of resistance

One of the problems you can get on a fast boat is that the horizontal component of the fin surface can produce lift forces on the hull. That's not a problem is they are positioned correctly (ie aft ish, as per my and MYAG's boat). But if you position them too far forward it makes the boat ride bow high, which is a BIG problem that Princess have had with the stabilisers on their new 72 flybridge.

 

[jfm]

If I understand it right the (foam outer) fin breaks away in the event of an impact leaving a smaller inner solid section. Could this be designed to break away too a la IPS?

That's right Pete and if you're lucky that will be the only damage. But of course if you hit something too big then the soft part aint gonna save you and the whole shaft can rip a hole in the hull. That would take one hell of a clout and I'd expect the shaft (dia 65mm) to bend before the panel rips out of the hull (though I haven't done the FEA to prove that!). But it would be the same if you hit a big object with shaft/rudder/P bracket

We're talking pretty unlikely here. I will have a selection of liferafts and tenders to get into if this happens, and Mr Pantaenius will buy me a new boat

I doubt it is feasible to build in any further breakaway section a la IPS

 

[MikeJ42]

This might be a silly/ignorant question. But I have to ask as I am intrigued, why have you got stabilizers on a boat that has dynamic stability by virtue of its hull design (speed)? I previously thought they were for displacement boats only.

I only have a little 42ft flybridge but I cant think of many times I would have needed them. Praps big boats are different? I assume this decision is based on experience?

 

[STEVEDUNSTABLE]

It's normal to have them like that steve. Nearly all stabilised boats you'll ever see have them off the vertical. They produce a torsional force on the hull to eliminate rolling, and to do that it doesn't much matter what the angle is. Also, having the shafts perpendicular to the hull surface means there is only a tiny gap at the top twixt hull and fin, and that reduces vortexes and so it makes the fins more effective for a given size. On the bottom edge there are winglets to reduce vortexes

I'm not sure what you mean by "rudder effect". The vertical component of the fin will always produce a sideways force on the hull but it should not induce turning because it is mid ships, unlike the rudders which are aft of the boat's centre of resistance

One of the problems you can get on a fast boat is that the horizontal component of the fin surface can produce lift forces on the hull. That's not a problem is they are positioned correctly (ie aft ish, as per my and MYAG's boat). But if you position them too far forward it makes the boat ride bow high, which is a BIG problem that Princess have had with the stabilisers on their new 72 flybridge.

thanks for that reply..in MY IGNORENCE i justed assumed that they would have to be set much nearer to the horizontal....(yes i was thinking of the sideways force eg. rudder push)...again thanks...FAB vessel !!!!!.............yes JEALOUSY GREEN is my natural colour !!!!

 

[jfm]

MikeJ42, reasons are: (a) In some seas, a boat with dynamic stability can still roll, eg beam on to a big swell (b) I go at slow speeds quite a lot (c) they are zero-speed stabs, so they work at anchor. (b) and (c) are the main reasons, not (a).

(Also, I like gadgets as does MYAG )

 

[rafiki_]

JFM

I assume your gorgeous boat will be outside in the water at LIBS? Apologies if this has been covered before.

 

[jfm]

JFM

I assume your gorgeous boat will be outside in the water at LIBS? Apologies if this has been covered before.

No, it'll be inside in the warmth as will MYAG's. Last year even the sunseeker Pred 108 was inside. you have to be bigger than 110 to need to go outside

 

[PaulGooch]

It is indeed lovely gear. Yes Mapis, there is a cone clutch in all these Lewmar models. You back off the nut on the top of the capstan using a winch handle, and the gypsy then spins freely, dropping the chain

Same with the vertical Lofrans.

 

[jfm]

Fairline just sent me a few pics of the finished job. I'm really pleased with the interior finished look (it will have bright coloured cushions when done, but you get the idea)

 

[rafiki_]

I'm looking forward to seeing her. I hope the carpet is capable of absorbing the expecteration!!

 

[Alistairr]

Fantastic jfm.
What is the thing on the counter down the bottom right of the second last pic?
The wall art looks fab, and your use of floor, panel and counter colours make the whole lot look stunning.

Can't wait to see it too.
Cheers.
Al.

 

[Elessar]

hadn't appreciated the geography of the accommodation stairs and fly stairs. Fab.

Is that a pot noodle in the galley??

 

[ACE]

WoW absolutely Stunning.... Cant wait to see her !

 

[jfm]

What is the thing on the counter down the bottom right of the second last pic?

It's the control screen for Beosound 5, Al. http://www.bang-olufsen.com/beosound5