another idiot with mad ideas, new boat build

grumpy_o_g said:
I think it's absolutely bloody gorgeous especially in the profile. I can easily understand why you want to do it yourself after seeing how you turned your current boat into what you wanted. Stupid question but how do you fix stuff non-metal stuff to the inside of a steel hull?
Click to expand...

there are steel stringers and supports every three foot or so that can be fixed to. ill dig a photo out.

dsc05498.jpg


this chap has a blog site from building a 50 footer. he has a single screw 220hp iveco NEF
http://dbdream.files.wordpress.com

its in dutch, but google can sort that :)
 
please dont get hung up on the 380 horses.
if in future i think it needs more, it will get them. I have bought these engines at the right price, and if in time percieve they need to be be bigger, will get swapped.
they have saved me over 40k on new. that nearly pays for the hull alone. And if I dont go with this, they will go in my current boat. 40 knot 30 year old seeker, that doesnt smoke 20 woodbine an hour :)
 
Robg71 said:
please dont get hung up on the 380 horses.
if in future i think it needs more, it will get them. I have bought these engines at the right price, and if in time percieve they need to be be bigger, will get swapped.
they have saved me over 40k on new. that nearly pays for the hull alone. And if I dont go with this, they will go in my current boat. 40 knot 30 year old seeker, that doesnt smoke 20 woodbine an hour :)
Click to expand...


This could be one hell of a project, whichever route you take:cool:.....Good luck, Rob.
 
I have lots to do and think about, that's for sure.
I love the uncluttered lines, and it's a fair blank canvas.
I have a list a mile long of stuff to sort out.
That's before even looking at major design areas and floor plans
 
Think you are on the correct track.

There is no significant weight delta between GRP and steel, the weight is in the fit out. I would set a wight target of around 24 tonnes which should be easily achieveable.

At 24 tonnes twin 380's sound about right.
 
I believe its hardware. as the original boat these were in had them pulled out and swapped for a pair of 480's
that thought already crossed my mind. not sure whats different. may not be much, but I doubt it would be otherwise original owner would possibly have gone down that route.
 
burgundyben said:
Am I right in thinking those 380's are firmware only to upgrade to 480?
Click to expand...
Friad not Ben, one CPL for 225 and ratings in between to 380, onother CPL from 425 to 480, list of hardware differences is a long one. If you are thinking about Miss Daisy, engines were uprated by Cummins factory, mixing CPL's is dangerous game, two bits actually touch if up these two CPL's are mixed up by people not in the know.

Matching power and torque curve of Napier 24 liter aero engine with a Cummins 6.7 diesel was challenging, until we discovered that injectors from 9 liter go straight into 6.7 head, now we are ready for a scrap with guy who has put automotive version Rolls Royce Merlin into 8 liter Bently chassis.
 
Latestarter1 said:
Friad not Ben, one CPL for 225 and ratings in between to 380, onother CPL from 425 to 480, list of hardware differences is a long one. If you are thinking about Miss Daisy, engines were uprated by Cummins factory, mixing CPL's is dangerous game, two bits actually touch if up these two CPL's are mixed up by people not in the know.

Matching power and torque curve of Napier 24 liter aero engine with a Cummins 6.7 diesel was challenging, until we discovered that injectors from 9 liter go straight into 6.7 head, now we are ready for a scrap with guy who has put automotive version Rolls Royce Merlin into 8 liter Bently chassis.
Click to expand...

Ah, ok, thought it was code only, suspect 380 is a sweet spot for the QSB.
 
Lovely looking vessel, but I'm a bit surprised at its weight. We have a 38' steel ketch which weighs in at a shade under 18 tonnes, considerably smaller than yours and with only one comparitively small engine. what thickness steel are they using?
 
Latestarter1 said:
Think you are on the correct track.

There is no significant weight delta between GRP and steel, the weight is in the fit out. I would set a wight target of around 24 tonnes which should be easily achieveable.

At 24 tonnes twin 380's sound about right.
Click to expand...
Mmm... While I agree that the fit out also affects the total weight, I wouldn't dismiss the difference between GRP and steel as non significant.
There are plastic 50' footers whose dry weight is below the 20T mark, even with bigger engines.
Anyway, also accepting that 24T dry weight is achievable with a light steel hull, I still think that it would take more than 2x380 to push her at 22kts when loaded.
After all, even if the hull looks nearer to a P than to a D design, it surely doesn't seem optimised for speed...
 
I have just got off the phone to the designer this afternoon. The new design is around 30% more efficient than this. Currently has the 50 footer in 3d cad, which will filter down to the 46 and the 40.
Even at 20 knots, for a boat thats size & design i think is enough. we will see. what ever figures I bandy around are not gospel until after I have had a good chat with him.
The next boat on the slip for them in holland is a fifty footer, so I can go across and have a good look around and see. All fully coded work to IIRC Lloyds.
I am meeting him next week, but hopefully he will be emailing more details tomorrow, but could be some of the old design specs etc for food for thought.

Im am looking forward to getting my teeth in to this :)
 
Robg71 said:
I have just got off the phone to the designer this afternoon. The new design is around 30% more efficient than this. Currently has the 50 footer in 3d cad, which will filter down to the 46 and the 40.
Even at 20 knots, for a boat thats size & design i think is enough. we will see. what ever figures I bandy around are not gospel until after I have had a good chat with him.
The next boat on the slip for them in holland is a fifty footer, so I can go across and have a good look around and see. All fully coded work to IIRC Lloyds.
I am meeting him next week, but hopefully he will be emailing more details tomorrow, but could be some of the old design specs etc for food for thought.

Im am looking forward to getting my teeth in to this :)
Click to expand...

Caveat: suggest you lodge build money in a solicitors escrow account......just in case, don't give deposit money directly to boat builder...........


I have just got off the phone to the designer this afternoon. The new design is around 30% more efficient than this.
Click to expand...

...perpetual motion?:confused:
 
Last edited:
Please don't talk about it any more. Just that photo is inspiring. I built a kit car 25 years ago and have renovated several houses. I'm worried if I read more on this I will find myself dragged into a wonderful project myself. I have to resist (go on go on, more, more, more)
Robg71 said:
there are steel stringers and supports every three foot or so that can be fixed to. ill dig a photo out.

dsc05498.jpg


this chap has a blog site from building a 50 footer. he has a single screw 220hp iveco NEF
http://dbdream.files.wordpress.com

its in dutch, but google can sort that :)
Click to expand...
 
You must log in or register to reply here.

Other threads that may be of interest

O
“The Dog that Didn’t Bark:” Yanmar. 4L HASTE.
Replies
2
Views
283
oldgit
O

Share this page

Top