welding on a steel yacht hull

Originally Posted by tugboat

PDw- thanks- yes I just recieved an email from the NA who did the 25 ft boat- and he is going to supply me with the cnc files inexpensively. There are 10 frames of 3/16th frames. It costs 100.00 per hour to cut the frames, im guess this could be done for around 500.00 much less than if i lofted it out - built sheds, platens etc. -true the platen gets used as hull plating. However my boat has no accomodations. The inside of the pilot house might have some plywood but not much...maybe 3 sheets or so. Yesterday I was travelling for the weekend and saw a 25 ft single chined tug VERY similar to mine-having almost the same proportions and the same bow style. she had plywood doors. the owner uses her to puch barges on a large freshwater lake here. There was a steering wheel., a door a seat some guages/controls/lights and that was it...
I think in todays world- cnc is the way to go. It cuts my construcitons times down and I believe its less expensive overall to go this route.

What about using a level I-beam/s as a jig? then weld tabs on to hold the frames, then brace them in a similar fashion as you did?

Murielle 's concrete probably moved because of the frost line. (my guess)
so ill have to mke sure i foot the sonotubes about four feet in the ground below the frost line. if i go that route..
I think everyone has a different way of erecting the frames. as long as they are erected to the centerline and plumbed they should be good to go...
ill move my posts to my other thread-- so as not to hijack it by accident..

ill start a new thread about building a 25 ft tug...
see you there hopefully...

Oh Mate.........

from 45 to 40, then 25 to 28, then 40 again............

from steel to FC, to FAR, to steel, with some thoughts about other choices...

Ok, that is your way, and for sure it is your right to do it that way.

Just one comment regarding your own @ss:

Do never, never, I mean do not think about it, try to make a stern tow with such a boat!!!!

Pushing is ok, towing on shoulder can be ok, but never do a stern tow!

N E V E R

Even if the boat was designed to do stern towing, the skills needed to survive two jobs, are probably far, far away from yours.
No, no, not hammering on your expertise, just to make sure you survive the first month after launch!
Tugs, Anchor handling vessels, and Icebreakers are not toys, nor yachts. You either know what you are doing, or life will tell you the hard way what you did not!

Print that out and put it under your cushion for a while!

Regards
Richard

[pdwiley]

Originally Posted by apex1

Oh Mate.........

from 45 to 40, then 25 to 28, then 40 again............

from steel to FC, to FAR, to steel, with some thoughts about other choices...

Ok, that is your way, and for sure it is your right to do it that way.

Just one comment regarding your own @ss:

Do never, never, I mean do not think about it, try to make a stern tow with such a boat!!!!

Pushing is ok, towing on shoulder can be ok, but never do a stern tow!

N E V E R

Even if the boat was designed to do stern towing, the skills needed to survive two jobs, are probably far, far away from yours.
No, no, not hammering on your expertise, just to make sure you survive the first month after launch!
Tugs, Anchor handling vessels, and Icebreakers are not toys, nor yachts. You either know what you are doing, or life will tell you the hard way what you did not!

Print that out and put it under your cushion for a while!

Regards
Richard

Skipper I used to sail with managed to pull the shaft out of an anchor handler doing oil rig work. Got a line around the prop. They got the ship to dry dock before it sank though.

He was back to first mate after that one.

PDW

[Bijit Sarkar]

Sorry if I am repeating because i did nt read all the posts.
Please be sure that the cutouts have a rounded corner of 5 to 6" radius. Sharp corners will cause stress concentration and may become starting point of cracks in future.

[Milan]

Originally Posted by apex1

… Do never … a stern tow … skills needed to survive … know what you are doing, or life will tell you the hard way what you did not …

Yes, tugs are speciality apart. It can go wrong even when very experienced professionals are involved.

Last week one tug manoeuvring big cargo ship, capsized in the harbour of Rotterdam. Two lives were lost.

[tugboat]

Originally Posted by apex1

Oh Mate.........

from 45 to 40, then 25 to 28, then 40 again............

from steel to FC, to FAR, to steel, with some thoughts about other choices...

Ok, that is your way, and for sure it is your right to do it that way.


Regards
Richard

Yes Richard it damn well is my right when it is coming to my time and money and I want to make sure i will make the right choice- so yes!! you are correct!! that is my right!

honestly- I really dont care if i change it 100 more times!!- if someone wants to point that out as if there is something wrong in doing that !?--take a guess who's problem it really is?!...print that out also and sit on it...

i dont think its fair to the thread starter to talk about this stuff on this thread...i have another thread you can come and (try to) make me look stupid on but here(this thread) isnt the place...

[tugboat]

Originally Posted by Milan

Yes, tugs are speciality apart. It can go wrong even when very experienced professionals are involved.

Last week one tug manoeuvring big cargo ship, capsized in the harbour of Rotterdam. Two lives were lost.

wow- did they get overtaken by thier tow?
happens a lot--especially if the tow gets abeam of the tug. was it towing it astern? or was she assisting? when towing astern thats very dangerous since you can't cut the towline- and if you could release it instantly the rebound would kill you.throw you overboard, capsize you or both-
the way to handle that would be full astern backing into the tow...after a certain point --youve lost her--and its all up to the forces at play whether you survive. if the tow is bigger/heavier than the vessel--its not pretty

NB: life is a risk no matter what you do--there are no guarantess in anything we do- so we can sit in a bubble and not try anything for fear of dying or we can live--and when our number is up--then its time to go...
I feel sorry for the families of that crew...