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Author Topic: Any of you guys with any boatbuilding experience here?  (Read 2520 times)
Red
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« on: Wed 6 August, 2008 - 04:56 pm »

I'm taking the diesel motor out of my boat and I'm going to fit a 200hp outboard to it. I am going to build a pod out of either aluminium or ply, and glass it over. What are your suggestions? The reason I'm doing this is
A) to give me more room in the cockpit, and,
B) the diesel that's in it at present will only give me 15 knots and is very heavy and buggers up the weight distribution in the boat. With the increased price of diesel, I can't see much point in spending what I would need to spend on a new diesel with suitable horsepower so the outboard is the cheaper, and I think better option for me. The diesel is also very noisy when underway and an outboard will help there too.

Any idea of the best, and easiest ways to strengthen the transom so the extra weight out the back (it will probably have to protrude about 750 to accommodate the motor when its up)

The engine I'm taking out is over 500kg, with the leg, and the new motor will be around 200kg, but because of the way it will be mounted, there will be a tremendous amount of stress put on the transom.

There are 2 very heavy bearers for the inboard, would it pay to tie it into these somehow, or will I get away with just putting a big plate inside the transom?

It is an older fibreglass boat and has a very strong, thick transom but I don't want anything to move or crack.
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dab
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« Reply #1 on: Wed 6 August, 2008 - 05:02 pm »

i built a model of the Bismarck when i was about 7...i still have the scar on my hand from the scalpel...it's a reminder that i'm not left handed.  eek

anyway, sounds to me like it's a job for a professional boat builder/engineer?




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Red
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« Reply #2 on: Wed 6 August, 2008 - 06:05 pm »

Thank Dab.

Engineering's my trade so I'm not worried about building the pod,  If I do it, it will probably be in aluminium, if I don't have a timber one made.

What concerns me is what is going to happen with the trim, and where to stiffen the hull.
Working with a (very) limited budget so a boatbuilders out of the question at the moment.

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dab
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« Reply #3 on: Wed 6 August, 2008 - 06:09 pm »

ahh, yes, i was wondering about trim too.

i used to do some work for a guy who used to make these awesome ally boats...big f**kers, mostly cats.

he had a great programme which he designed the boats on and it would calculate the weight to nearly a bloody oz. it also did trim etc..

i guess the outboard has an angle setting on it? does your boat have trim tabs?
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Red
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« Reply #4 on: Wed 6 August, 2008 - 06:12 pm »

Not at this stage but I could easily fit them. I think it will be a case of trial and error to a large degree.

I'm not sure what will happen, I'm guessing that the redution in weight will balance out the positioning of the new motor.
Well that's what I'm hoping anyway.
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dab
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« Reply #5 on: Wed 6 August, 2008 - 06:32 pm »

well, i'm no engineer. but to me, an inboard prolly weighs more than an outboard? but then yor movin that weight back...so,,umm...f**ked if i know. best you ignore me 
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Red
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« Reply #6 on: Thu 7 August, 2008 - 09:04 am »

just think of it as a 7 metre surfboard.   
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Weevilgenius
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« Reply #7 on: Thu 7 August, 2008 - 07:58 pm »

can you post pics/drawings of what you plan? 200kgs is not much but I need to see what's what to help.

signed:

snowpee   officially resigned superyacht designer woof**kinghoo!
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The Schizzle
Red
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« Reply #8 on: Fri 8 August, 2008 - 09:26 am »




Thanks Snowpee,  hope this helps.

If I were to do it in timber, I would probably extend the hull by about 900mm and make kind of a Portofino type stern, and incorporate a landing platform on either side of the outboard.  In Aluminium it would be a simple pod.

I guess the centre of the diesel motor that's in it at the moment is about 1200mm forward from where the centre of the outboard will be.

The diesel motor weighs around 460kg, and the stern drive would be another 80kg I guess. The outboard motor will weigh approximately 180kg all up.

The fuel tank is currently forward and only about 100 litres, so I would put another tank under the floor where the engine bay was. Probably another 200 litres.
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Red
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« Reply #9 on: Mon 11 August, 2008 - 11:43 am »

 
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krispie
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« Reply #10 on: Mon 11 August, 2008 - 06:57 pm »

My girls helped build rafts when they were in scouts    *runs off giggling*
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Red
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« Reply #11 on: Tue 12 August, 2008 - 09:05 am »

Thanks for the valuable advice Krispie. 

It will come in handy I'm sure. 
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Weevilgenius
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« Reply #12 on: Fri 15 August, 2008 - 11:38 pm »

feck, I forgot to ask at work, our chief naval architect is completely doollally coming of the morphine after surgery and the rest of them are all wankers...

will attempt to ask before I leave... might even come up with a solution meself but I'm not so good without seeing the actual structure...
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The Schizzle
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« Reply #13 on: Thu 21 August, 2008 - 02:07 pm »

You shoulda got a job at Alloy Yachts Peeper


Awesome staff..awesome bosses 
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Weevilgenius
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« Reply #14 on: Fri 22 August, 2008 - 11:14 pm »

You shoulda got a job at Alloy Yachts Peeper


Awesome staff..awesome bosses 

I've got contacts out there (who say it's good) but I'm really over yachts and Aucks...

I want my happy back and it aint here...   eek  I gonna go find it.

Sorry Red, I never did get to ask anyone who would be able to say "yes, do it this or that particular way" and without more specific knowledge I can only say it makes sense the way you've explained it and I think ply would be fine, and easier to build yaself...

I will have a think though...
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The Schizzle
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« Reply #15 on: Wed 27 August, 2008 - 04:39 pm »

Thanks anyway Snowpee, I'm doing it in Aluminium, it's cheaper and easier. May not look as professional but it will work and it will be strong.
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Red
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« Reply #16 on: Mon 1 September, 2008 - 02:11 pm »

Before.








During......




Helluva mess.









New motor to go on...











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Red
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« Reply #17 on: Thu 11 September, 2008 - 09:23 am »



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Weevilgenius
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« Reply #18 on: Thu 11 September, 2008 - 10:56 am »

well done, you MAN you! very blokey accomplishment 

           

 
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The Schizzle
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« Reply #19 on: Thu 11 September, 2008 - 11:31 am »

It's quite an interesting little project actually.

I'm looking forward to seeing it all done now, hopefully within the next couple of weeks. 
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Goober
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« Reply #20 on: Sat 13 September, 2008 - 02:50 pm »

Had a 12 foot parkercraft with a 75hp outboard a few years ago. The only problem i had was if you opened her up the bow lifted and water came in over the stern
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Red
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« Reply #21 on: Mon 15 September, 2008 - 08:18 am »

Had a 12 foot parkercraft with a 75hp outboard a few years ago. The only problem i had was if you opened her up the bow lifted and water came in over the stern


 Brought to you by dab
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dab
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« Reply #22 on: Fri 19 September, 2008 - 01:59 pm »


Blistering Barnacles!!
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Red
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« Reply #23 on: Fri 26 September, 2008 - 04:18 pm »

Won't be long now......

 soo cited
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Brain
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« Reply #24 on: Fri 26 September, 2008 - 07:43 pm »

did you sell the old engine?
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Red
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« Reply #25 on: Sat 27 September, 2008 - 12:11 pm »

Yes, I still haven't sent it yet tho. it's going to Christchurch.
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Red
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« Reply #26 on: Mon 29 September, 2008 - 02:29 pm »

Slowly getting there. I still need to sort the steering and electrical system etc, and I will need to modify the transom slightly so the engine will tilt a little bit more. We didnt want to extend the pod too far out as this would have made the boat tend to Porpoise.





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Brain
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« Reply #27 on: Mon 29 September, 2008 - 08:08 pm »

 

wow!!

thats look just like the real thing!!   
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Red
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« Reply #28 on: Fri 10 October, 2008 - 12:49 pm »

Had the motor running last night, I've finished mounting everything and done the wiring for the motor etc. I pulled all of the old wiring out as it was pretty rough and am starting from scratch with the lighting and electronics.
Then plumbing or the extra fuel tank and a bit more woodwork and she'll be right! 
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dab
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« Reply #29 on: Fri 10 October, 2008 - 02:32 pm »

 eek


cool!
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Red
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« Reply #30 on: Fri 10 October, 2008 - 02:34 pm »

Yeah, getting a bit excited about the whole thing now. It's been a good little project.
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Red
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« Reply #31 on: Mon 3 November, 2008 - 07:37 am »

Pretty much all there now, just a couple  of tidy up jobs to do.



Well we tried it out on the weekend.  and  eek Holy s**t, it goes like a bloody raped ape!



22 knots at 3000 rpm and 41.3 knots at 5000 rpm!
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Fraggles
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« Reply #32 on: Mon 3 November, 2008 - 08:18 am »

      you the man REDman   
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Red
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« Reply #33 on: Mon 3 November, 2008 - 09:13 am »

     And we caught a feed! 
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Collie
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« Reply #34 on: Mon 3 November, 2008 - 09:44 am »

 eek    what does a raped ape go like?


 
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Brain
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« Reply #35 on: Mon 3 November, 2008 - 10:15 am »

wow!!!

it works and everything!!

  good going .  now about that marlin.......


 
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Red
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« Reply #36 on: Mon 3 November, 2008 - 10:28 am »

eek    what does a raped ape go like?


 

Surely you can use your imagination for that one Collie!!   
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Red
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« Reply #37 on: Mon 3 November, 2008 - 10:29 am »

I promise JJ, as soon as I get one, you'll get a piece. 
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Brain
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« Reply #38 on: Mon 3 November, 2008 - 11:02 am »

 


it better be a record breaker
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Red
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« Reply #39 on: Mon 3 November, 2008 - 11:37 am »

It will be...     And why you laughing?  eek  I'll send you some.
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Brain
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« Reply #40 on: Mon 3 November, 2008 - 12:14 pm »

 eek

good , i like smoked marlin.



    
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Collie
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« Reply #41 on: Mon 3 November, 2008 - 05:32 pm »

eek    what does a raped ape go like?


 

Surely you can use your imagination for that one Collie!!   

 

 
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dab
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« Reply #42 on: Mon 3 November, 2008 - 09:04 pm »



22 knots at 3000 rpm and 41.3 knots at 5000 rpm!


holy s**t! 

excellent! you'll be able to ski as well.
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Red
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« Reply #43 on: Tue 4 November, 2008 - 04:41 pm »



22 knots at 3000 rpm and 41.3 knots at 5000 rpm!


holy s**t! 

excellent! you'll be able to ski as well.

I did mention that to the kids..... but they'd far rather ski on the computer or the x-box... Reality is so gay apparently. 
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