Aluminium boat building - 25ft fisherman

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fallguy1000
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Re: Aluminium boat building - 25ft fisherman

Post by fallguy1000 »

This is what I am seeing that looks like a hook. I jist did a finger sketch, which is exaggerated the other way...hook will steal performance badly, the boat will be slower and cost more in fuel..sometimes results can be very bad, so please run a string test, some of the pictures have different color plate on the aft section, so it may be an ilusion, but it looks like 15mm of hook..
363CC20C-AEE2-4556-9A59-FD52E239C15E.jpeg
Last edited by fallguy1000 on Tue May 11, 2021 11:30 pm, edited 1 time in total.
My boat build is here -------->

viewtopic.php?f=12&t=62495

TomW1
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Re: Aluminium boat building - 25ft fisherman

Post by TomW1 »

Looks good guy.

Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

lucastefanel
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Re: Aluminium boat building - 25ft fisherman

Post by lucastefanel »

fallguy1000 wrote: Tue May 11, 2021 9:04 pm This is what I am seeing that looks like a hook. I jist did a finger sketch, which is exaggerated the other way...hook will steal performance badly, the boat will be slower and cost more in fuel..sometimes results can be very bad, so please run a string test, some of the pictures have different color plate on the aft section, so it may be an ilusion, but it looks like 15mm of hook..

363CC20C-AEE2-4556-9A59-FD52E239C15E.jpeg
Hi, many thanks for your observation, i will check it for sure.
Probably it is an ilusion but is always better to double check, maybe could be because the bottom plates are only tack welded inside on aft side of boat.
Just in case at this stage of work can be easily adjusted by using a lifter from ground.
I will let you know and many thanks again for observation. :wink:

fallguy1000
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Re: Aluminium boat building - 25ft fisherman

Post by fallguy1000 »

I hope I am wrong!

I like the hull shape!
My boat build is here -------->

viewtopic.php?f=12&t=62495

lucastefanel
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Re: Aluminium boat building - 25ft fisherman

Post by lucastefanel »

Finally i've been able to step forward on my project!
Basically the bottom shape is done, lateral chine steps as well, tack welded, i will proceed later on with full weldings.
In order to close gap on keel line i will use ceramic for full penetrations welding, actual gap is around 20mm, probably i will be able to close a bit more and reduce some millimeters.
I used 0.5 and 1 ton chain blocks, belts and hanging devices for plates but at the end result is very good and i'm so proud of that.
Now my big question is:
- do anybody have some drawings for bottom hull steps? i would like to install befor turning upside down...
Thanks, Cheers!
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Fuzz
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Re: Aluminium boat building - 25ft fisherman

Post by Fuzz »

That is some fine looking work right there! Not sure what you mean by hull steps maybe someone else will know :doh:

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Netpackrat
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Re: Aluminium boat building - 25ft fisherman

Post by Netpackrat »

This is awesome and I am glad to see people doing the hard work of converting some of these designs to aluminum construction.

fallguy1000
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Re: Aluminium boat building - 25ft fisherman

Post by fallguy1000 »

Do you mean strakes?
My boat build is here -------->

viewtopic.php?f=12&t=62495

TomW1
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Re: Aluminium boat building - 25ft fisherman

Post by TomW1 »

For the keel and hull steps(strakes) they should be in your plans. First the keel should be a 1 x 2" skeg running from about a 18" from the transom to 13-15' forward. This will be your best help in tracking in all seas and in turning. Next are hull steps or strakes which when properly designed can help in planing. There is a section somewhere in here that discusses this. These could be flat for 3-5" out and straight down to the hull. Do not put them over the stringers as you will want to tow your boat with the stringers over the trailer flats.

I hope that helps.

Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

fallguy1000
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Re: Aluminium boat building - 25ft fisherman

Post by fallguy1000 »

Great point on not locating on the stringers Tom.
My boat build is here -------->

viewtopic.php?f=12&t=62495

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