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Old 22 June 2006, 03:30   #11
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Hi guys,of course, I'm not the one who pretend to come up with something totally new,many people think that the monohull limit has been reached and I'm of the same opinion,there is no reason to go wild with hull forms unless you have gone throug basin tests etc.
I was going to put steps under this hull,following the current trend on sport ribs,but then decided to go the opposite direction,moderate deadrise without steps.
I wanted to work on stability more than on top speed,all the small boats I have seen with steps behaved very unstable.
I would like to see this thing running with a couple of 225/250 outboard,the inboard is a driver's coice,and I like it,if you could hear the SOUND of this animal you'd understand!! the exhaust are open and unsilenced the entire lake knows when we are out for trials eheh,nothing better than a V8 scream for me.

Plus with the same power you have just one leg down = less resistence,of course you also have downs = single prop torque and instability caused by this.

The nose isn't really that upturned, as I mentioned the weight has been kept all the way back and the boat is very inclined back.

And yes,we used the laser cut method to skeep the plug,the mould has been built directly from the 3D files using a method developed by my friends at www.3dwmoulds.com this way you can come up with a fully frp navigating prototype.
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Old 22 June 2006, 04:23   #12
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Quote:
Originally Posted by fede
And yes,we used the laser cut method to skeep the plug,the mould has been built directly from the 3D files using a method developed by my friends at www.3dwmoulds.com this way you can come up with a fully frp navigating prototype.
Would you use this mould for a production run, or do you then need to make a new mould from the prototype hull?

John
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Old 22 June 2006, 05:35   #13
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Bravo!!

Have you experimented with, and without the pad keel?

Am I to take it it's loosely based on the Delta 25 then? nice boats! there are 3 or 4 over here still in service. Levi designed some lovely looking boats.

I'd like to lay my hands on his two books, but they are becoming hard to find.

Don't remember them having the flat pad keel though, more of a rounded form.

Which Merc 454 are you running? (how many hp)
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Old 22 June 2006, 08:43   #14
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Quote:
Originally Posted by fede
Plus you can see the entire mould construction on my web site
Superb set of photo's, Athough I'm sure that any builder/designer who was proud of their work would be able to show photo's from the beginning of plugmaking, through to the end result.
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Old 22 June 2006, 11:20   #15
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I like it. Almost looks like a baby FB techno 40.
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Old 22 June 2006, 13:07   #16
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For John Kennet : My Idea is to use this mould for a couple of other hulls and after all the modifications are done (I'd like to try with longer outer strakes and some negative angle at the chine aft) and the first leasure prototype is done make the official moulds.

For Jonny Fuller: Thanks!! Renato Levi,Fabio Buzzi and Tullio Abbate are my reference as far as powerboating is concerned,there is a big tradition on lake como for fast boats,Tullio is a dear friend too,I have both Levi books of course!! and learned a lot from there,you can purchase them directly from Renato's son, Martin, www.leviboats.com there is no one particular inspirational Levi boat,but I find the Delta concept very intersting and for Racing Boats,nobody is using it today and I still have to figure why...probably I'll find out myself soon!!
I'd like to try without or with less pad and see how it behaves...I have to figure out a way that doesn't involve drilling holes in the hull bottom.
Levi didn't used much pad in his boats.

For Dirk: maybe there is something I do not get in your words,No plug has ever been made for this hull, instead of the plug we made a direct laser cut mould to save money and time,I have pics that go from 1:6 scale model making and test to final RIB launch, if you want to see them I can zip and email them to you.
Attached a couple of pics of the selfpropelled model I used to test the Hull behaviour.
And by the way...you can see more building pics here: http://www.boatdesign.net/gallery/sh...00/ppuser/1683
page 1-2-3
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Old 22 June 2006, 13:14   #17
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Engine

Jonny,we are not shure of how much power the engine delivers since we never bench tested it,the carb is a demon,the cam has been replaced,an electric fuel pump has been added and don't know what else has been changed, I think the engine should deliver around 450 hp,and can get up to 5900 6000 rpm next season a 502 will take the place of the 454.
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Old 22 June 2006, 18:04   #18
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seen those mould pics on boatdesign.net i think?

Am I right in saying (without reading this thread in detail) that you made the mould straight away without a plug? If so, how did you get the smooth finish? What is the final coat on the mould surface?

Great looking project...one day I'll find the time and money to do the same!
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Old 23 June 2006, 03:16   #19
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Yes ,my gallery on boatdesign.net is this http://www.boatdesign.net/gallery/s...500/ppuser/1683
Yes we made a direct mould without the plug.
First,all stations and "spacers" where laser cut from ply wood, the whole structure is like a lego and can be put toghether in a day by a single person.
Then,battens are layed down to form the "net" that will support the panels.
Panels are laser precut from 6 mm Mahogany they are stapled and glued with epoxy resin.
Aftre this we gave the panels a sanded,then a 300 gr + epoxy for 2 times.
After this we sanded and then spray filler,sanding,spray filler sanding,spray filler sanding up to 1000 grit paper and the job is done.
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Old 23 June 2006, 04:50   #20
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Nice Job.

(edited cause I can't spell nice)
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