Spot the boat

[MapisM]

Wadduthink, folks?
Any guess is welcome of course, but I'd be particularly curious to hear the one from PYB...

 

[jrudge]

So I guess it is Italian ?

 

[rich2925]

Maybe a Donzi ?

 

[stelican]

Thought it was a Itama and then realised the exhausts were not large enough!

 

[BartW]

Looks very much Itama, but that would be too simple I guess,

there is a Sport boat in the Yard in Santa Maria d C , with surface drive with a similar Tube on top,
I'll try to make fotos next thursday.

 

[Portofino]

It’s not an Itama , well a factory specced ,
The bathing platform is generic , a local Roma yard ?
Exhaust btw are underwater on Itama , Amati is credited with inventing them for noise abatement.
The pipe at the corners on Itama,s is a fart pipe , and low pressure. Low rpm escape , to help with back pressure .
Itama,s engines are mounted central in the hull , how ever as well as that helping with lower shaft angles all less than 10 degrees, he even shoved the props P bracket so far back ( lowering the Shaft angle as much as possible ) so,s having to fabricate a rudder bar on some boats that sat under the bathing platform .
He also offered Arnesons on some modals ,so all in all considering the above and looking at the image presented for ID ,
It’s unlikely to be an Itama , - - unlikely , If it is the base Hull ,it’s not Amartis work ( guessing )

 

[Deleted User YDKXO]

there is a Sport boat in the Yard in Santa Maria d C , with surface drive with a similar Tube on top,
I'll try to make fotos next thursday.

Very odd looking surface drives. Is it some kind of vented prop drive system? Looks like an Itama to me as well

 

[stelican]

Not enough deadrise for an Itama

 

[Portofino]

Very odd looking surface drives. Is it some kind of vented prop drive system?

Looks to me as if they can vent the props through an exhaust in the “ leg “ bit .
I think they need venting to reduce the torque requirements to turn the huge pitched props , and reduce prop drag .

Arnesons you simply raise them up when starting so they ventilate , also as you go real fast with arnies , due to prop pitch ,they kinda create excess drag at higher speeds , so you can lift the top 1/2 ish part , the drag inducing part out of the water to really fast upwards of 45 knots or so , where the actual props drag is considerably higher and needs reducing .
.
With that system in the ^^^ pic , the rudder ,will drag obviously, and maybe @ speed airating the top 1/2 of the pitched prop by that through exhaust, is designed to reduce its drag inducing part - bit like lifting Arnesons ??

If I was going for surface drive I think Arnies are the way forward .- - once you learn how to replace the ram seals diy .
It’s not difficult. I watched a guy do it earlier this year .Messy he got covered in hydraulic oil bleeding / flushing etc .

How ever maintenance wise that does look simple and I can,t see anything ( except the cutlass bearings ) that,s gonna go - like bellows , ram seals , UJ joints . But where are / is ? the steering ram ( s) , If submerged then seal issues ?

Here s a few Itama pics for comparison -

https://imgur.com/gallery/DXnmh

 

[MapisM]

LOL, I guessed this wasn't going to be easy. I'll throw in another hint...

 

[Portofino]

Somthing from one of the Abatti bros ?

 

[MapisM]

If you mean Abbate, no cigar I'm afraid.
Nice try though, 'cause they did build some boats with weird in-house built surface drives - usually mated with BPM engines...

 

[vas]

Long shot, Italcraft?

 

[MapisM]

Italcraft ain't a bad guess at all, and for all I know she could well be correct, also because the surface drive does remind the so called "Levi drive unit" which Italcraft experimented.
Anyway, I must admit it: I actually don't know what the right answer is!

She's sheltered in a very tight space, and the little I could see of her sides made me think of Baia/Itama/Tornado/Magnum...
That sort of pure open boats, deep V hull, around 40 feet, but without any logo in sight.
I ruled out Abbates just because I know them well enough to be fairly sure that this is not their own work.

Anyway, these are the reasons why I was curious to hear from PYB, who is our resident bible on this sort of boats.
I was wondering if the surface drive alone would have been enough to identify her, but maybe not...

 

[fisherman]

I know the square root of offal about this but are the pipes with flaps upside down/cut the wrong way?

 

[MapisM]

I suppose you're talking of the steel pipe right under the swim platform, visible in the left upper corner of the first pic.
If so, I don't think there's anything wrong with it.
The flap is mostly meant to avoid/limit water reversion when going backward, and in that situation it should do its job nicely, though I understand why you might be skeptic about that, when looking at it statically.

 

[BartW]

here is the boat i mentioned about,



it is a pershing 60 with arneson Surface drives,
but I was intrigued by these tube- hose- tube on top of each drive, (on both sides open)
can someone explain their function ?

 

[Portofino]

here is the boat i mentioned about,



it is a pershing 60 with arneson Surface drives,
but I was intrigued by these tube- hose- tube on top of each drive, (on both sides open)
can someone explain their function ?

It’s to reduce the drag by air rating the none functioning drag inducing top 1/2 .
The pitch is severe and needs a heluva amount of torque to spin it .
Airrating speeds up the acceleration to plane ,once planing you lift the top ( drag inducing ) 1/2 out so only the driving 1/2 the bottom is in the water hence the name surface piecing .

The airation helps at lower speeds getting it up on the plane , helps to reduce the drag ,it will spin up quicker .

 

[MapisM]

can someone explain their function ?

Yup, as PF said, they are meant to bring air to surface props, increasing their slip upon acceleration, when not yet in full surface mode.
This allows the engine to spin at higher rpm and produce more power, which eventually brings the boat up to plane faster.
Buzzi pioneered the concept on his race boats, but it's nowadays a rather popular solution, with some specific kits already available, like these, for instance.
Actually, the tubes on that P60 look a bit Mickey Mouse, and make me wonder how effective they can be, due both to their length and the somewhat small diameter.
And usually, it's a trick that only makes sense on seriously fast boats - I mean, those into 3 digits speed territory, or not far from it.
Pershings are almost sedate cruisers, in comparison...

 

[PowerYachtBlog]

For me it is a Baia B40 due to the shape of the Vee, sharp ending and not bell shaped as in the Magnum, Itama, or Tornado.

Possible other choices can be an Italcraft (but the F38 which had the Levi Drive units had a sloop style with integrated platform), or an old Bruno Abbate 40 or 46 Primatist.

Anyways I saw in the past a Magnum 40 and Baia B40 for sale with similar or Levi Drive Units surface drives.