Boat porn

MapisM

MapisM

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I can't recall to have seen any bits of mobo pornography recently, here in the asylum.
So, maybe someone might like this video, whose link I just received from a boating mate who asked me an opinion because he's half considering to buy himself a really insane toy.
Obviously, surviving a bad accident with his Aprilia RSV Mille R wasn't enough for him... :rolleyes:
Not exactly breaking news, tbh: the video was published in Aug last year.
But a peculiar vessel nonetheless, which the petrolheads among us are bound to like! :encouragement:

Just don't pay too much attention to the commentator. How that chap managed to be somewhat successful with his seatrial videos, is something I never understood.
Sometimes, you have to wonder if he really doesn't have a clue about what he's talking about or he believes that his viewers don't...
As an example, his explanation of the reason for fitting staggered engines (around 2:00) is beyond a joke! :ambivalence:

PS: incidentally, does anyone know if these "only in America" boats can be CE-certified? Afaik, those Merc Racing engines aren't.

PPS: here's the YT link, for those who don't see the embedded version:
http://www.youtube.com/watch?v=U1cXpS03nXE

 
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How is IT placed for onshore storage facilities, besides big centres like near Fumicino on the Tiber River?
You wouldn't leave these types of boats permanently in the water, would you?
 
There’s plenty of on shore storage in IT .Infact generally the Italians probably winterise more than most .
They like hiding high value things inc boats :):):)

I like the presenter and his stuff ,but I am biased as he,s a member of the Itama owners group .
Noticed it was lake flat during the test and he was buffeted about quite a bit ,in fact a lot .
That makes conversation impossible and knackers hairstyles, ok if you are challenged in the head hirsut dept ,but ladies will not be happy .
Hats will go flying too .
I,ve seen these “ Cigarette” boats in the SoF , well you hear them before seeing them .
Anything chop wise ( inc others wake ) they bounce and bump along ,you see the occupants clinging on trying to keep there bums on the seats .
Like this -
https://m.youtube.com/watch?v=7LfWrkTb3Go

When anchored up there’s nowhere for a table / lunch ,and the min bathing platform and zero Bimini along with not enough lay down ( sunpad ) space for them all (5/6 ) makes it a short “ rest “

Bike analogy for a couple of petrol head lads is best over sociable fast boat to pull birds in .They won,t come again assuming they can walk comfortably after - back trouble guys :)

Maybe driver and pillion only going out in dead calm ( count the fingers on one hand - not both in a season ) and emptying a tank of fuel only - but it’s too weather depending @ sea .

It’s an “as well as boat “not instead of .

https://m.youtube.com/watch?v=LDxq8GEva7o
 
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On the subject of mobo porn I still have on my bucket list to attend one of the American Poker Runs. Those boys know how to throw a party. The Tickfaw 200 has just concluded this year. I imagine if you like a bit of variety to your porn it's got to have some legs


video credit Brandon Thornhill

More on this group https://www.facebook.com/groups/227411737443020/
 
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I just added the link in the OP.
Actually, I was aware that embedded youtube clips sometimes are not accessible for some reason, but didn't think of adding the link right away, sorry.

@AM: yup, as PF says there's plenty of sheds all around the IT coast, albeit dimensions and prices can vary a lot.
None of my lake toys have ever been antifouled, in fact: I just rang the yard 20 mins before arriving, they pulled out the boat and all I had to do is turn her on and go.
Same upon return, she was lifted and stored right away.
The yearly cost was almost double for an 8m boat compared to what I pay now for 17m, but the service was excellent...
If you are you considering a Marauder to keep around here as a break when it's winter down under, you can count on my full support! :D :cool:

@PF: I'm not sure that these boats are more bouncing and bumping than any others - for most of them, I actually think that the opposite is true.
I mean, most are pretty deep vee, usually warped and with a sharp entry, not to mention the length to beam ratio.
Trouble is, the faster you go, the harder water becomes.
It's practically impossible to "cut through" waves at 100kts. If you hit a two feet wave at that speed, any boat bounces and takes off, no way round it...
 
BruceK said:
On the subject of mobo porn I still have on my bucket list to attend one of the American Poker Runs.
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Me 2, but just watching from the shore would make me feel envious.
In fact, I'd rather not attend unless having the opportunity to be afloat somehow.
Still working on that... :rolleyes:
 
BruceK said:
I have a couple of boating friends in Louisiana and Florida that attend so can overcome that problem
Click to expand...
If you think that they might be interested to invite also someone who would gladly reciprocate with some Sardinian boating, just say when! :encouragement:
 
MapisM said:
PS: incidentally, does anyone know if these "only in America" boats can be CE-certified?
Click to expand...
In the video at about 7.19 the table states CE Cat C. I dont know whether thats a true reflection of the seakeeping ability of the boat or just the fact that its very narrow beam means that its lateral stability isnt good enough for B or A. What are these boats like in a big sea, particularly a big beam sea?
 
Deleted User said:
In the video at about 7.19 the table states CE Cat C. I dont know whether thats a true reflection of the seakeeping ability of the boat or just the fact that its very narrow beam means that its lateral stability isnt good enough for B or A. What are these boats like in a big sea, particularly a big beam sea?
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Ref.CE, I don't think the C classification has to see with stability.
My understanding is that among other things, starting from B, any external areas of the boat has to be self draining without needing any pumps.
Which implies that the cockpit floor must be higher than the w/l. Something which is never going to happen, in such narrow boats with heavy engines astern.
Anyway, I suspect that they claim the boat to be CE compliant because she's probably available also with the 600Sci (possibly triple), which afaik are the more powerful CE-certified Merc Racing engines.
But I don't think that crazy friend of mine would still be interested... :rolleyes:

Ref. your last question instead, in a sea big enough to not allow maintaining P speed, these boats are as awful as you would expect.
But other than that, they are the quite simply the best, smoothest and more stable boats to be in - for any given size, obviously.

I disagree with PF when he says that they are shockers in rough seas, because that's being economical with the truth.
Which is, when going fast in rough seas, you must be prepared to have a bumpy ride with ANY boat.
BUT, with the likes of Apaches, Donzis, Cigarettes, etc., there are two big differences vs. boats aimed at more "normal" cruising:
1) for any given sea conditions, the sustainable speed is higher.
2) for any given speed, the ride is less bumpy.
Which are actually just two sides of the same coin.

Of course Itamas, Baias, Magnums etc. are great boats which can withstand harsh conditions, but they are still compromise boats, pretty beamy to grant a decent accommodation, etc.
Otoh, when the capacity to sustain high speed in rough seas is the only thing that really matters, like in law enforcement FPBs, none of the above (excellent as they are in many ways) even make it to the short list.
In fact, none would have a snowball's chance in hell to outrun for instance the FB boat below - which is in fact more akin to racing hulls - no matter how rough the conditions.
11.jpeg
 
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Deleted User said:
Impressive how level the Apache flies in that vid. How is that accomplished given the fact that the heavy engines are well aft?
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Not much to see with weight distribution, in that sort of conditions. More depending on the throttleman's balls, I reckon:
1) keep the levers down right up to the split second when the legs come out of the water;
2) release them PDQ to avoid overrevving while on the fly;
3) hammer the levers again PDQ upon re-entry, to avoid destroying the transmission due to backpressure on the props;
4) repeat. :encouragement:
 
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@mapishM —- Almost right , just the “ less bumpy” in any given sea state bit , needs addressing.

It’s not true , and here’s why —-

In these racing boats they have a narrow beam and low aspect ratio because the leading edge of the plane accounts for a major portion of both drag and lift .
Since lift rises as the Sq of the speed and drag increases at less than the sq of speed ,every proportion of leading edge increment becomes successively more and more worth while .
So planing hull requires added beam for a given amount of lift .
If you have not got that beam then the lift is reduced - but here more than compensated by the extra Hp on tap to create speed .
These boats will have higher planing speeds ,than boats with greater aspect ratios .
Reduced wetted areas hence the speed .
The speeds a given , it’s the ride that I,am challenging .
See the various u tube vids of them “flying “
Two things we need to consider loading of the planing surfaces and resistance .

The unfavourable resistance of a narrow beam in ROUGH WATER ( not flat seas ) is due to 3 main factors

1- the leading edge which is the most effective area in lift , therefore the wider hull benefits from a greater lifting surface and shortens it’s cord or length of plane tending to reduce its area of negative pressure .
So a narrow hull will have behave the opposite.
2- narrow hulls have difficulties running flat in big seas due to the smaller lifting area they change there AoA faster , The greater L of a narrow hull together with its tendency to keep altering its trim ( wider boats of aspect ratios near 3.5 tend to keep within a smaller trim range ) creates so high a longitudinal metacenter that the hull tends to plunge through rather than ride over waves .
Leading to stuffing the bow in big seas , where a wider boat in the same sea state does not .
A major factor in the ability of a planing hull to operates successfully in a big sea is that it shall be free to trim with the wave slopes .
So far nobodies posted except me ^^ one of these n a big sea .
This requires the smallest possible longitudinal moment of inertia to foster lightness in the bow , a condition in which a long narrow hull cannot compete with a wider shorter hull with a higher aspect ratio.

3- the effect of suction under the aft end is inversely proportional to the aspect ratio.More so in variable deadrise .
At higher speeds these boats achieve the frictional resistance of the wetted surface becomes the greatest form of resistance compared to other forms .
Therefore wave making resistance can be safely increased by a steeper plane angle up the point that where additional lift no longer reduces wetted surface ,
At this point the hull is more subject to the action of cross winds .
It can take off if it hits a bump .As seen in the various vids / pics thus far ^^
Boats plane and rid better and are more comfortable without constant
daylight appearing under the forefoot .
Going airborne is a no no to ride comfort .A boat that stays in the water is more comfortable.
View attachment 71020

Let’s now move to loading and planing surfaces with regards comfort .
The actual weight per Sq M of load planing surface is important.
That 50;ft in the 1 st post is approx 7 tonnes
This is deliberately light or low because it offers a substantial reduction in wave making resistance and at low speeds some reduction in wetted surface friction over say a typical 20 ton 50ftr .
There’s an optimum loading for safety and comfort in a chop .
With lower aspect ratios and low weight boats ,the dynamic forces due to wind and wave action assume magnitudes disproportionate to the availability of balancing forces .
Planing hulls too light on the water tend to take off easily, hurling themselves through the air .
This may be good for racing but not for comfort.

Furthermore the exposure of excessive surface to a high wind broad off the bow can result in heeling of a lightweight hull on its beam end , should this happen when it’s more or less out of the water , it may return to the surface with an angular impact sufficiently enough to capsize it .like his https://m.youtube.com/watch?v=cLrQbIjQavo

There no dividing line between safely and unsafely loaded planes ,it’s more like a case of more loading ( weight ) up to a planes maximum lift the safer .,Beamier boats can create more lift / carry more load = less inclined to take off = more comfortable ride .
In other words heavier boats to plane the safer at speed , but obviously you need more Hp ,
So weights as important in seakeeping at speed as beam .

Scientifically I stand by my assertion those low aspect ratio , low weight ( low load ) boats have a poorer ride in anything other than flat seas .

Faster sure ,buts that’s as said a given , low drag high Hp .

Knack for ride is add Kg s ,beam , careful weight distribution for balance around the centre of lift , engines in the middle , and of course plenty of Hp .
Deep V helps too buts that a commonality with those racing boats , and Itama , Baias , Pershing , Magnum , Otam and the like .
I,am not biased really:)
 
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