Breakthru Hull Design...

Very good looking boat!!! Can someone explain the "rising" hand-rails on the bow?

This boat was built for a guy living ten minutes from me. I have never seen it go faster than on the picture, but there are a couple of sister-boats with "normal" transoms and they are pretty fast and seems to go well. The shape of the double "sharkfins" on the fore deck are most likely to follow up the overall design theme.

With the American flag flying on the back I was under the impression that it was of American ownership. Nonetheless it is a gorgeous boat.

I would agree that the front middle "lifeline" rails are to follow the design aspects of the boat...they would also be functional as for going forward on the bow as you would more than likely get to your knees on this kind of boat the farther forward you went. If it were my boat I would consider a lifeline that is just a few inches above the deck...I think the current one would distract me a bit as I was navigating.

I knew it was a handrail/lifeline... of sorts, but I've never seen anything like it on this side of the pond. Previous drone development by the military came to mind when I saw this contraption. They used a launch rail for reconnaisance aircraft to get them off the deck in short order.

You should have seen the "net" they used to catch them when returning to the FBO. They missed constantly!
OK... so we loose the hand-rails and bring it to America?

Running Shot

It really lifts up...the hull design is impressive to say the least...very beautiful boat in my opinion.

Zero Cavity

This is Zero Cavity which was owned and driven by Dr. Santiago, a dentist in Florida...he spent a lot of time and money dialing this boat in and ran it in the One Design Series briefly before jumping over to the Performance Class...the boat simply flies!

Now that's a "Wing In Ground Effect" vehicle! Nice shot.

Thought some of you may find this one interesting.....

The Earthrace

Same idea but in a smaller scale, a young Swedish design student, Josefin Carne, has developed a Kajak with outriggers to be towed by a Kite (remember the TRY Kite-kat) when you are not paddling. She calls it Trijak and a model is made but no fullscale production that I know of yet. But I will surely buy one the day they are reality, since I don´t trust my ability to stay on the right keel with a normal kajak...

Mr. Offshore...

You will be happy to hear, your boat is available! However, it's somewhat smaller than the original production version. This model is being manufactured by Graupner. It is 930mm long and it's remote control. Graupner is a leading manufacturer of remote control models and this boat represents the 2nd model they have produced of an Ocke Mannerfelt design. (the first being the B-28)

A big thank you to YachtForums member "PromoceanModels", for sending me this picture to pass along to you. Enjoy!

Graupner builds a very nice model, I will definitely have to check that one out. I have the other Mannerfelt model, but it is actually the enclosed canopy B-24 (V-24 as we call it here in the US). I have hull and deck of the B-28, when we were building the boats in Kentucky (full size boats) we had a mock up of the B-28 made...it was nice. I powered mine at the time with a 3.5hp Cobra motor...it ran somewhere in the 55mph range. When you would come by the shore or dock with it you could actually see the hull pulling air down into the steps aerating the running surface.

Yep... often the dynamics remain the same, no matter what the scale. A lot of our development work was verified at the Large Cavitation Channel in Memphis, using models that were exact scale replicas of our conceptual designs. We utilized a CRAY 9000 to calculate our theoretical concepts, but ultimately scale models were built for confirmation. As designs proved worthy of further development, we would build larger manned-models for demonstration and further evaluation.

Outside of the confines of our research facility, some very interesting ideas were conjured up on paper napkins and a couple of beers.

I have a friend who knows nothing about nautical design, yet he continually carves hull designs into bars of soap and shows them to me asking my opinion. While I think I can look at most of what he has come up with and explain why it won't work, sometimes he has some interesting designs come across the old soap dish.

More than likely the best ideas at one level or another start out on a napkin!

Pilotboats use this construction since you dont have to climb óver a rail but still have the advantage of being able to hold yourself .

In studying the model from Graupner posted ealier in the thread... I see a deck hatch in between the rails. Now it is clear why the rails "rise" forward from the deck... they double as a handrail to enter or exit the hatch, as well as a lifeline that doesn't need to be hurdled when docking. Good idea!

I posted this in the Wally thread, then thought it interesting enough to put here for the non-Wally fans....


Wally has recently posted news reporting that they have tank tested their 55m Wallypower design. Confirming their calculations.

From Wally....

"The results of the tank testing conducted at SSPA facility in Goteborg, Sweden, confirm that the hull shape of the mega yacht 55m WallyPower developed by WallyDesign© department, is the most efficient design of this size range yachts.
The excellent hydrodynamic characteristics of the 55m WallyPower provide for less fuel consumption, more speed, softer ride, and more comfort."

I've provided a picture of the yacht for referance, because I was wondering if this design could be more efficient than a bubble bow?
Their statement of "the most efficient design of this size range" is pretty bold and doesn't seem to make any exceptions.
If it is more efficient that potentialy means better efficiency/speed than a bubble, with the ride comfort that sharp upwright bow should provide.

In effect, the Holy Grail.

For the full report.....
http://www.*********/jumpCh.asp?idUs...l=26&idLang=IT

I thought the bulb bows were strictly for displacement hulls, not the faster designs?

Kelly

bulbous bows

Kelly,

the wallypower 55 is a displacement yacht (17 knots).

I see some similarities with the "Axe-bow" concept developed by Damen and featured in Boat International recently. Except that the axe-bow is even more radical (deeper) and intended for boats operating in the semi-displacement range.

But the idea - very narrow deep bow sections and vertical stem - is similar.

Bruno

My bad, didn't know Wally had any that slow!

Kelly

Damen shipyards present the Axe Bow

Newest bow form from the Netherlands;

This bow is specially designed for single hulls from 30 to 100 mtr. with topspeeds above 20 knots; greates advantages are with rougher seas; reduces hits by waves 4 times because bow always stays in water so it gives speed without the usual hammering on material and people.