[brian eiland]

Thanks for your criticism Daiwa. I must always remain open to outside suggestions. Please be aware that this is not a final design….it is a concept from which an individual will modify it according to his/her needs.

Originally Posted by daiwa

Because your outdoor design overall is very balloon there´s not much flat space & work & walk if needed. Any change of the sails ie. requires crew to walk ahead of the hull.

I understand your concern here. I believe the model of the vessel helps create this ‘balloon’ misconception both with its pronounced rounded shape, and with the color distinction between the deck edge and the hull sides located in a ‘sheer sort of manner’. The curvature on the scale model is actually greater than on the actual drawings of the vessel. The deck in this area is actually much flatter than it appears on the model. Carrying the deck color over into the topside area to ‘fake’ a lower sheer line also contributes to this more rounded appearance. Then there are lifelines provided along this deck’s edge that are not shown on the model, nor on the drawing.

You might note that a “change of sails” is not required of my sailing rig, so there is not the necessity to go forward to do anything with the headsails. And since I don’t have a traditional mainsail, it is not necessary to climb up on the deckhouse roof to facilitate a reefing or storing of that sail.

No problem to add a ‘soffa’ to the bow area

….second level (flybridge), which usually is most popular space for people to stay is strange way too small when considering the boat size even if your would add flybridge option. It’s also sun and raining protection roof for the maindeck where dinner & entertainment has been planned to be ie. dinners.

Again I emphasize this was just the concept drawing. I elected to show the very minimum of an upper control station, and particularly one that would not interfere with the fishing cockpit. There was a seat provided for the helmsman, and there could be another beside that. Further to the opposite side there was an open deck area where one might lay out a big cushion for two sunbathers or lounging passengers. In this fishing version it was a limited flybridge area. At the aft edge of the deckhouse roof there could be a rolled-up deployable shade that could provide rain or sun cover to the most aft portions of huge aft maindeck area. And of course there would be a foldable bimini cover for the helmsman and his mate.

Third issue could be size of the second level ie. flybridge, you had missed a lot of squaremeters for nothing considering the overall size of the boat. Remember second level where boat skipper is also located while sailing is most popular space to stay for all people in the boat while sailing. This is usually one of those key things which makes cat to have huge squaremeters and space to stay vs. mohohulls.

Alternatively for the non-fishing motorsailing version there could be a provided a larger flybridge area ala the Lagoon 500, or an even bigger area much as with the new Lagoon Powercat 44. Steve Dashew has praised the use he gets out of his flybridge area onboard FPB. http://www.setsail.com/dashew/Fly_Bridge.html
But have a look a little closer. In most cases the flybrige area is expanded when the lower deck availability is more limited. If you have a really nice BIG aft deck area and big sunning areas up front, you begin to question the need for a really big flybridge area in addition.

I have one other problem with really expansive flybridge areas. You need to provide increasing amounts of headroom and clearance for the boom of the mainsail. The booms get to be 20 feet off the water, and thus the overall rig heights go up to 100 feet and more. Stability of the vessel is adversely affected. And the very positive aerodynamic interaction between the big lower portion of the genoa with the non-existent mainsail area of this high-boomed mainsail, is lost. For a visual http://www.wb-sails.fi/news/98_11_PerfectShape/Main.htm and scroll down to "Think One" Discussion http://boatdesign.net/forums/showthr...p?t=457&page=7

Catamaran pontoons from the backside should be well sized, to design "backsteps", in your design they are far too small and seems to not carry overall hull royal way. For me it looks like a there´s only 2 sticks where the huge hull lies. See the example for example french factory where this part of the design has been taken good care

I will assume you are questioning both the bulk of my hulls in this area, as well as the size of the backsteps?? Far too many of the French cats are designed for the charter trade and carrying big loads in shorter boats. The slenderness ratio of their hulls is often in the 8-1 or 9-1 range. My vessel carries a 14.5-1 ratio. It’s this slenderness that allows the vessel to avoid displacement resistance, and to carve thru the water with less sail and/or power requirements. Big fat transoms are more buoyant and require a resisting buoyancy at the other end….thus fatter bows that plow up more water or increase the pitching tendency. And be particularly concerned when running down big waves with big sterns.

I’ve seen all of these ‘grand stairways’ to the sea that incidentally most often offer no handholds to grab onto….fine at the boatshows, but not at sea. I much prefer to walk down my more narrow, indented steps with something to hold onto, or lean against rather than fall over the side. Besides I don’t need a big width of steps to stroll down side-by-side. I did notice that the great looking Exclusive 72 also chose to 'indent' their stern stairs. http://www.exclusive-marine.com/page...rticle-28.html

Forth thing came to my mind also, are you trying to start new factory and cat brand with your own designs ? That require a lot and very good / professionals venture capitalists on board, even you would build first boat at your own risk.

No factory, nor my own brand. This is not intended to be a ‘production boat’. It is a custom design, a concept, and meant to be the basis from which to do some similar vessels. If I could afford it I would definitely have one for myself.

Boat concept is only one small piece of it. If you do so, at least turn out from US market for less expensive labor markets like to somewhere to FarEast. It´s not easy to enter to the market which is all ready full (=meaning perfect competition running all ready ) ….that in mind only thing where you find yourself from the marketplace is to be competitor by pricing. Remember that buyers require major and long history of building boats/yachts, backgroud, sometimes also success in sail competitions (actually numbers of builders had started they reputation via this way like Nautor Swan). This all bring to have also decent maintenance / warranty availability also.

I only do the design, not the building. I suggest to the client good builders from around the world that offer their history at building & warranty. And I offer an extremely cautious warning about building in China. Many of these yards will promise everything and not deliver.

….because your boat does not offer nothing new innovation which no-one else does (not including your rig and sails are more than usual) . Overall I think shaping a boat too much it’s not todays design anymore and haven’t see any does it either, even sailing boat bows have nowadays very sharp waterline.

I’m not exactly understanding your English here, but I assume you are saying ‘other than my sailing rig’ my design offers nothing new??

Well I beg to differ with you, but then not all new designs offer new innovation each time….many are variations on the past with differences in layout or appearance. Each design has its own style. I happen to think the current ‘fade’ of plum bows is often quite ugly, and particularly on already ‘boxy’ catamarans. And I think those sheer-lines that are drawn with a straight-edge ruler are ugly as well. A posting I made on the subject, Bow Aesthetics,
http://boatdesign.net/forums/showpos...3&postcount=87
http://boatdesign.net/forums/showpos...5&postcount=88

BTW, did you notice my plum bow variation on my 60 footer? (a variation of Lock Crowther’s Super Shockwave“Wahoo” http://www.boatdesign.net/gallery/sh...6/limit/recent


....Lets see, not including my innovative sailing rig….

How many ‘modern’ cruising cats do you find with centerboards??.
Or with the suggestion of a single centerboard, nacelle mounted??
How many with belt driven props, or forward facing props, and retractable props??
How many with a different type of bulkhead construction (resilent)??
How many with the rigging loads keyed so directly with the main bulkhead??
How many with a fore-to-aft bulkhead stiffening arrangement??
How many with an aux fuel tank that gravity feeds the engine in an emergency??
How many with a crow’s nest??
How many with a sword-fishing bow pulpit??
How many with a custom tender arrangement??
How many with the man-overboard pole slot in the transom??
How many with the rear seating over the engine to provide extra access and standing headroom??
How many with an aerodynamic-shaped deckhouse??



...Wahoo bow on mine
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