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Old 12-22-2015, 02:45 PM   #281
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Yesterday I made this sketch of an efficient motoryacht. I was trying for something that doesn't look like it came from outer space. I assume that will not appeal to the technically minded crowd, which is fine. She's about 62' x 13'6", around 50,000 pounds at full load, 1000 gallons of fuel. Twin 75 HP engines give 10 knots top speed and at 7 knots range is 4000 miles. One decent stateroom, room for tons of temporary guests, stand-up walk-around engine room, great living room, huge outdoor cockpit.

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Old 12-22-2015, 03:06 PM   #282
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Tad:

I like it! That said, I have a question... Is it necessary to have such a big spread, 11 feet, between the LOA and LWL? With slip fees in many areas being so expensive would it be feasible, visually speaking, to chop off 6 or 7 feet from the LOA?
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Old 12-22-2015, 03:21 PM   #283
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A unique and very high quality version of the concept is being built in Germany for coastal and inland waterway cruising, the Pinasse range of boats: www.pinasse-boats.com (German language version only).
That looks pretty nice!



and a related design:





Details here:

Nach 5 Jahren – Ein Wort zum Thema Qualität - Pinasse Boats
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Old 12-22-2015, 03:22 PM   #284
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Tad:

I like it! That said, I have a question... Is it necessary to have such a big spread, 11 feet, between the LOA and LWL? With slip fees in many areas being so expensive would it be feasible, visually speaking, to chop off 6 or 7 feet from the LOA?
Necessary? Nope, not at all.....but it's a slippery slope. Vertical stem and transom have their attractions. Long, lean, high-tech, unpainted aluminum motoryachts are (at some level) a display of wealth and conspicuous consumption. In this case we're using overhangs as a display of wealth, but also providing a public service in the form of harbour beatification. Folks who know nothing of boats will come miles to gaze at a bit of varnish.....
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Old 12-22-2015, 03:24 PM   #285
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Originally Posted by Tad Roberts View Post
Yesterday I made this sketch of an efficient motoryacht. I was trying for something that doesn't look like it came from outer space. I assume that will not appeal to the technically minded crowd, which is fine. She's about 62' x 13'6", around 50,000 pounds at full load, 1000 gallons of fuel. Twin 75 HP engines give 10 knots top speed and at 7 knots range is 4000 miles. One decent stateroom, room for tons of temporary guests, stand-up walk-around engine room, great living room, huge outdoor cockpit.

Attachment 47579

Your sketch kind of looks like this boat, but much better.

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http://www.yachtworld.com/boats/2003...9#.Vnm_OYm9K0c
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Old 12-22-2015, 03:54 PM   #286
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1. Simpler, thinner designs result in shorter and safer transit times, and more time doing what I really want to do which is explore the unique areas of the world.

2. I'm just interested in exploring the different issues and tradeoffs within the longer thin design.

3. And I'd just feel a lot safer in an aluminum boat that can handle a "knock down" from a large wave.
We started with a clean sheet with no preconceptions and then I read virtually everything I could find by people who have cruised the world on small boats.

We ended up with the Krogen because it seemed the best fit for what we wanted to do.

Lcr58, Looking at your comments in this thread and your last three statements above seem to sum up your position well: you started with your solution (2 above) and everything you've written just tries to justify that solution.

Sprinkled with "facts" that are not supported by data, but by your opinion. (1 &3).
And we keep on hearing the same trite lines over and over again.

In fact, this whole thread has become trite.
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Old 12-22-2015, 05:10 PM   #287
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"In fact this whole thread has become trite"

Then why are you here Richard?
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Old 12-22-2015, 05:18 PM   #288
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TAD,
Is your boat w a single rudder between the propwash of the two screws? I like that a lot.
I assume she has hollow Water lines fore and aft. A low PC and very efficient at moderate speeds. Wetted surface is probably minimal as well.
Very old school over all look and in a world of cheezy plastic boats is a big pluss IMO. I hope it goes far further than a sketch.
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Old 12-22-2015, 05:35 PM   #289
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Your sketch kind of looks like this boat, but much better.

Attachment 47580

2003 Ang Trawler 56 Power Boat For Sale - www.yachtworld.com
Love the tailgate concept.

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Old 12-22-2015, 07:04 PM   #290
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I love watching a PR guy at work. Marvelous. Keep it up.
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Old 12-22-2015, 08:31 PM   #291
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Question: how well do skinny boats do in a beam sea compared to a fatter boat? Intuition tells me: not too well. Am I mistaken?
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Old 12-22-2015, 08:39 PM   #292
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It would take less course change to reduce the rolling of a beam sea w a longer boat.
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Old 12-22-2015, 09:43 PM   #293
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Question: how well do skinny boats do in a beam sea compared to a fatter boat? Intuition tells me: not too well. Am I mistaken?
Paravanes.

An equally valid question would be...why do so many big & beamy boats have active fin stabilizers?
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Old 12-22-2015, 10:45 PM   #294
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Paravanes.

An equally valid question would be...why do so many big & beamy boats have active fin stabilizers?
The active finn stabilizers are a modern thing and so are big beamy boats.
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Old 12-23-2015, 06:44 AM   #295
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"Question: how well do skinny boats do in a beam sea compared to a fatter boat? Intuition tells me: not too well. Am I mistaken?"

Perhaps , fat boats LB 3-1 will roll from side to side as a wave passes abeam.

Flat bottomed or hard chines are worse than round , as the wave can lift from further from the center line.

A genuine long shinny boat LB of 6-1 or better will simply go up and down as the beam wave passes, with far less roll.

Which motion is less likely to cause a Vomitorium ? depends on your stomach.

Rolling can be resisted with enough bucks for hyd fins .

Up and down would require a slight course change.
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Old 02-12-2016, 01:37 PM   #296
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A new long-thin drone ship going into sea trials. Thought it looks pretty interesting:

World’s Largest Anti-Submarine Robot Ship Ready for Sea-Trials in April



The 132-feet (40 meters) long Sea Hunter, an unmanned autonomous trimaran, will be christened in April 2016 at the Vigor Shipyards in Oregon and immediately afterwards commence sea-trials for 18 months to test its long-range tracking capabilities, among a host of other things. During the testing DARPA will closely cooperate with the Office of Naval Research and the Space and Naval Systems Warfare Command.

The ship’s primary mission will be tracking enemy subs in shallow waters, I noted in June 2015 (See: “US Navy to Deploy Robot Ships to Track Chinese and Russian Subs”). Furthermore, I explained that the ACTUV “is designed to operate autonomously for 60 to 90 days straight, surveil large stretches of ocean territory and — should an enemy sub be spotted — guide other U.S. naval assets to the vessel’s location to destroy it (the ACTUV itself is unarmed).”

The ACTUV will only cost about $15,000 to $20,000 per day to operate, according to Scott Littlefield, program manager of DARPA’s Tactical Technology Office, quoted in Sea Magazine. (In comparison, a destroyers costs around $700,000 to operate per day.) DARPA’s website notes that the ACTUV’s “objective is to generate a vessel design that exceeds state-of-the art platform performance to provide propulsive overmatch against diesel electric submarines at a fraction of their size and cost.”

Full article here:

World’s Largest Anti-Submarine Robot Ship Ready for Sea-Trials in April | The Diplomat
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Old 02-12-2016, 01:47 PM   #297
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That looks pretty nice!



and a related design:





Details here:

Nach 5 Jahren – Ein Wort zum Thema Qualität - Pinasse Boats
Looks like an uglier version of my boat with a smaller cockpit and extended house with starkly modern lines..
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Old 02-12-2016, 01:51 PM   #298
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A new long-thin drone ship going into sea trials. Thought it looks pretty interesting:

World’s Largest Anti-Submarine Robot Ship Ready for Sea-Trials in April

Very cool. I wonder if SkyNet will become sentient in my lifetime.
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Old 02-12-2016, 02:09 PM   #299
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Originally Posted by Tad Roberts View Post
Yesterday I made this sketch of an efficient motoryacht. I was trying for something that doesn't look like it came from outer space. I assume that will not appeal to the technically minded crowd, which is fine. She's about 62' x 13'6", around 50,000 pounds at full load, 1000 gallons of fuel. Twin 75 HP engines give 10 knots top speed and at 7 knots range is 4000 miles. One decent stateroom, room for tons of temporary guests, stand-up walk-around engine room, great living room, huge outdoor cockpit.

Attachment 47579
Back to the 20s and 30s with the addition of modern building machinery and electronics. Many of the older power yachts would qualify as efficient. I am definitely a fan of classic boat lines and love when they are incorporated into modern building. The modern trend of the fat high sided bulky house cottage on the water boat is not my favorite type.
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Old 02-12-2016, 02:39 PM   #300
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Re TAD's "efficient motor yacht" she looks like a sailboat to be sure. Reminds me of the days where I was thinking of making a trawler out of a sailboat hull. Bought the Willard before that happened.

My kind of boat .. twin engine Full displacement. However I don't even drool over boats this big. That formula won't get more than two cylinders in a small boat. Can you imagine syncing two two cylinder engines?
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