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Old 12-08-2012, 10:07 PM   #121
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oil screw???............geezzz...there are a few gas counter rotating twin screws out there and a few single oil screw twin engine vessels also. This can go on and on
Got any pictures of one of these????
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Old 12-08-2012, 10:50 PM   #122
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Perhaps he's talking about the "geared up" drive system where there is a single engine on C/L geared to twin screws in typical locations. There was an article on a Mainship 34 that had been converted some years back. Haven't heard of it since so it must have failed in the market place. Since redundancy is the main reason to have twin screws twin screws w only one engine probably made people ask "what's the point?".
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Old 12-08-2012, 10:53 PM   #123
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Got any pictures of one of these????
Here you go, the starboard engine of a pair of British Polar medium speeds driving a CP propeller via a combining gearbox.

You can see the gearbox in the background ...
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Old 12-08-2012, 10:57 PM   #124
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Did you miss "MOST"?
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Old 12-08-2012, 11:23 PM   #125
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Got any pictures of one of these????
that be a volvo diesel duoprop DPH Duoprop - DPH Duoprop : Volvo Penta
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Old 12-08-2012, 11:59 PM   #126
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... a few single oil screw twin engine vessels also. ...
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Old 12-09-2012, 06:07 AM   #127
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Perhaps he's talking about the "geared up" drive system where there is a single engine on C/L geared to twin screws in typical locations. There was an article on a Mainship 34 that had been converted some years back. Haven't heard of it since so it must have failed in the market place. Since redundancy is the main reason to have twin screws twin screws w only one engine probably made people ask "what's the point?".
Eric, I saw that boat at the Mainship factory in St. Augustine. In my opinion it was the worst of both worlds. It handled like a twin screw, but with the engine redundancy of a single screw. It had the economy of a single engine, but no prop protection as in a twin screw. I think the designer was focused on one aspect and forgot the others.
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Old 12-09-2012, 07:46 AM   #128
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And who can forget GM's twin, tandem, and quad versions of the 6-71, all burning oil and driving a single screw?

Not to mention the USCG Balsam class, Juniper class, and Bay class boats.

All "single oil screw twin engine vessels"
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Old 12-09-2012, 08:12 AM   #129
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And who can forget GM's twin, tandem, and quad versions of the 6-71, all burning oil and driving a single screw?

Not to mention the USCG Balsam class, Juniper class, and Bay class boats.

All "single oil screw twin engine vessels"
just never saw that designation....but I know the configurations you are mentioning...it's just the combination of descriptors that I'm not sure fits the way the vessel classifiers normally do it.

USCGC Balsam - Propulsion: 1 electric motor connected to 2 Westinghouse generators driven by 2 Cooper-Bessemer-type GND-8, 4-cycle diesels; single screw..

pretty sure when the "motor" is electric it's a different designation but can't remember...


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Old 12-09-2012, 09:38 AM   #130
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It's a boat. "What kind of boat?" A power boat. "What kind of power boat?" (in my case) It's a 56 foot long cabin cruiser..

In my case I often say "fat, old & slow." - My ex thought I was speaking of myself.
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Old 12-09-2012, 09:52 AM   #131
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...To refer to a Boat used for pleasure with NO trawling gear what so ever aboard as a “Trawler” is simply incorrect ...........
It's ony incorrect in your mind. And a few others, I suppose.

Language changes over time and you either get with the program or you roll over and fade away. A good example:

Fifty years ago, the word "gay" meant someone who was happy. If you are happy today, would you tell folks you are "gay"?

Technically, the big iron thing that propels a car in an "engine", not a "motor", yet every state has a "Deparment of Motor Vehicles" or some variation on that name. I've never seen a "Department of Engine Vehicles"!

So my boat is a "Trawler". It was built and marketed as a Trawler. When people ask what kind of boat I have, I tell them it's a "Trawler".
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Old 12-09-2012, 10:33 AM   #132
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It's ony incorrect in your mind. And a few others, I suppose.

Language changes over time and you either get with the program or you roll over and fade away. A good example:

Fifty years ago, the word "gay" meant someone who was happy. If you are happy today, would you tell folks you are "gay"?

Technically, the big iron thing that propels a car in an "engine", not a "motor", yet every state has a "Deparment of Motor Vehicles" or some variation on that name. I've never seen a "Department of Engine Vehicles"!

So my boat is a "Trawler". It was built and marketed as a Trawler. When people ask what kind of boat I have, I tell them it's a "Trawler".
If EVERY "power boat" becomes designated simply as a "Trawler", all lumped into one category, then the line of definition/distinction becomes very blurry. There are different styles of boats, i.e. designation names for models and types of craft. IMO, "Pleasure Trawler" is more befitting our crafts' general style and usefulness/usability... than just using the term Trawler.... which by definition and history connotes the meaning of a working class fishing-trawler.

BTW... I'm often asked what size "motor" (and sometimes the word engine gets used) is in my 1967 Buick Wildcat muscle car! Also, the word "Motor" is used as an abbreviation of "Motorized" per Department of Motor Vehicles... because that govt department takes care of registration and other items for ALL types of motorized (not enginized) vehicles.

You have a Motor Boat - or an Engine Boat? Here again the word motor is an abbreviation of "Motorized".

What type of motors, or, what type of engines do you have in your boat? And: I have twin diesel motors, or, twin diesel engines in my boat. Therein for those sentence usages the two words become synchronized in meaning.
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Old 12-09-2012, 12:02 PM   #133
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134 posts and still no consensus on how many "trawlers" can dance on the head of a pin?

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Old 12-09-2012, 12:09 PM   #134
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134 posts and still no consensus on how many "trawlers" can dance on the head of a pin?

Depends if the "Trawlers" have nets out... or not!
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Old 12-09-2012, 12:40 PM   #136
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Who said Heavy Cruiser? This is a heavy cruiser.
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Old 12-09-2012, 01:15 PM   #137
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134 posts and still no consensus on how many "trawlers" can dance on the head of a pin?

angus, see my post #118. I'll stand by that.
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Old 12-09-2012, 01:24 PM   #138
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angus, see my post #118. I'll stand by that.
Don - When we successfully mechanize hydrocarbon, recyclable liquid fuel opportunities from efficiently separating atmospheric CO2 on a global scale (scientifically termed DAC, i.e. Direct Air Capturing)... our crafts could then be called "Screw-Oil Boats!
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Old 12-09-2012, 01:31 PM   #139
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Don - When we successfully mechanize hydrocarbon, recyclable liquid fuel opportunities from efficiently separating atmospheric CO2 on a global scale (scientifically termed DAC, i.e. Direct Air Capturing)... our crafts could then be called "Screw-Oil Boats!
Can't wait for that to happen, Art. When it does I'll be dancing too.
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Old 12-09-2012, 01:56 PM   #140
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Can't wait for that to happen, Art. When it does I'll be dancing too.
Don - Thanks for encouragement.. But... don't hold yer breath, Big Oil Companies have a VERY heavy foot print to get out from under! They basically own the U.S. and other govts' funding capabilities regarding the "New-Source" energy field. Cause, they own many, many of the top politicians. It will be interesting to see the fireworks in the energy field throughout the next 10 years as Climate-Change becomes a scary topic. Also, WTF is gonna happen with finance and markets when 1/1/13 passes by??? Annie get cha gun?!?!
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