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Old 08-20-2013, 10:51 AM   #21
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I'm glad you brought up the Domino 20 powercat.

If you really want to have some fun go visit their BlogSpot
DOMINO 20

....and take a look at some of the total distances they have covered from their building place in South America, up thru the Caribbean, up and back down the East Coast of the USA, down Central America, and now holding over in Panama waiting for the next big journey out thru the Pacific.

This is an ocean going powerboat.
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Old 08-20-2013, 10:59 AM   #22
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Domino 20, Expenses of Cruising

You might find these budget matters interesting as well

...happened across this well documented example of expenses associated with full-time live-aboard cruising by a couple who built their own vessel "Domino" down in South America, and are out there cruising full time...and keeping a very nice public log of the adventure.
Expenses of Cruising; Budget Examples - YachtForums.Com
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Old 08-20-2013, 11:37 AM   #23
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Quote:
Originally Posted by brian eiland View Post
Lets take that first cat I started the subject thread with. The builder/original owner did NOT want to travel at monohull displacement speeds. So he put two 210 HP Cummings engines in it.

He traveled Palm Beach out to the Abacos in 5.5 hrs at a steady 18 knots, 2100 rpm. He burned 90 gal of fuel on that trip.

So that's about 1 nmpg at 18 knots, or 1.6 gph

If he chose to knock it back to 12 knots of speed, he figures he would double those figures,....2 nmpg or less than 1 gal per hour.

That's pretty economical cruising.
But load him up with what a lot of us cruisers want to carry on board...then run the numbers...sure 62 feet can carry a lot for a couple or several...but the 62 foot equivalent mono with average number of staterooms...plus all the liveaboard/cruising goodies and toys...the cat can't usually do it.

Plus fit and finish..ever see a cat with granite counters, porcelain sinks/toilets, etc...etc...??? Most of them are glass and plastic finish for a reason.

No one argues the few advantages cats have....what about the disadvantages???? How about addressing them.
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Old 08-21-2013, 12:41 AM   #24
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Here is a pretty good example of a sail assisted power cat.
An excellent cruising boat.
52' Passagemaker By Peter Brady: Sailing Catamaran for Sale | Composite, Cedar Strip Plank And Epoxy Sail Boats | Boats Online | Queensland (Qld) - Qld

Peter Brady is a well respected cat designer here in Australia.
Cheers
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Old 08-21-2013, 12:52 AM   #25
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Catbird Suite

An interesting passage maker over in your area is this vessel Catbird Suite

DAMSL Catbird Suite

The owner has done a LOT of experimenting with various propulsion ideas including an air prop.

His catamaran is really more of a sailor than sail-assisted powercat
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Old 08-21-2013, 05:12 AM   #26
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Economical cruising means different things to different people. Bay Pelican, a single engine Krogen 42, gets 3 + nautical miles per gallon at 7.8kts and 5-6 nautical miles per gallon at 6.3 kts. We routinely go at 6+ kts just to save the diesel. In an 80 nm trip the 12 or 13 gallons saved versus 7.8kts pays for dinner out.

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Old 08-29-2013, 10:41 AM   #27
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Sail-Assisted Power Cats

I had forgotten all about this posting:
Motor & Sailing Vessels (MotorSailer) - Page 2 - YachtForums.Com

Couple of good photos of some other multihull vessels
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Old 08-30-2013, 06:40 AM   #28
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Im having a hard time following this math,

>He traveled Palm Beach out to the Abacos in 5.5 hrs at a steady 18 knots, 2100 rpm. He burned 90 gal of fuel on that trip.

So that's about 1 nmpg at 18 knots, or 1.6 gph

If he chose to knock it back to 12 knots of speed, he figures he would double those figures,....2 nmpg or less than 1 gal per hour.

That's pretty economical cruising. <

90 gal burned in 5.5 hours is 1.6 GPH????

Me thinks a decimal is misplaced and 16 GPH is a closer answer

What is economical about cruising at $75 an hour, or $4.50 a mile??
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Old 08-30-2013, 08:42 AM   #29
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Quote:
Originally Posted by brian eiland View Post
Lets take that first cat I started the subject thread with. The builder/original owner did NOT want to travel at monohull displacement speeds. So he put two 210 HP Cummings engines in it.

He traveled Palm Beach out to the Abacos in 5.5 hrs at a steady 18 knots, 2100 rpm. He burned 90 gal of fuel on that trip.

So that's about 1 nmpg at 18 knots, or 1.6 gph

If he chose to knock it back to 12 knots of speed, he figures he would double those figures,....2 nmpg or less than 1 gal per hour.

That's pretty economical cruising.
Sorry, as FF has pointed out I got the decimal point wrong.

It was 90 gal per 5.5 hrs = 16.4 gal/hr at 18 knts
That's 1.1 nmpg

According to the article that is estimated to double at 12 knts of speed...
2.2 nmpg

I'll have to see if I can find an updated fuel burn from the current owner.

Sorry for that mistake.
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Old 08-30-2013, 08:48 AM   #30
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Quote:
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I'll have to see if I can find an updated fuel burn from the current owner.
I do love how gmail lets you find old emails so easily.

The owner reports, "Going about 19-20 knots we burn about a gallon a mile, and at 9-10 knots we burn about a gallon every three miles."
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Old 09-17-2013, 04:04 PM   #31
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Unfinished 65' Powercat

I almost forgot this one....

65' Power Catamaran - $175,000 - The Hull Truth - Boating and Fishing Forum

This is a 'blank page' that could be turned into something real nice.
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Old 09-17-2013, 07:26 PM   #32
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Thanks for the link. Yes, a very interesting boat and conversation about it. If money were no object and I was single, I'd buy that, stay in the Bahamas, live aboard, and make that boat my project doing one thing at a time. The guy has realistic objectivity about his amidships outboard application, but if I ever did outboards, it'd have to be diesel units on the stern. Since he says you need 14 knots to plane and could get near 20 knots with twin 215's (and 3mpg at 8 knots), I'd probably go back with similar diesel power that he has now. I wonder what it weighs.
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Old 10-12-2013, 12:05 PM   #33
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There is a 2 day old forum for owners and interested parties in the Motorcat line of power catamarans. Unlike the PDQ, Endeavor, Glacier Bay and others, this boat is designed and built in Poland and is the lightest and most efficient hulled power catamaran on the market. It will achieve 20 kt on just a pair of 50 hp outboards and will be comfortable in off shore conditions. I'm interested is this boat because its design lends itself to diesel-electric propulsion with solar assist.

Here is the brand new forum Motorcat Owners Group &bull; Index page

If you are into trailerable off shore capable power cats, the offerings are increasing due to their economy of operation.
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Old 10-12-2013, 04:01 PM   #34
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Thanks for that link, Bob....I didn't know. Actually, I had mentioned the Motorcat to you along with the Aspen as a pretty good candidate for solar-electric. There was actually a UK test of the Motorcat that netted a 10 knot cruise from two 10 HP outboards....very efficient and slippery. You probably know that Motorcat also developed an enclosed pilothouse version. Two of my friends have Motorcats, one of which has now built an enclosed pilothouse totally unlike the factory version. He was about to splash it last time we talked, but I'm really curious about this for the same reasons you might be. If the pilothouse version trims well, a roof for solar (similar to Greenline) or even something in the line of Reubin's boat could be adapted. Kris Czerwonka at Bond Yachts Marketing e-mails updates on builds and developments. I think this is a company that one could work with in a special build. The relatively narrow beam may even lend itself to a asymmetrical or sail-drive type drive.
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Old 10-12-2013, 04:21 PM   #35
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I just want to cruise on the cheap and not deal with sails and rigging. Is that too much to ask? The one advancement that makes this possible is the LiFePO4 cells and their capabilities and last year's major price reduction. My lithium cells continue to amaze me, when not powering my electric kayak 80 miles on a charge they are cooking my steaks on a 1500 watt electric BBQ. I'm doing this just to get as many cycles in as I can. 64 lbs of these cells power the BBQ for 100 minutes which is 5 uses. Still no reduction in capacity and I BBQ 3 to 4 times a week.
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Old 10-12-2013, 09:15 PM   #36
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All kinds of data on their site, but no pricing. Anybody have a clue as to prices?

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Old 10-12-2013, 09:37 PM   #37
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$125K~$150K new.

Yachtworld.com Boats and Yachts for Sale
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Old 10-29-2013, 05:16 AM   #38
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One for the Gardner lovers



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Old 10-29-2013, 06:00 AM   #39
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While we are on the subject.....

This was a 60ft Powercat that I had lusted after for quite some time. Absolutely beautiful boat capable of cruising in the 20s with a 30+ WOT. I know one of the guys on the boat. He said it split right down the middle of the bridegdeck. I never would have expected that result based on what the boat looked like. It was beautiful and "appeared" very well built. This happened about 3 weeks ago....

Coast Guard rescues 12 from Gulf of Mexico after catamaran sinks - KLTV.com-Tyler, Longview, Jacksonville, Texas | ETX News
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Old 10-29-2013, 08:34 AM   #40
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Baker

I can't say that all cats are alike but what you have just posted is the perception I have about a cruising cat sailing at 30 knts. People get enthusiastic and they loose their judgment capacity in face of the sea conditions. Yes cats and other boats can cruise at high speeds, but speed is something that needs to be hand in hand with other factors. Like monohulls, the cats are also qualified as planning, displacement hulls and whatever is in the middle. That means that not all cats are meant to run at 30 knts. At that point, starts the bad judgment.

What you have written above is exactly what happen in the Arabian Gulf 5 or 6 years ago with a multimillion dollar cat. At 30+ knots she just split in half. Nobody died.

I fear the capacity of those things, and perception is 90% of reality.
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