Interesting boats

[RT Firefly]

Greetings,
Mr. d. Agreed. That forward central space is perfect for a navigational suite. Alas, no pictures of the ER(s). Such a large saloon space that was ruined by allowing interior designers on board. As mentioned, poor galley set up.

 

[Kit_L]

That cat looks good to me, but I have mede it a rule to never look further at any vessel if there are no engine room images; ditto with batteries and representative wiring!

I do like the smaller engines and 1.1nm/litre @ 15kn seems truly excellent to me.

 

[OldDan1943]

I totally agree with you on everything except the engine size, depending upon engine access.
It is nice to have the extra speed even if you dont use it.
I am old and dont fold up as I did when younger soooo, I like easy access to the engines for maintenance.
I have a Cummins 380 and can top out about 17 knots but at significant greater fuel consumption so I figure if I can run at hull speed for everyday usage, stretching my fuel and distance. Save the fuel and speed for racing the tide through an inlet if necessary.

 

[socalrider]

That mileage seems too good to be true, no?

 

[Kit_L]

No, I think it's about right (small engines, light, easily driven hulls). There are a number of Gardner powered fishing boats around here that get 1 litre/nm, but of course, they travel at under hull speed. It's possible, at least.

 

[Art]

No, I think it's about right (small engines, light, easily driven hulls). There are a number of Gardner powered fishing boats around here that get 1 litre/nm, but of course, they travel at under hull speed. It's possible, at least.

Current combo for increased nmpg at faster speeds: Light as possible boat weight, designed less hull to water contact as possible with smooth clean bottom as possible - mated to most efficient engine / prop as possible.

It's all physics.

Now think about this... If there is a way to design injected air sheet through/under and between entire boat bottom material and the water... well then - friction coefficient of water to bottom material surface would become the friction coefficient of air to bottom material surface. In other words... the boat would be "flying" over the water. Imagine nmpg capability that would enable!!

 

[long-cours.62]

For our Long-cours 62

No, I think it's about right (small engines, light, easily driven hulls). There are a number of Gardner powered fishing boats around here that get 1 litre/nm, but of course, they travel at under hull speed. It's possible, at least.

The 1nm per liter could be done at only 7.6kts it means at only 73% of the hull speed.

 

[socalrider]

The 1nm per liter could be done at only 7.6kts it means at only 73% of the hull speed.

Yeah I'd buy 1.1l/nm at 7kts for the Schionning power cat, but at 15 that sounds very low. Maybe per engine?

 

[long-cours.62]

1.1lt at 15 kts 16.5lt = around 88 hp


A mono hull of 4T and 11 m lw will need around 110/120 hp to reach 15 kts...

 

[long-cours.62]

minimalist !


https://www.elburgyachting.nl/sp/yachts/6181/details_en.html?t=5AlDrp8

 

[Art]

https://www.elburgyachting.nl/sp/yachts/6181/details_en.html?t=5AlDrp8

I didn't notice range, speed or recharge time span.

 

[long-cours.62]

the diesel one here

https://www.pogostructures.com/fiche-bateau/loxo-32/?lang=en

 

[Drako]

Now think about this... If there is a way to design injected air sheet through/under and between entire boat bottom material and the water... well then - friction coefficient of water to bottom material surface would become the friction coefficient of air to bottom material surface. In other words... the boat would be "flying" over the water. Imagine nmpg capability that would enable!!

That's what stepped hulls are trying to do on fast boats. I haven't seen it on displacement boats, though.

 

[Art]

That's what stepped hulls are trying to do on fast boats. I haven't seen it on displacement boats, though.

I understand that... for really fast speed boats.

But - What if??... a larger boat's hull shape was designed to capture air bubbles as it travels forward; and, a major volume air pump was to force air through hull holes to place ongoing thin air divide between water surface and surface of boat bottom. Friction cold be greatly diminished.

I'm way too busy to follow this thought any further. But... What if??

 

[backinblue]

I didn't notice range, speed or recharge time span.

Google makes me smarter!

Pogo Loxo 32 Electric - Oceanvolt

 

[Art]

Google makes me smarter!

Pogo Loxo 32 Electric - Oceanvolt

Putting boat year manufactured, performance capabilities, comforts, and costs in perspective:

New Loxo 32 electric cruiser...

"For the Loxo 32 electric cruiser, the companies decided on twin 15kW Oceanvolt motors coupled with a 53.2kWh lithium battery package. The boat can plane at 8 knots (15 kmh / 9 mph), and at that 8 kt speed has a range of 60 NM (110 km /60 mi). Maximum speed is 14 kts (26khm / 16mph). One of the keys to the performance is the light weight – only 1800 kg/ 3975 lbs." Boat Cost - 100's of thousand $$$ Boat Accommodations - Cramped at best. Recharging time - Over night span. Recharging Cost - $50 to $75...???

Our 1977 Tollycraft 34 tri cabin cruiser...

Twin 350 cid, 255 hp, 200 gals fuel. Calculated displacement cruise speed max 7.58 knots. Figured on slack tide: Cruising at 4.5 to 5 knots on one engine = 480 miles with 20% of safety fuel remaining in tanks. Cruising at 6.5 to 7 knots = 320 miles with 20% of safety fuel remaining in tanks. At planing cruise speed 16 to 17 knots - 160 miles with 20% of safey fuel remaining in tank. Maximum speed 22 to 23 knots. Loaded boat weight 21K lbs. Boat Cost - $45K +/-. Boat Accommodations - Fully equipped and comfortable as a small house. Refueling Time - 45 minutes. Refueling cost - 160 gallons at 5.00 per gal - $800.

Bottom line... IMO: Electric boats simply do not yet have the range capability nor recharging schedule-time to become fully active as a large market sector for pleasure boats.

 

[brian eiland]

Greetings,
NOW we're talkin'! Multi-hulls. To paraphrase George Orwell (Animal Farm 1945) "Two hulls good. One hull bad."

How about this one that one old friend built, and another old friend owned. I really liked this vessel,...


https://www.trawlerforum.com/forums/showpost.php?p=174025&postcount=1


...what a great aft deck,..

 

[brian eiland]

a few other power cats over here,..
https://www.trawlerforum.com/forums/s70/powercat-trawlers-11299.html

 

[OldDan1943]

Interesting boat but too much white plastic inside. Never fear, one can glue up as much teak or other wood as the buyer wants.

 

[JWellington]

Bottom line... IMO: Electric boats simply do not yet have the range capability nor recharging schedule-time to become fully active as a large market sector for pleasure boats. [/QUOTE]

Art, re your bottom line.....There seem to be some that do have the range capability...Zen 50, Silent Yachts, Alva Yachts.

 

[OldDan1943]

I would go first to a hybrid boat.

 

[hollywood8118]

Electric "power" cruising boats are still in the gimmick phase. I bet they are at least 20 years behind electric cars when it comes to true mass market use. Don't get me wrong, I think the idea of renewable energy is a good one, but there is 0 infrastructure to fast charge boats and will not be for a long time. Sailing cats seem to be making progress towards hybrid tech and that platform makes sense. I am on the list for two different electric trucks, hummer and the chev silverado. in most daily use they can work for me.. right to the point I want to tow something. Yes they have the power, but the range drops to nothing with a load behind them. There is a real world test that shows a 200 mile standard range f-150 that dropped to like 68 miles with a box trailer behind it. I just returned from a cross the US road trip with one of my kids in a small SUV that typically gets 30MPG that was down to 18mpg with a small uhaul trailer. I cannot Imagine trying to cross the US in a vehicle that had even less range and needed to be charged every 60 miles. Some big advancement will need to take place for large consumer vehicles to make it possible for electric to make an impact for a large portion of this country to be able to use electric.

HOLLYWOOD

 

[RT Firefly]

Greetings,
Mr. be. Thanks (sorta) for sending me down that rabbit hole (post #12257). I read through all 14 pages (whew)! One thing I may have not noticed is mention of symmetric vs asymmetric hull designs. From what little I understand, symmetric hulls are the slower of the two.


My enthusiastic simian image was in reference to our future purchase of a "sport" catamaran BUT I did find the thread quite interesting.

 

[CaptKirk]

The boat you are referring to back in November i believe is the same vessel I purchased in July. The YachtWorld link doesn’t work anymore.

 

[JWellington]

Electric "power" cruising boats are still in the gimmick phase. I bet they are at least 20 years behind electric cars when it comes to true mass market use. Don't get me wrong, I think the idea of renewable energy is a good one, but there is 0 infrastructure to fast charge boats and will not be for a long time. Sailing cats seem to be making progress towards hybrid tech and that platform makes sense. I am on the list for two different electric trucks, hummer and the chev silverado. in most daily use they can work for me.. right to the point I want to tow something. Yes they have the power, but the range drops to nothing with a load behind them. There is a real world test that shows a 200 mile standard range f-150 that dropped to like 68 miles with a box trailer behind it. I just returned from a cross the US road trip with one of my kids in a small SUV that typically gets 30MPG that was down to 18mpg with a small uhaul trailer. I cannot Imagine trying to cross the US in a vehicle that had even less range and needed to be charged every 60 miles. Some big advancement will need to take place for large consumer vehicles to make it possible for electric to make an impact for a large portion of this country to be able to use electric.

HOLLYWOOD

Why are the three I mentioned....gimmicks? Zen 50, Silent Yachts, Alva Yachts.

 

[Adopo]

This looks like a well built boat. Something about the windows I don't like. I like being able to see out when sitting?

https://www.yachtworld.com/yacht/2002-darling-yachts-custom-aluminum-8383310/

 

[Adopo]

a few more...

 

[Adopo]

Heres the other thing, I think it just shows 2 of the staterooms, where are the others?

Accommodations

Single Berths
3

Double Berths
2

Cabins
5
Heads
2

 

[socalrider]

Heres the other thing, I think it just shows 2 of the staterooms, where are the others?

Accommodations

Single Berths
3

Double Berths
2

Cabins
5
Heads
2

That looks like a great family expedition boat - wife would love all the cabins; she's constantly frustrated by larger boats with only 2-3.

Agree the pilothouse windows aren't the prettiest. The topsides remind me of a reviewer's comment on the Volvo 240 - looks like it was designed with an etch-a-sketch.

I'd still love to own her!

EDIT: I'm pretty sure that's a 2-stateroom vessel. Never mind!

 

[Adopo]

That looks like a great family expedition boat - wife would love all the cabins; she's constantly frustrated by larger boats with only 2-3.

Agree the pilothouse windows aren't the prettiest. The topsides remind me of a reviewer's comment on the Volvo 240 - looks like it was designed with an etch-a-sketch.

I'd still love to own her!

EDIT: I'm pretty sure that's a 2-stateroom vessel. Never mind!

Right? That's what I am trying to figure, why the 5 cabins? And why a boat that size with two staterooms unless it was for a couple and a captain/crew.