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Old 04-05-2017, 03:24   #706
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Re: Oceanvolt Hybrid Motor

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This is, however, a fairly unique case. It is not a cruising boat, it is a racing boat, and I doubt Tony will ever take is over 200nm offshore. .
Thats news to Karen, Tony's better half, she is planning many a grand voyage on it.

Kato is stunning and very comfortable cruising boat for a couple.
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Old 04-05-2017, 04:52   #707
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Re: Oceanvolt Hybrid Motor

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What would impress you?

How about Tony going out of Manly with batteries at 50% SOC, cruising for 3 days and 2 nights, never running the genset, and returning to Manly with batteries full? Would that impress you?

It impressed Tony, but hey, what would he know,eh?

Not a drop of diesel used, all power courtesy of solar and the OceanVolt regeneration while sailing.
You really get worked up don't you?

6 knots at 3 litres per hour from a $70,000 propulsion systems doesn't impress me. I get better than that from a $6000 20 HP Honda.

Maybe it excites you, that's fine.

The rest? Well, in the right weather we could do that using maybe a litre of petrol...
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Old 04-05-2017, 04:55   #708
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Re: Oceanvolt Hybrid Motor

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And they could have directed all 8kW to one motor for the same result, but there is no need to do that because, unlike your diesels where you want to minimise use to delay maintenance tasks and costs, the electrics have virtually no maintenance for a long, long time, like 10 years or so.

The 8 kw was coming from a diesel genset right?
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Old 04-05-2017, 05:59   #709
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Re: Oceanvolt Hybrid Motor

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With 1650W of solar power and hydro-generation on a fast sailing boat cruising day and night? I'd be distinctly UNimpressed if that didn't keep the batteries up. What has that got to do with the pros and cons of EP?
You may find that, sooner or later, you will be passaging and half the day will be dark. And you never know, it might even be cloudy during the day, maybe even raining for a few days.

And if you have a Watt & Sea hydrogenerator, say their super duper 600 Cruise, you will be getting a whopping 260 watts at 7.5 knots boat speed. If you are lucky enough to be zooming along at 10 knots, you'll get about 500 watts, their maximum.

On the other hand the regen you would get from the OV OV SD15 Servoprop would be 1,500 watts at 7.5 knots ( 6 times as much), 3,000 watts at 10 knots, and unlike the Watt & Sea that max's out at 10 knots, the SD15 Servoprop regen just keeps going up. At 12 knots there will be about 4.5kW PER MOTOR !

That is a fair amount of useable power, in fact, more than many would get from a genset running.

I think that's pretty cool, but I guess it takes a bit to get you excited.
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Old 04-05-2017, 14:36   #710
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Re: Oceanvolt Hybrid Motor

This would all be more impressive
If the price weren't so excessive!
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Old 04-05-2017, 15:18   #711
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Re: Oceanvolt Hybrid Motor

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This would all be more impressive
If the price weren't so excessive!
Da mans a poet
An he don't even know it!
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Old 04-05-2017, 16:10   #712
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Re: Oceanvolt Hybrid Motor

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Originally Posted by BigBeakie View Post
You may find that, sooner or later, you will be passaging and half the day will be dark. And you never know, it might even be cloudy during the day, maybe even raining for a few days.

And if you have a Watt & Sea hydrogenerator, say their super duper 600 Cruise, you will be getting a whopping 260 watts at 7.5 knots boat speed. If you are lucky enough to be zooming along at 10 knots, you'll get about 500 watts, their maximum.

On the other hand the regen you would get from the OV OV SD15 Servoprop would be 1,500 watts at 7.5 knots ( 6 times as much), 3,000 watts at 10 knots, and unlike the Watt & Sea that max's out at 10 knots, the SD15 Servoprop regen just keeps going up. At 12 knots there will be about 4.5kW PER MOTOR !

That is a fair amount of useable power, in fact, more than many would get from a genset running.

I think that's pretty cool, but I guess it takes a bit to get you excited.
You can buy a lot of Watt & Sea's for $70,000.

You still haven't told us what your article has to do with the pros and cons of Electric Propulsion.
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Old 04-05-2017, 17:43   #713
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Re: Oceanvolt Hybrid Motor

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You can buy a lot of Watt & Sea's for $70,000.

You still haven't told us what your article has to do with the pros and cons of Electric Propulsion.
What rubbish! An OceanVolt SD15 cost is about USD$14,000, so yes somewhat more than an equivalent marine diesel, but by all means feel free to toss around rubbish figures to try to justify your case.

Yes, for $70,000 you could buy 10 Watt & Sea 600's since they are USD$7,000 each. And you would HAVE to buy 6 of them (and figure out how to mount that many- good luck with that) to equal the regen power output of a single OV SD15.

So, you'd spend 6 x $7,000=$42,000 which is 3 times the cost of the OceanVolt SD15 !

And tell me, exactly how much Propulsion would you get from the 6 Watt & Sea 600's???
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Old 04-05-2017, 17:49   #714
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Re: Oceanvolt Hybrid Motor

54 hp Yanmar 4JH 5E with sail drive costs $19,000 AUS.
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Old 04-05-2017, 18:19   #715
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Re: Oceanvolt Hybrid Motor

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54 hp Yanmar 4JH 5E with sail drive costs $19,000 AUS.
Yep, and $19,000 Oz is $14,071.40 US. I was using USD figures.

But to be correct the OV SD15 is not equivalent to a 54HP, it is roughly equivalent to a 45HP diesel and by equivalent I'm talking about equivalent thrust, which is what matters.

Both have a thrust in the order of 320kgf at full power, if my sources are correct.

So, for USD$14,000 you could buy 2 Watt & Sea 600 hydrogenerators, or 1 OceanVolt SD15. But with the OceanVolt you would get 3 times the battery charging power AND silent, instant, sweet smelling, propulsion. Also virtually no maintenance, far superior dockside manouverability, ......and so forth.

Now, what was that about, "What are the benefits of electric propulsion?
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Old 04-05-2017, 18:22   #716
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Re: Oceanvolt Hybrid Motor

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What rubbish! An OceanVolt SD15 cost is about USD$14,000, so yes somewhat more than an equivalent marine diesel,
The trouble is, this $14,000 motor is pretty much useless on it's own.
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Old 04-05-2017, 18:29   #717
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Re: Oceanvolt Hybrid Motor

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Yep, and $19,000 Oz is $14,071.40 US. I was using USD figures.

But to be correct the OV SD15 is not equivalent to a 54HP, it is roughly equivalent to a 45HP diesel and by equivalent I'm talking about equivalent thrust, which is what matters.

?
Thrust at what speed?

Static thrust is meaningless. You could fit huge diameter, low pitch props and get very high static thrust, but this would be useless for propulsion purposes.
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Old 04-05-2017, 18:57   #718
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Re: Oceanvolt Hybrid Motor

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The trouble is, this $14,000 motor is pretty much useless on it's own.
"YOU CAN'T BE SERIOUS!"

Conrad Coleman in the Vendee Globe didn't think it was "pretty much useless", did he? It kept him powered through the entire race, and in spite of all the other difficulties he had, power availability was not one of them.

It worked perfectly for the entire race, unlike Watt & Seas that packed up ( which is why they carry a spare), and, dare I say it, several DIESELS that misbehaved.

Keep your eye on how many Vendee Globes install OceanVolt SD15 Servoprops next race.
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Old 04-05-2017, 19:01   #719
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Re: Oceanvolt Hybrid Motor

Don't give in BB! I've been away from the forum for a while, sporadically checking in. Was wondering if you ever decided to build a FF46
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Old 04-05-2017, 19:03   #720
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Re: Oceanvolt Hybrid Motor

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Thrust at what speed?

Static thrust is meaningless. You could fit huge diameter, low pitch props and get very high static thrust, but this would be useless for propulsion purposes.
Thrust at full power speed, depends on the boat (hull resistance) what that speed value is.
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