ePropulsion

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    Posted: 08 Jul 2020 at 1:23pm
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"The sea, once it casts its spell, holds one in its net of wonder forever." - Jacques Cousteau
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Post Options Post Options   Likes (0) Likes(0)   Quote Reel Deal Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jul 2020 at 8:28pm
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The future right there!!
Light outboards, batteries getting lighter less than full tank of fuel, and can do many hours on one charge - this plus solar recharge. Imagine clipping your boat on car or untying launch from berth knowing you have full tanks for free, huge range and better performance.

Link below offerS 150-200HP equivalent options 


The gods do not subtract from the allotted span of men's lives the hours spent on fishing - Assyrian Proverb
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Post Options Post Options   Likes (0) Likes(0)   Quote brmbrm Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jul 2020 at 9:25pm
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I can't see (or don't understand) data regarding (a) power output and (b) hours available on full charge.

How does this pan out for say 60 HP motor?  What would battery weight and hours/mileage on a full charge be?

If I was repowering electric would be really attractive option.   If $$$ sensible.

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Post Options Post Options   Likes (2) Likes(2)   Quote whippersnappyr Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2020 at 9:55am
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Its all BS.  The motor weighs 150kg, they conveniently don't mention the space, the weight and the cost of the batteries you'll need.
The energy density of batteries is so low that there is no practical solution for electric engines in boats other than little tenders.

Even hybrid things like the Greenline 40 will do about 4 knots on electric for about 3 hours so a range of 12NM going at a crawl. So essentially useless for anything other than niche uses like a river boat.

Just for fun let's do some quick math on the 150hp outboard.  It is 90kW nominal so at cruise it will deplete a 90KWh battery in an hour. The 85kwh battery pack in a Tesla weighs 540kg.

So you have a powertrain weighing 700kg plus.  You have an endurance of 1 hour at cruise (imagine this engine on say a Haines Hunter SF600 maybe 25knots at its nominal power).

So you have an engine that:

- Weighs 700kg (the full weight all the time)
- Goes about 25NM and then is completed depleted at planing cruise speeds.
- Will then take 2 -10 hours to charge and obviously can't be done on the water
- Based on the current premiums of tender electric motors vs outboard will costs 2.5-3x the price of a petrol outboard.

So in summary, not for me.
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Post Options Post Options   Likes (0) Likes(0)   Quote brmbrm Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jul 2020 at 5:41pm
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Thanks W- waiting on battery technology really
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Post Options Post Options   Likes (0) Likes(0)   Quote Catchelot Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2020 at 10:33am
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Post Options Post Options   Likes (0) Likes(0)   Quote Catchelot Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2020 at 10:35am
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I like this one a foiling run about.Clap

"The sea, once it casts its spell, holds one in its net of wonder forever." - Jacques Cousteau
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Post Options Post Options   Likes (0) Likes(0)   Quote MATTOO Quote  Post ReplyReply Direct Link To This Post Posted: 19 Jul 2020 at 5:26pm
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W is on to it.

But the beauty here is there are those prepared to put there hands in there pockets to develop this technology.

That's the exciting part.
As we humans keep developing the rest of us win.

Thank people for glass half full thinking.

Praise human endeavours.
Just cruising in my now sweetas pimped out Southern 755 HT0!
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Post Options Post Options   Likes (0) Likes(0)   Quote Schampy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 6:47am
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Originally posted by Catchelot Catchelot wrote:

I like this one a foiling run about.Clap


Thats bloody awsome. Its only a matter of time before small foiling hulls are pretty mainstream I recon. Way of the future.  
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WS number crunching is on to it...
 Based o WS number etc which look pretty much well thought thru and correct....

Around the 25kn (28mph well powered)  But...that is for around a 200 hp and normal engine/fuel weight.
Now add the difference in weight between a normal engine setup and the electric setup to the gross weight on the water, then suddenly the power requirements (and weight of the electric system becomes far bigger.
 Or stay at the std well powered 200/225hp and the cruise speed and hole shot falls away dramatically.

It will take around 85 to 90hp (approx 70kw) of the 200hp engine to cruise at 28 mph.
Add another 700kg to the boat weight, you now need approx 130hp to cruise at 28mph....
note: the extra weight will drop the hulls friction constant down an estimated 5 to 7 points in the calculations.

Now this is all well and good on flat water, get a bit of chop the HP requirement for standard engine is around 10 to 15%...min
So now to be practical looking around 150hp 115Kw min at cruise.

Now the battery..A 14kwh tesla only has approx 5kw max output. now things move in to the nah...
Now throw in battery plus equipment gets up around the 15K, and you need 115/5 = number batteries..

Thu apply to something like a displacement type hull and used as a tug boat, or a river cruise boat...not a planing hull.
 Or foil as mentioned above...???



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A number of interesting features on that boat.

Did you see the hull shape.

More importantly did you check out the trailer!?
Just cruising in my now sweetas pimped out Southern 755 HT0!
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Post Options Post Options   Likes (0) Likes(0)   Quote Catchelot Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 4:59pm
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Originally posted by MATTOO MATTOO wrote:

A number of interesting features on that boat.

Did you see the hull shape.

More importantly did you check out the trailer!?

Yes, very little wake.

50nm range at 22 knots, top speed 30 knots, no slammng into waves and it will text you if it moves (anti-theft feature) 
"The sea, once it casts its spell, holds one in its net of wonder forever." - Jacques Cousteau
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Post Options Post Options   Likes (0) Likes(0)   Quote pjc Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 5:02pm
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Its not new technology. Who didnt have a battery powered toy boat in the bathLOL
Preferred the old pop pop boat though.

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Post Options Post Options   Likes (1) Likes(1)   Quote Mr Moritz Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 5:10pm
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Originally posted by pjc pjc wrote:

Its not new technology. Who didnt have a battery powered toy boat in the bathLOL
Preferred the old pop pop boat though.


Yep, but they didn't have foils  Smile 


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Post Options Post Options   Likes (0) Likes(0)   Quote Schampy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 5:13pm
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Yeah. Looks Great.
Does not throw out bugger all wake out the back.... I doubt a wake boarder would be particularly impressed ...... and catching a cray pot buoy on ya fancy little foil could prove embarrassing .... but other than that what a bloody great Idea.
  
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Post Options Post Options   Likes (0) Likes(0)   Quote MATTOO Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 5:46pm
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All good comments.
The energy to foil will kill it if your hunting or just using your toy.
The soap bath boats were better engineered, Joke.
Would of been cool to have foils though...
At that age no concern on performance.

Just cruising in my now sweetas pimped out Southern 755 HT0!
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Post Options Post Options   Likes (1) Likes(1)   Quote Catchelot Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 7:08pm
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Originally posted by pjc pjc wrote:

Its not new technology. Who didnt have a battery powered toy boat in the bathLOL
Preferred the old pop pop boat though.


Yes but you bath toys were vibrated, not propelled! LOL
"The sea, once it casts its spell, holds one in its net of wonder forever." - Jacques Cousteau
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Post Options Post Options   Likes (0) Likes(0)   Quote Reel Deal Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 9:47pm
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batteries have improved incredibly in 24 months. Latest EV for the road can charge 80% in 46 mins and when full range 650km 

And what ever is release in old technology already. Imagine what they have in development now.

Almost scared to buy a new outboard in case it’s out dated in 5 years....
The gods do not subtract from the allotted span of men's lives the hours spent on fishing - Assyrian Proverb
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Post Options Post Options   Likes (0) Likes(0)   Quote smudge Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 11:44pm
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Originally posted by Reel Deal Reel Deal wrote:

batteries have improved incredibly in 24 months. Latest EV for the road can charge 80% in 46 mins and when full range 650km 

And what ever is release in old technology already. Imagine what they have in development now.

Almost scared to buy a new outboard in case it’s out dated in 5 years....

Yeah it has taken a long long time but electric vehicles have really become progressed. Not sure they are as green as they say but certainly they are cheaper t run and performance is incredible
Best gurnard fisherman in my street
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Post Options Post Options   Likes (0) Likes(0)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jul 2020 at 8:57am
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Lot difference between a vehicle on rolling wheels and a boat planing hull that is basically a vehicle going up a steep hill ALL the time.

What we need is after market foils for our current boats, engines.
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