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Old 30 March 2017, 17:15   #21
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Ok, what am I missing here? The new BMW i3 battery is rated at 33kwh according to my Googling.
Doesn't that translate to being able to use 44bhp for an hour then loss of power?
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Old 30 March 2017, 17:27   #22
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the lower leg is made by selva
it still uses the impeller to pump raw water around the motor and controller jacket, which is stainless steel tubing

i removed a stainless steel tank which i believe is 90litres capacity
the tank must have weighed 30kg min
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Old 30 March 2017, 18:49   #23
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I guess we will have to wait and see what the range and performance will be I'd imagine it's going to be more of a quick blast out than a long distance cruiser type of boat
A good few years ago we used to go water-skiing after work usually just 2 or 3 of us for a couple of hours which this boat might be ideal for or if you want to nip over to a local dive spot do a dive then head back
It probably wouldn't suit everyone but it may be has a place for the right owner
Look forward to seeing how it performs and what it's endurance is
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Old 31 March 2017, 15:54   #24
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Ideal as a tender also
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Old 31 March 2017, 16:40   #25
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Bear In mind that my van is 24 kw and I get around 50/60 miles
3 kw mile
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Old 31 March 2017, 20:47   #26
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Quote:
Originally Posted by Nos4r2 View Post
Ok, what am I missing here? The new BMW i3 battery is rated at 33kwh according to my Googling.
Doesn't that translate to being able to use 44bhp for an hour then loss of power?
Only the very latest i3s have a 33Kwh battery the originals had 22Kwh which are being factory swapped out - which I guess is where this battery is coming from? So I wouldn't have high hopes for this rib's range - especially if it was towing water boarders or skiers......I await with baited breath real world results.
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Old 31 March 2017, 21:45   #27
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Pretty much everything you need is on the torqueedo site.

Their own batts are 61kwh usable in a pair and with that there is a range of 10-65nm depending on the boat and throttle, a heavy rib would surely be at the low end of their chart you would think rather than a light toy they probably use for testing max ranges. The motor is most efficient at 54% throttle, might not keep the rib on plane though is downside so may end up using more throttle but that can't be helped.

Being quite a battery/electric motor geek for my other hobby it is nice to see someone doing this, look forward to the actual results.

BTW, bloody expensive this electric stuff! 18k for the engine and 13k for the small batt...gulp.
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Old 01 April 2017, 04:38   #28
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BTW, bloody expensive this electric stuff! 18k for the engine and 13k for the small batt...gulp.[/QUOTE]

Wow you can buy a decent engine and a whole lotta fuel for those numbers
Saving the planet is sure expensive

It'll be interesting to see how this works out
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Old 01 April 2017, 04:53   #29
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I have to admire the OP tbh. Ultimately this is the way that most modes of transport will go. The writing is on the wall for fossil fuels & fusion is around the corner. His experiment (cos that's what it is) will not be anywhere close to the mature technology of petrol/diesel, but they said that about steam when it started to replace sail. The Royal Navy were still insisting that the early ironclads had masts & sails "just in case" . Fair play to the OP for putting his money where his mouth is & giving it a go.
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Old 01 April 2017, 05:20   #30
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Indeed, full kudos to the guy.

Between this and the turbine rib it is nice to see out there projects.
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