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Old 30 January 2018, 14:59   #91
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The best of Luck with Her!
Be interesting to how She performs with the Tech.

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Old 04 July 2018, 09:25   #92
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Keen to know how this project is going/has gone.
I've got a ski boat hull waiting for the technology to evolve a bit, and for me to get the time.
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Old 04 July 2018, 09:40   #93
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Keen to know how this project is going/has gone..
Me too. The OP is/was a field tech for Torqueedo and IMHO a delay in posting a success story is sending an concerning message. He logged in after your post, so I guess he gets an email when this thread gets a reply... Hi ERIB
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Old 09 November 2018, 08:14   #94
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A summer of electric fun

Firstly an apology for not being a little more forth coming with my report how this year and the project has gone.

I do admit to have some teething problems which took some time to resolve, mainly down to software settings, weather windows and not getting full power, as well as boost mode, which gives me an additional 20kw for some seconds to get the rib out of the hole and onto the plane.

I was also lucky to be invited to Cobra ribs for them to weigh the boat. Total weight 1300Kg. This is an issue to me as I had hoped for 1000Kg max. So I went to work putting her on a weight lose plan. helm and rear seat design changed.

When power is minimum and also stored capacity also never enough, as in my case, weight has a big effect and from previous experience 1000kg was a reasonable target, but something I did not hit. It was also clear that this rib ( some 14 years old ) and having been badly maintained was wet and heavy.

But we live a learn.

I also tried the rib with several props and found one size that gave best speed ( 23knots) 13"x 13"
One that gave best acceleration ( for wakeboarding) max speed 20knots 13" x 11"

Range, which is naturally a very big talking point and show stopper, needs some explanation. At WOT my computer calculated 7 nautical miles, which in the grand scheme of things and standard expectations gives us an indication of what 22Kw of stored electricity can do for a 1300kg planing rib with 4 persons onboard so- around 300kg of humans = total 1600kg.
Running at 75% throttle and just on the plane did increase the range but only marginally.

Now, I personally am happy with the speed, all be it not comparable to standard Cobra 6m with 115hp or up some. This rib has a 80hp outboard electric equivalent, so on the verge of being under size. But having said that for what we had intended in doing, having fun, getting out on the water, wake boarding and fishing. This boat and propulsion system works great.

In fact our limitation this summer was not weather, running costs, boat availability, is was the number of opportunities to launch her due to our family time availability.

I calculated it costs 3.70p per full recharge. A result!
This was always one session, maybe a spot of fishing, family wake board session in Christchurch bay or a complete day watching the red arrows/ fishing off Bournemouth.

I recharge her at home, so recovery was always required. Although she was invited to take a berth at Lymington yacht haven and received many interested coments and many test ride were given. There shw always recharged at the berth.... a luxury in my , now well exercised recover and launch lifestyle!

The future plans -
I have now laid her up for a period whilst I do some work to her.
First job - install new battery. The new battery will be reconstructed into a long rectangle housing, that will allow it to be mounted beneath the deck. ( Much better than before)

I was able to sell my old 22kw battery and purchase a 2017 32kw version, all for the same cost! This was a right result and means I practically got 10kw extra capacity for free. Bring on our next opportunity to get her wet again!

As a Mudeford rib user, we are naturally hopeful that one day we can get to Yarmouth, I think with present energy densities of our batteries, we can get there, but not return on one full charge.

I am also looking forward to the future as a BMW i3 42kw battery has now been released and its only a matter of time til I get my hands on one.

I also heard a rumour that BMW are already working on a 60kw and 80kw i3 battery, so it seems i'm in store for many upgrade all meaning my range will increase.

( its worth stating that even as the battery capacity increases, the size of the battery does not. The weight does increase but only fractional)

So all in all a very happy and satisfied 2018 rib user, with great things to come!

See you on the water!
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Old 09 November 2018, 09:34   #95
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I've followed this thread with mild interest and I admit a little scepticism from the off....but I must comend you're efforts and dedication to actually put something together that does a Job.

I know it's a work in progress and very probably no electric RIB will get close to the fossil fuel burners we all use (performance wise) for quite some time...but you're following in a long line of British innovators that have always pushed boundaries!...And by the sound of it having fun,spending time on the water..and learning lots in the process!
So the very best of luck for the future
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Old 09 November 2018, 09:41   #96
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thanks for the update, had been wondering how you faired

i assume you are way over the efficiency point of 54% for the motor to keep this rib on the plane?

How much range do you get at displacement speeds? Although 80hp is wasted at that speed granted but just wondering how efficient it can be.
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Old 09 November 2018, 13:33   #97
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Range, which is naturally a very big talking point and show stopper, needs some explanation. At WOT my computer calculated 7 nautical miles, Running at 75% throttle and just on the plane did increase the range but only marginally.
.
.
.
I calculated it costs 3.70p per full recharge. A result!
Am I reading those two numbers right that 7 miles costs 3.70? so 53p/mile?
I thought you would manage better than that. If petrol costs 1.28/L (I think thats what it was at the supermarket when I last looked) then you are only getting equivalent of about 0.4 L/mile, which is better than most ribs - but probably equivalent to many SIBs with the sort of top speeds you are getting.
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Old 09 November 2018, 13:44   #98
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Interesting stuff any videos?
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Old 09 November 2018, 16:22   #99
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Having been involved in the total fit out of half a dozen "hull and superstructure" projects where all the "big bits" were off the shelf I can only begin to imagine how much work went into this. But now it's time to fit a hydrogen fuel cell and do away with those batteries...
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Old 09 November 2018, 16:47   #100
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Well, I'm kinda lost for words. A very long breathless thread with numerous ups and downs. Potentially a fail for the Battery Boat Brigade or a Victory for British Ingenuity (or American Ability) - who can tell?

From my very biased and limited viewpoint, an utter waste of a doner RIB, battery, Torqueedo and whatever money when into it to produce a POS that didn't check a single box other than: 1, Astroturfed a Forum [Check]

Full marks for 'fessing up though. When the Drone Boys were giving you lessons in Capacity and you persevered, it takes big nuts to admit failure.
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