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Old 08 June 2010, 13:15   #1
Country: UK - Scotland
Town: South West Scotland
Boat name: Blue Ribbin
Make: Humber
Length: 5m +
Engine: Mariner 75
Join Date: Jan 2005
Posts: 54
Green Emergency Power

Anyone any opinions as to the usefulness of these electric outboards for an emergency/auxiliary motor?

The 55 size seems to manage several thousand pounds of boat weight that could be in my Humber Destroyer 5m ball park.

Fed up with my room taking-heavy-not transom friendly-petrolleaking Seagull “anchor”.

I can see headwinds and tide being an issue, but strictly a getting to shore facility.

I could never stand the embarrassment of calling Coastguard/Lifeboats for a main motor failure (which did happen, not the RNLI, just the engine failure – just me!

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Old 08 June 2010, 13:38   #2
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,545
You can't 'refuel' it without your engine running
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Old 09 June 2010, 03:14   #3
Country: UK - Wales
Town: Cardiff
Make: Humber Destroyer 5.5
Length: 5m +
Engine: 90hp OB
Join Date: Apr 2002
Posts: 483
I had heard that 17 lbs of thrust = 1hp, but don't quote me on it.

But I like the idea - if anyone has tried it would be great to hear their point of view.


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Old 09 June 2010, 04:14   #4
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,538
Remember that umpteen thousand lbs of "slippy" yacht or a fibreglass fishing dinghy is a vastly different drag factor to a few hundred lbs of transom dragging rib in displacement mode.

Then you need to carry enough battery power to keep it going....... Their quoted 3-4 hrs running time on an 80Ahr has the disclaimer "we presuppose you do not drive all the time on full speed." I'd check that statement out in a bit more depth for a start, because your 55Lbs thrust will be at full chat, and based on running my rib with a 4Hp petrol burner, to get more than a couple of knots, its not far off WOT.

VERY rough calcs: say 3 hrs on an 80AH, that's (80/3)*12 = 320W in 1 hr. Using a random online converter, 320W = 0.429Hp

The only "truly eco friendly" aux is a setr of oars.
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Old 09 June 2010, 06:59   #5
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Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,139
I like the idear of these too, but have always thought I would run both batteries down trying to start the main engine before swapping over to the aux.

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Old 14 June 2010, 15:23   #6
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Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,837
Surely green emergency power would be a mast and a sail

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Old 14 June 2010, 20:20   #7
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Country: Canada
Town: Vancouver, BC Canada
Boat name: Black Ops
Make: Zodiac Hurricane 733
Length: 7m +
Engine: OceanPro 150hp x 2
Join Date: Oct 2008
Posts: 246
I've got one and use it on my 10ft sib. It's ideal for that with about a 2 hour run time with a deep cycle battery.

They have decent thrust but are very slow. The prop is pitched very fine... a 2hp outboard would out run it.

Here's a video I found before my purchase...again small sib ideal, get home for a real way.

On the upside, beautifully quiet. I can pass swimming ducks, they don't even flinch.

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