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Old 23 May 2016, 08:45   #1
Country: UK - England
Town: Bournemouth
Boat name: POLARIS
Length: 5m +
Join Date: May 2016
Posts: 1
Auxiliary outboard

What would be the minimum HP to use as an auxiliary with a 5 metre RIB to get home in an emergency ?
Bombard Sunrider 500 + Suzuki 60

sunrider500 is offline   Reply With Quote
Old 23 May 2016, 09:09   #2
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 5,428
bigger the better but you will be stuck for room along side your 60hp i had a 4hp on my 6m rib not a get you home a get you out of trouble.rule is 1 hp/m

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Old 23 May 2016, 09:14   #3
VanillaIceCream's Avatar
Country: USA
Town: Western Colorado
Boat name: Vanilla Ice Cream
Make: Zodiac
Length: 4m +
Engine: 50 Johnson Outboard
Join Date: Apr 2016
Posts: 62
I had a 6hp aux motor on a sailboat, but it would not push enough against the outgoing tide in some areas of the waterways. I would have to wait for the tide to change.

I upgraded to a 20hp aux outboard and was able to go against the tides, but still slow, the tidal current was very fast.

I would say a 9-15hp, but consider is your goal to get back to the dock or just keep off the rocks without a tow?
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Old 23 May 2016, 14:53   #4
spartacus's Avatar
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,697
Ideally 5hp would give you peace of mind. I've got a Mariner 4hp squeezed in next to my main engine on my Ribcraft 4.8m. I'm under no illusion it may not necessarily get me home if it's blowing a gale, but it gives you options.

Seamark Nunn have a Suzuki 5hp 2-stroke long shaft here:
Is that with or without VAT?
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Old 23 May 2016, 15:22   #5
Country: UK - Scotland
Town: Renfrew
Boat name: Urchin V
Make: Osprey
Length: 6m +
Engine: 150 Mercury 4 stroke
Join Date: Apr 2008
Posts: 37
I used a 3.3 tohatsu 2 stroke on my old 5.2m Zodiac, would push it along about 4knts so not ideal but light and not too bulky. I rigged up a mount for it behind one of the jockeys as there wasn't enough room on the transom. With ribs this size its always a compromise.
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