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07 October 2005, 11:14
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#1
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Member
Country: UK - England
Town: Isle of Wight
Length: no boat
Join Date: Oct 2004
Posts: 154
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What power auxiliary outboard for 6.5m?
I'm planning to extend my cruising ground next year. I hope this will include The Isles of Scilly, The Channel Islands and further along the South coast. I'm based in the Solent.
I have a 2.5 hp Tohatsu that I could mount on the transom. What sort of speed would this give me in the event of a main engine failure? What auxiliary outboard hp would I need to produce 4/5 knots?
Rich
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07 October 2005, 11:21
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#2
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Member
Country: UK - England
Town: Reading, Hants
Boat name: Juicy
Make: Sealine F43
Length: 10m +
Engine: 2 x 370hp
MMSI: TBC
Join Date: Sep 2005
Posts: 2,884
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Quote:
Originally Posted by rbw156
I'm planning to extend my cruising ground next year. I hope this will include The Isles of Scilly, The Channel Islands and further along the South coast. I'm based in the Solent.
I have a 2.5 hp Tohatsu that I could mount on the transom. What sort of speed would this give me in the event of a main engine failure? What auxiliary outboard hp would I need to produce 4/5 knots?
Rich
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just based on what you see on the river i would go for a 4 or 5 hp as a 2.5 might be a real limp home and if the water is against you or the wind you might go nowhere fast
a sib dont go very fast with a 2.5 on the back so a 6.5 rib will be very interesting
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07 October 2005, 11:23
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#3
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Member
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,641
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Alderney
Has anyone crossed over to Alderney from the Solent?
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07 October 2005, 11:25
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#4
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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Yes, a few times!
Why do you ask?
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07 October 2005, 11:27
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#5
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Member
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,641
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I haven't even got my rib yet, but I would love to do that trip. A quick pint in the Divers!
--Andy
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07 October 2005, 11:29
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#6
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Member
Country: UK - England
Town: Nutbourne
Boat name: Renegade
Make: Porter
Length: 6m +
Engine: 140 Tohatsu
MMSI: 235022904
Join Date: Dec 2003
Posts: 1,195
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Andy
Have a look at
http://ribsters.proboards22.com/inde...6469165&page=1
for an ongoing account of The Jackeens and co trip this summer.
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Mark H
"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams
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07 October 2005, 11:36
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#7
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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one of our trips is fairly well documented here:
http://www.rib.net/forum/showthread....alderney+jaunt
HTH!
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07 October 2005, 11:58
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#8
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Member
Country: UK - England
Town: Isle of Wight
Length: no boat
Join Date: Oct 2004
Posts: 154
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Well, I'd certainly be up for a group trip to Alderney. There is always safety in numbers!
Rich
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07 October 2005, 12:29
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#9
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Member
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,641
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How long would it take? 3hrs?
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07 October 2005, 12:37
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#10
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Member
Country: UK - England
Town: Devon
Boat name: White Ice
Make: Ranieri
Length: 5m +
Engine: Suzuki 115hp
Join Date: Jul 2002
Posts: 5,015
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Depends how fast you go
Yep, allow three hours from Needles in good conditions. You'll end up stopping for one reason or another... change of helm, cup of tea, comfort break, hopefully not a net caught round the prop!
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07 October 2005, 12:42
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#11
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Member
Country: UK - England
Town: West Sussex
Length: no boat
Join Date: Oct 2002
Posts: 3,872
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Quote:
Originally Posted by rbw156
I'm planning to extend my cruising ground next year. I hope this will include The Isles of Scilly, The Channel Islands and further along the South coast. I'm based in the Solent.
I have a 2.5 hp Tohatsu that I could mount on the transom. What sort of speed would this give me in the event of a main engine failure? What auxiliary outboard hp would I need to produce 4/5 knots?
Rich
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When I sold Seahawk 1 (a Parker 630 diesel ) the new owner insisted on having an auxiliary engine on the transom and a 5hp outboard was fitted. The max speed was 5knots. I do not think you will get far on a 2.5 HP
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Andre
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07 October 2005, 12:49
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#12
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Member
Country: UK - England
Town: Reading, Hants
Boat name: Juicy
Make: Sealine F43
Length: 10m +
Engine: 2 x 370hp
MMSI: TBC
Join Date: Sep 2005
Posts: 2,884
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Quote:
Originally Posted by Andre
When I sold Seahawk 1 (a Parker 630 diesel ) the new owner insisted on having an auxiliary engine on the transom and a 5hp outboard was fitted. The max speed was 5knots. I do not think you will get far on a 2.5 HP
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in fact i would venture to say a 2.5 would not pull the skin off a rice pud!!
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07 October 2005, 13:06
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#13
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Member
Country: France
Town: Côte d'Azur
Boat name: Beaver Patrol
Make: Avon Searider SR4
Length: 4m +
Join Date: Jan 2004
Posts: 5,934
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1hp per meter is quite a good rule of thumb
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07 October 2005, 13:20
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#14
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Member
Country: Other
Town: Hayle, Kernow
Boat name: Spare RIB
Make: Narwhal
Length: 5m +
Engine: 130 Yam Outboard
Join Date: Mar 2005
Posts: 642
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Hi
Ive got a 8HP Tohatsu Aux on my 5.8 Mtr Narwhal when I tested it I made 6 Kts in slight seas.
Shaggy
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07 October 2005, 13:53
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#15
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Member
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,641
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Quote:
Originally Posted by Richard B
Yep, allow three hours from Needles in good conditions. You'll end up stopping for one reason or another... change of helm, cup of tea, comfort break, hopefully not a net caught round the prop!
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We have got a net caught around our prop *twice* in consecutive years, at the top of the Alderney Race!
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07 October 2005, 18:08
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#16
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Member
Country: Other
Length: 6m +
Engine: 200
Join Date: Apr 2004
Posts: 344
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easy trip really we did it again a couple of weeks ago to cherbourg and St vaas on ours andwhiteshoes on his boat 2 hours ish back three hours ish there. Alderney during the summer as per Marks link 3 hours.
not much more really than a trip around the iow 60 miles give or take.
Just make sure you have the right heading or ya might end up going in the wrong direction as happened when on board another boat
will dig out some links later.
BruceH has an aux on his solent 6 hp i think which will push him at 6 kts. Our aux is sea start and the other boats we go out with.
paul
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Joint Ribtickler 2005
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07 October 2005, 18:20
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#17
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Member
Country: Ireland
Town: Dublin & Enniscrone
Boat name: K'adó
Make: Redbay
Length: 7m +
Engine: Suzuki 300
Join Date: Oct 2004
Posts: 613
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Real Auxillary
RBW
Remember what an auxilary is going to have to do for you.
On a calm summers day you will have few worries and plenty of other boats to come to your assistance.
An auxillary is for the day you get into a spot of bother, possibly with family on board, possibly with a bit of weather and often with some miles to go from home.
Hence forget the hair dryer style auxillary and go for something that will get your boat under way in a heavy sea. Small outboards are not up to the job in anything but a flat sea.
Redbay fit 15 hp on their 6.5 m on the basis that the bigger prop is needed to get a grip in the water. Alternatively you could go for something like the high thrust yamaha 8hp which has a reduction gearbox and bigger prop to give you plenty of thrust v hp .
Probaly be a good idea to talk to users of the same size and make of boat as yourself, then borrow a few enginnes to try out which suits best. Remember to test in foul weather.
rgds
peter
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Take it easy ....but, take it all the way.
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07 October 2005, 18:23
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#18
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Member
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,641
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Quote:
Originally Posted by jackeen
Just make sure you have the right heading or ya might end up going in the wrong direction as happened when on board another boat paul
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205 ish?
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07 October 2005, 21:12
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#19
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Member
Country: UK - England
Town: SOUTHAMPTON AREA
Boat name: none
Make: bombard sib
Length: 3m +
Engine: petrol 15/3.5
Join Date: Oct 2003
Posts: 402
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I once swapped a merc 7.5hp short shaft to a merc 4hp longshaft big foot on a 22ft sailing yacht and it was just as quick with a reverse that worked to boot,I think where a boat is heavy enough not to plane with the power available,(the auxilary)its a good plan to have a prop designed for slower speeds as it grips better so maybe you can get better thrust from a more manageable size of outboard.
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07 October 2005, 21:43
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#20
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Member
Country: UK - England
Town: Towcester
Boat name: Rupert
Make: Rupert R7
Length: 7m +
Engine: Suzuki 200
Join Date: Nov 2002
Posts: 331
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1hp per m not enough
High Rich
important to have aternative propulsion.
we have 6 hp suzuki on 6.3m humber.
It was not enough when the main engine leg failed.
would now run 15hp on this size boat.
Afterall any auxilary will push you around a harbour but out at sea is different.
Paul
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