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Old 08 December 2007, 13:38   #1
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Country: Belgium
Town: Ghent Belgium
Boat name: Quickflash
Make: Scorpion 9,75 m
Length: 9m +
Engine: Volvo D6 370Hp
MMSI: 20519774700
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Posts: 70
Back-up Outboard ?

What would be a good outboard engine to use as a back-up outboard incase my Scorpion 9,75m with the Volvo 370 DPR inboard diesel fails on me ? It needs to be light weight and small ( to be stored in the engine bay) but powerfull enough to bring me home if needed (at a slower pace) . I searched other threads but could not find any recent thread on this topic. I am considering the Yamaha 8 Hp 2-stroke. Any comments ? Thanks
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Old 08 December 2007, 14:06   #2
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RIBase
Sail

Probably best looking at the high thrust, long shaft, models made for sailboats. 9.9hp ish.
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Old 08 December 2007, 17:04   #3
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I use a Yamaha 15 Hp 2-stroke on a Ribeye 785, IMHO it's only just enough.

We had a rope wrap around the main engine prop in very thick fog (about 30m vis) with tide and wind pushing us onto the rocks.
It took about 20 mins to free the main prop and we had the 2 stroke running at about 3/4 top speed.
When we got home I looked at the data from the plotter. We moved very little from where our engine cut out which quite surprised me.

I would not want anything less than 15HP as a backup, and I hope I'm not caught short in anything but a moderate sea/weather.

Tim
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Old 08 December 2007, 19:59   #4
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Quote:
Originally Posted by Searider View Post
Probably best looking at the high thrust, long shaft, models made for sailboats. 9.9hp ish.
I agree - thrust at low speed is more important. I have seen old Seagulls outperform more powerful modern outboards for this very reason!!! Don't buy one though...........
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Old 08 December 2007, 20:29   #5
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Quickflash
Please bear in mind that 4 strokes do not like being stored in the engine compartment on their side. The sump oil goes where it should not be. Also, for 9.9 engine you are talking at least 90 lbs wet, if it is a 4 stroke and 60lbs. for a 2 stroke, + fuel tank You will have to haul it out and mount it on it's bracket, hook it up and start it. Somewhat difficult to do in any sort of rough conditions. If a 2 stroke you will have to change the pre-mix fuel regularly and run the engine. If were me, I would permenantly mount a 15hp
4stroke on a bracket and hook it up to portable tank so it is easy to use and check.
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Old 10 December 2007, 03:55   #6
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Quote:
Originally Posted by Quickflash View Post
What would be a good outboard engine to use as a back-up outboard incase my Scorpion 9,75m with the Volvo 370 DPR inboard diesel fails on me ? It needs to be light weight and small ( to be stored in the engine bay) but powerfull enough to bring me home if needed (at a slower pace) . I searched other threads but could not find any recent thread on this topic. I am considering the Yamaha 8 Hp 2-stroke. Any comments ? Thanks

Do you have any pics on your rib?
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Old 10 December 2007, 06:27   #7
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Do you have any pics on your rib?
Not yet, I will take delivery of the Rib in March. I am just preparing for any eventualities whilst the Rib is still in build-phase.
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Old 10 December 2007, 06:29   #8
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Country: Belgium
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Quote:
Originally Posted by Limey Linda View Post
Quickflash
Please bear in mind that 4 strokes do not like being stored in the engine compartment on their side. The sump oil goes where it should not be. Also, for 9.9 engine you are talking at least 90 lbs wet, if it is a 4 stroke and 60lbs. for a 2 stroke, + fuel tank You will have to haul it out and mount it on it's bracket, hook it up and start it. Somewhat difficult to do in any sort of rough conditions. If a 2 stroke you will have to change the pre-mix fuel regularly and run the engine. If were me, I would permenantly mount a 15hp
4stroke on a bracket and hook it up to portable tank so it is easy to use and check.
Limey Linda, good point, hadn't thought of this yet. thanks
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Old 10 December 2007, 10:11   #9
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Engine

Quickflash

When Scorpion built our boat, Graham built a engine mount in the engine compartment so the spare outboard could be stored in the correct position with fear of damage. On the stern we had a bathing platform fitted with a built in stand to take the outboard, it just bolted straight on very quickly. There was also a spare fuel tank built under the seat with a lenght of pipe set to plug straight in so it was very simple.

It would still be tricky in the rough but its something you may want to look into. We didnt have one mounted permantly as we have seen so many smashed to bits after a while.

Hope thats of some use to you

Cheers

Julian
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Old 10 December 2007, 10:27   #10
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Country: Belgium
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Boat name: Quickflash
Make: Scorpion 9,75 m
Length: 9m +
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MMSI: 20519774700
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Quote:
Originally Posted by Julian View Post
Quickflash

When Scorpion built our boat, Graham built a engine mount in the engine compartment so the spare outboard could be stored in the correct position with fear of damage. On the stern we had a bathing platform fitted with a built in stand to take the outboard, it just bolted straight on very quickly. There was also a spare fuel tank built under the seat with a lenght of pipe set to plug straight in so it was very simple.

It would still be tricky in the rough but its something you may want to look into. We didnt have one mounted permantly as we have seen so many smashed to bits after a while.

Hope thats of some use to you

Cheers

Julian
Certainly, thanks, what kind of outboard do you use and does it have sufficient HP's to do what it has to do ?
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