One question of outboard engine

skaraborgcraft said:
I would say the risk is as about as much as sitting inside an idling car, unless you are running an old 30-1 mix 2 stroke Seagull, they can make your eyes smart till under way to clear the smog.
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Not even close to the same risk. CO is hugely toxic gas produced by incomplete combustion.
It has no scent, is neutrally buoyant in air and our hemoglobin has a 250 times greater affinity for it than oxygen...

Besides, why are you challenging someone's likes and dislikes?
The posters dislikes are for a reason not known to you, nor are they relevant.
 
[QUOTE="BlueBell, post: 974646, member: 61928"
Besides, why are you challenging someone's likes and dislikes?
[/QUOTE]

I was pointing out that CO in the accommodation is no risk in well designed and properly vented engine compartment, which is why i used the car anology.

He can dislike outboard motor wells all he likes and for any reason he likes, including the fear of CO in the accommodation, I am just pointing out to others that his fears need not apply to everyone or to every installation.

I dont much care for schooners, no one is going to convince me to own one, but I am not offended by an alternative opinion.
 
BlueBell said:
The posters dislikes are for a reason not known to you, nor are they relevant.
Click to expand...

Read his post. His fear of CO in the accommodation. Only applicable in a bad set up, as such, relevant as it can be avoided.
 
skaraborgcraft said:
I would say the risk is as about as much as sitting inside an idling car, unless you are running an old 30-1 mix 2 stroke Seagull, they can make your eyes smart till under way to clear the smog.
Click to expand...
Very good gas to oil proportions.
 
Most of the vessels I’ve seen utilize a doghouse or some sort of enclosure. Here in Minnesota, we have Sophie’s Law after a 7 year old fell ill from CO and her Mom laid her in the cuddy where fumes were even worse from an exhaust leak. They left the cuddy door open so the Mom could listen for her which created suction for the exhaust leak to travel through the bilge. Any sleeping areas require them here after the girl died from CO while the fanily boated about the lake.

For the boat with the engine inside; I’d probably want the alarm at least.
 
It is these tragic accidents that lead to better design/regulation. A CO/smoke/gas alarm should be on all boats with cooking facilities or explosive fuels on board.
 
hashtag_laeuft said:
@Hiro Chen what is the actual purpose of your question? Is it a general conceptual thing or related to a specific design?

And I don't get the point why the engine or propulsion concept effects the CE Design Category, which covers stability and seaworthiness. Yes, the engine it self must comply to some emission regulatories, etc.

You wrote that you want to convince your boss not to use such a concept, but it also has some advantages.

For example it is way lighter than a inboard diesel engine with the same power output.

The Seascape 27 is constructed in a way that you can take out the engine, with a folding mechanism, during sailing to reduce the drag.

The engine might be more easy to maintain by a better accessebility.

Once there was an outboard engine converted to an saildrive on the market, but I guess it is not available anymore, unfortunately. You can Google for "Saildrive 330".
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Yeah, my catamaran is category A. its transom is at a sharp angle to water plane，so that it is difficult to set outboard engines normally. My boss told me we can install outboards front of transom with a likely "moonpool" structure. water sealing becomes a big problem.
upload_2025-6-23_9-42-30.jpg
 
fallguy said:
For me, the main reason I don’t like these designs is my uncertainty about what happens to fumes; especially at idle. I’d not want CO emissions inside my boat.
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it is same with me, i hate abnormal designs. I do not think somebody buyer will like these.
 
skaraborgcraft said:
In most cases the outboards are mounted in open cockpits. In some cases, like the old British Hunter yachts, the engines were in vented cockpit lockers, behind a sealed bulkhead from the accomodation.
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yes , that's why so called "outboard engine"
 
skaraborgcraft said:
It is these tragic accidents that lead to better design/regulation. A CO/smoke/gas alarm should be on all boats with cooking facilities or explosive fuels on board.
Click to expand...
in case of these, I set a separate well to install outboard, but half of the well height is under the water line. It is madding me ./
 
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